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During July 1979, two adult specimens belonging to the cephalocaridan genus Lightiellu Jones, 1961 were collected in a box core sample taken at the mouth of Mobile Bay, Alabama. These two specimens were compared to the four described species of Lightiella, and found to be most similar to the northeastern Atlantic species of L. incisa Gooding, 1963 and L. floridam McLaughlin, 1976. Due to a combination of differences in the thoracopodal setation and incisor process of the mandible, the Mobile Bay form cannot at this time be assigned to any of the described species of Lightielk. The two Mobile Bay specimens may represent an undescribed species or an ecophenotypic variant of L. incisa, but until more specimens from Mobile Bay and adjacent waters are available for study, no conclusions can be made on specific identity of this form. Interpretive problems concerning morphological characters of the Mobile Bay specimens and previously described species of Lightielk are briefly discussed. The subclass Cephalocarida Sanders, 1955, contains four genera represented by nine species known from marine habitats scattered throughout the world (Hessler and Sanders 1973, McLaughlin 1976, Knox and Fenwick 1977). Of the four genera, Lightiella Jones, 1961, is the largest with four species, followed by Sandersiella Shiino, 1965, with three species. The type genus for the subclass Hutchinsoniella Sanders, 1955, and the most recently described genus, Chiltoniella Knox and Fenwick, 1977, are both monotypic. The species of Lightiella occur in both the Atlantic and Pacific Oceans. Lightiella incisa Gooding, 1963, and L. jloridana McLaughlin, 1976 are northwestern Atlantic forms known from the Caribbean and eastern Gulf of Mexico (Gooding 1963, Sanders and Hessler 1964,McLaughlin 1976,Saloman 1978, Stoner 1981). The other two species, L. serendipita Jones, 1961, and L. monniotae Cals and Delamare Deboutteville, 1970, were described from the Pacific, San Francisco Bay, and New Caledonia, respectively (Jones 1961, Cals and Delamare Deboutteville 1970). The two specimens of Lightiella on which this report is based were collected on 6 July 1979 from a tidal pass at the mouth (south end) of Mobile Bay, Alabama, 2.5 km east of Fort Gaines (30"15'13"N. 88'3'8''W.) from 5.0 m in depth. Hydrographic measurements at time of collection included temperature (29.7"C), salinity (26.9"/,& and D.O. (4.5 ppm). The benthic community at this site represents a transitional fauna between that of coarse sands and fine sand-silt-clay substrata. Sediments characteristic of this station are moderately sorted (medium well sorted to coarse) sands with moderate amounts (10-15%) of silt and clay. The dominant polychaete species at this site were Magelona cf. cincta Ehlers, 1908, and Malacoceros vanderhorsti 'Present address: 4008 Cottage Hill Road, Mobile, Alabama 36609 Manuscript received April 28, 1982; accepted August 25, 1982. (Augener, 1927) with seasonal peaks in Mediomastus spp., Myriochele oculata Zars, 1923, and the archiannelid Pog a single 2.1-mm specimen from the type locality (Anclote Anchorage) and two specimens (2.4 and 2.6 mm) from the Apalachee Bay series reported by Stoner (1 98 1) were made available to us for study. Our specimens of Lightiella from Mobile Bay superficially both appear to be adults measuring 2.7 and 2.9 mm in length and were slightly damaged (some pseudepipods and expodites of the posterior thoracopods and the long terminal setae of caudal rami were missing). The smaller specimen was dissected and the larger one was left intact in a temporary glycerin slide mount. The dissected remains of the smaller specimen are in the collection of the senior author; the larger specimen has been deposited in the Gulf Coast Research Laboratory Museum, Ocean Springs, Mississippi. The Mobile Bay specimens appear to be most closely related to L. incisa, but also share some characters of L. Jloridana. A comparison of the four described species of Lightiella and the Mobile Bay form, with nine different morphological characters, is presented in Table 1. Lightiella sp. (Mobile Bay) differs from L. floridana, the only cephalocaridan previously known from the Gulf of Mexico, by having (1) an incisor process on the mandible with large

The Occurrence of Lightiella Jones, 1961 (Crustacea: Cephalocarida) in Mobile Bay, Alabama