Cirripedes from the Cenomanian Chalk Marl of Cambridge.

Through the industry of the late Mr. F. Mockler, I have been enabled to examine a large series of Cirripede remains Avhich he obtained from the Cenoraanian Chalk Marl in the neighbourhood of Cambridge. By far the greater number can be referred to two species, which add materially to our knowledge of the phylogeny of the pedunculate Cirripedes. One, Zeugmatolepas moclderi, gen. et sp. n., is represented by two nearly complete capitula and portions of nine others, as well as a large number of isolated valves. It is interesting from the fact that, while it agrees withthe species of PoUicij:)es in the number of valves of the cajaitulum, it differs not onl}' in the more specialized form of scutum, but also in the size and position of the upper latera, which are nearly as large as the scuta, and have become elevated to occupy the whole of the space between the scuta and terga. This form ceitainly serves more than any other to connect the genus FoUicipes to ScalpeUum, and, together with S. (?) cretm Steenstrup sp., from the Upper Senonian of Denmark, is now included in the new genus Zeugmatolepas. The second species, ScalpeUum tuberculatttm Darwin, is represented by a large number of separated valves, including several not previously known. These enable us not only to reconsti-uct the capitulum, but also to show that the species must be referred to the genus Calantica Gray. Representatives of that genus are now found living, and the geologically oldest species of its subgenus Scillcelepas, to which Scalpelhim tuberculatum comes nearest, occurs in the Miocene of Italy. The recent and Tertiary species have the umbones of all the valves apical, so that it is surprising to find in the Cretaceous I'epresentative,