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In some colonial ascidians, colony specificity is manifested by fusion-incompatibility between two colonies. Some colonies fuse to form a single mass, but others do not. Since Bancroft1~ first took up this question in Botryllus, the genetic control of colony specificity has been investigated in Botryllus primigenus,2>-4) B, schlosseri,j~ and Monterey Botryllus species.°~ Recently, the presence of colony specificity was found in Perophora japonica7 ~ and P. sagamiensis8 ; in each species, two colonies of different origin do not fuse together in almost all combinations, while fragments derived from the same colony always fuse to form a single colony. However, at present, there is no information on the genetic control of the f usability of these species. Here we present a preliminary report on the fusibility of related colonies of these two species. Materials and methods. Living colonies of Perophora japonica were collected in the vicinity of the Asamushi Marine Biological Station (Aomori Prefecture) and those of P. sagamiensis from Hatakejima Island belonging to the Seto Marine Biological Laboratory (Wakayama Prefecture). These colonies were reared on glass-plates set immersed in the bay near the Shimoda Marine Research Center (Shizuoka Prefecture). During the breeding season,°~ larvae were collected from a colony of respective species. After metamorphosis, each oozooid was put on a glass-plate and allowed to grow into a large colony. The fusibility was tested by bringing the natural surfaces of two colonies in contact (see Ref. 7) in detail). The experiments were carried out at the Shimoda Marine Research Center. It is our pleasant duty to acknowledge our indebtedness to the staff for providing us facilities for carrying out the experiments. Results and discussion. When two fusible colonies of Perophora japonica come into contact, complete fusion occurs both between the tests and the blood vessels. If two colonies are nonfusible, fusion

Fusibility of related colonies in the colonial ascidian, Perophora.