[481] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 187 



MOLLUSCA. 



Gastropods. 



Page. 



Illyanassa obsoleta 479 



Nassa vibex 479 



Astyris lunata 4?9 



Anachis avara 306 



Bittium iiigrum 479 



Page. 



Littorinella rainuta 409 



Crepidula couvexa . . . . 479 



Doto coronata 480 



Elysia chlorotica 480 



Elysiella catulus 480 



Triforis nigrocinctus 305 



Lamellibranchs. 



Page. I Page. 



Argina pexata 309 I Pecten irradians 



My tilus edulis 470 j Ostrsea Yirginiana 472 



Ascidicms. 



Page. Page. 



Molgula Manbattensis 311 Botryllus Gouldii 375 



Bryozoa. 



Page. 

 Bugula turrita 311 



Vesicularia dichotoina . . 404 



Page. 



Escbarella variabilis 312 



Membranipora, liueata 406 



RADIATA. 



Acalephs. 



Page. 



Obelia diapbana 327 



Page. 



Hydractinia polyclina 328 



Obelia, sp . . 476 



Polyps. 



Page. 

 Sagartia leucolena , 329 



III. 5. ANIMALS LIVING ON OR AMONG PILES OF WHARVES, BRIDGES, 



FLOATING TIMBER, ROCKS, ETC., IN BRACKISH WATERS. 



Tbe piles of wharves in brackish harbors are often inhabited by an 

 abundance of animal life. The same species are mostly to be found also 

 on piles of wharves in the purer waters of the sounds, and many of them 

 have, therefore, already been mentioned in a previous place, (p. 378.) 

 There are some of these species, however, that appear to flourish best 

 in waters that are decidedly brackish. 



Among the most conspicuous of these is the beautiful Tubularian 

 14 v 



