INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 481 



MOLLUSCA. 



Gastropods. 



Page. 



Illyanassa obsoleta 470 



Nassa vibex 479 



Astyris lunata 479 



Aiiachis avara 306 



Bittium nigrum 479 



Tiiforis niorociuctus 305 



Page. 



Littorinella minnta 409 



Ciepidula convexa 479 



Doto coronata 480 



Elysia chlorotica 480 



Elysiella catulus 480 



LamelUhranchs. 



Page. 



Argina pexata 309 



Mvtilus edulis 470 



Pecten irradians 



Ostr?ea Virginiaua 



Page. 



Ascidians. 



Page. 

 Molgula Manbatteusis 311 



361 

 472 



Page. 



Botryllus Gouldii 375 



Bryozoa. 



Page. 

 Bugiila turrita 311 



Vesiciilai ia dichotoma 404 



Page. 



Escbarella variabilis 312 



Membranipora, lineata 406 



RADIATA. 



Acalephs. 



Page. 



Obelia diaphaua 327 



Obelia, sp 476 



Hydractinia polycliua . 



Page. 

 328 



Polyps. 



Sagartia lencoleua 



Page. 



32*) 



III. 5. — Animals living on or among piles of wharves, BRit)GL^, 



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



The 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 wharv-es 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 



S. Mis. 61- 



-31 



