INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 195 



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Alcyonidiuin liirsutum 487 



A. hispidum 487 



Yesicularia gracilis 380 



Y. cuscuta 404 



Y. fusca 420 



Farrella familiaris 487 



Tubulipora fkibellaris 405 



Crisia eburnea.. ... 311 



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Bngula flabellata. , ,",ll 



Mnnbranipora pilosa 406 



M. lineata /KM; 



Escharella variabilis 312 



Discopora coccinea .... 333 



Lepralia, sp 420 



Cellepora ramulosa 312 



Pedicelliha Americana.. 405 



RADIATA. 



EcMnoderms. 



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Strougylocentrotus Drobachi- 

 eusis . . 49G 



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 Asterias vulgaris , 496 



Cribrella sanguinolenta. . 407 



Acaleplis. 



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Obelia pyriformis 390 



O. geniculata 487 



O. flabellata 390 



O. diaphana 327 



Campanularia flexuosa 327 



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Sertularia pumila 487 



S. argentea 408 



Perm aria tiarella 327 



Olava leptostyla 328 



Hydractinia polyclina 228 



Polyps. 



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I 



Metridium marginatuin 329 Sagartia leucolena 329 



IY. 2. SPECIES INHABITING THE SANDY SHORES OF THE OPEN COAST. 



Owing to the force of the waves the sand and gravel of the exposed 

 shores are kept in constant motion in stormy weather, and are often dis- 

 turbed to a considerable depth, especially in winter. Therefore the con- 

 ditions are very unfavorable for the existence of animal life. The fauna 

 of such shores is, accordingly, very meager, as compared with that of 

 the more sheltered sandy shores of the bays and sounds. 



It often happens that one may examine these sandy beaches fora mile 

 or more at low-water without finding more than half a dozen species of 

 animals that actually live on them, though many may be found thrown 

 up by the waves from below low- water mark. 



In coves or other localities that are somewhat sheltered, the number of 

 species is greater, and most of them are identical with those found on 

 the sandy shores of the sounds. 



Toward high-water mark the Talorcliestia longlcornis (p. 33G) and T. 



