INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 331 



a few species of marine insects that are frequently met with under 

 stones, or among the small green algge. Among these a small lead-col- 

 ored insect belonging to the family of '' spring-tails," Aninida maritma jis 

 the most abundant. With it a spider, Bdella^ and several species of mites 

 [Troiiibidium) are often found. ScTeral specimens of a "false scorpion, " 

 Cliernes ohiongus, were also found by Mr. Smith near low-water mark 

 under stones. In the pools and on the rocks, among the green confervie 

 and other sea- weeds, the active green larvoe of a two-winged fly, Chiron- 

 oimis oceanicuSj is often found in abundance. This larva we have detected 

 in the stomach of the " tom-cod," mixed with small Crustacea. 



List of species inlidbiting the roclxy shores of the sounds and oays. 



In the following list the species living in these situations are brought 

 together systematically, whether mentioned in the preceding pages or 

 not. The lists are not to be regarded as complete, but include most 

 of the species ordinarily met with. The references are to the pages of 

 this report, where remarks upon the species may be found : 



ARTICULATA. 



Insects. 



Page. 



Chironomus oceanicus 331 



Anurida maritima 331 



Chernes oblongus 331 



Page. 



Bdella marina 331 



Trombidium, several species 331 



Crustacea. 



Page. 



Cancer irroratus 312 



Panopeus depressus 312 



P. Sayi 312 



P. Harrisii 313 



Carcinus granulatus 312 



Eupagurus poUicaris 313 



E. longicarpus 313 



Homarus Americanus 313 



Orchestia agilis 314 



Hyale littoralis 315 



Calliopius laeviusculus 315 



Gammarus ornatus 314 



G. annulatus 314 



G. jMarinus 314 



Page. 



Moera levis 315 



Melita nitida 314 



Amphithoe maculata , 315 



A. valida 315 



Caprella, sp 316 



Sphaeroma quadridentata . . 315 



Idotea irrorata 316 



I. phosphorea 316 



Erichsonia filiformis 316 



Epelys montosus 



Jsera copiosa 315 



Balanus balanoides 304 



Numerous small Entomos- 

 traca. 



