INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 331 



;i few species of marine insects that are frequently met with under 

 stoneSj or among the small green algre. Among these a small lead-col- 

 ored insect belonging to the family of " spring-tails," Annrida mariUma, is 

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

 {TromhUUum) are often found. Several specimens of a "false scorpion, " 

 Chernes ohlongus, were also found by Mr. Smith near low-water mark 

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

 and other sea-weeds, the active green larva3 of a two-winged fly, CMron- 

 omiis 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 inhabiting the rocl'y shores of tlie sounds and hays. 



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 



Bdella marina 



Trombidium, several species 



Page. 

 331 

 331 



Crustacea. 



Page. 



Cancer irroratus 312 



Pauopeus 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 Iseviusculus 315 



Gammarus ornatus 314 



Gr. annulatns 314 



G. ]\[arinus 314 



Moera levis 



Melita nitida 



Amphithoe maculata , 



A. valida 



Caprella, sp 



Sphperoma quadridentata . . 



Idotea irrorata 



I. phosphorea 



Erichsonia filiformis 



Epelys montosus 



Jiiera copiosa . . 



Balanus balanoides 



Numerous small Entomos- 

 traca. 



Page. 

 315 

 314 

 315 

 315 

 316 

 315 

 316 

 316 

 316 



315 

 304 



