[459] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 165 



List of external parasites observed on fishes and oilier marine animals of 

 Southern New England. 



In the following list I have included all the determined species ob 

 served in these waters, whether living in the sounds, or in the outer 

 waters, or in the brackish waters of the estuaries, for most of these par 

 asitic species are capable of living in as diverse conditions as do the ani 

 mals which they infest, and most of the fishes pass from time to time into 

 each of the divisions named, though some, like the cod, are chiefly found 

 in the colder outer waters, and even there only in winter. 



The list is undoubtedly very incomplete for it is based chiefly on col 

 lections made during two seasons, and mainly in the summer months. 

 In addition to the true parasites I have, for greater convenience, in 

 cluded in the list some that merely live on or with other animals, 

 either for the sake of shelter, or to feed upon their excretions, or to 

 share their food. Some of these would be properly classed as &quot; commen 

 sals. 7 



ARTICULATA. 



Crustacea. 



Pinnotheres ostreum, (p. 367,) in oysters. 



P. maculatus, in Mytilus edulis. 



Laphy stiiis sturionis, on goose-fish and skate, (457.) 



Hyperia, species, on jelly-fishes, (439.) 



Nerocila munda, on file-fish. 



Conilera concharum. 



Livoneca ovalis, on blue-fish, (457.) 



Cepon distortus, in branchial cavity of Gelasiinus, (457.) 



Ergasilus labraces, on striped-bass. 



Argulus catostomi, on the sucker, (Catostomus.) 



A. laticauda, (457.) 



A. latus. 



A. megalops. 



A. alosai, on &quot; alewives.&quot; 



Caligus curtus, on cod-fish. 



C. rapax, on sting-ray, (Trygon hastata.) 



Lepeophtheirus, sp., on sting-ray. 



Lepeophtheirus, sp., on flounder, (Ohsenopsetta ocellaris.) 



Echthrogalus coleoptratus, on mackerel- shark, (Larnua punetata.) 



E. deriticulatus, on Atwood s shark, (Carcharodou Atwoodi.) 



Pandarus Grauchii, (?) on dusky shark, (Platypodon obscurus.) 



Pandarus, sp., on Atwood s shark, (Carcharodon Atwoodi.) 



Xogagus Latreillii, on Atwood s shark, (457.) 



N. tenax, on Atwood s shark, (457.) 



Pandarus sinuatus, on the &quot; dog-fish,&quot; (Mustelus canis.) 



Cecrops Latreillii, on Othagoriscus rnola. 



