MARINE INVERTEBRATA OF GRAND MAN AN. 23 



largo number of tliis species from the under surfaces of large stones, near low-water 

 mark. It has been hitherto found, both here and in Europe, only in deep water. 



Trochus occidentalis, Migh. In 25 to 40 f , in the Hake Bay. The specimens 

 were very large and beautiful, especially when alive. The animal has four lateral 

 cirri, thus differing from other Trodd, which have three; and from Marrjarita, 

 which has five. 



Margarita cinereA, Gould. Inhabits shelly and pebbly bottoms in deep water. 



M. OBSCURA, Gould. On sandy bottoms in the huninarian zone, as off Ro.ss's 

 Island. 



M. UNDtTLATA, Sow. On weedy, rocky, and nullipore bottoms, in shallow water. 



M. ARGENTATA, Gould. Taken alive in 4 f , coarse sand, off Duck Island boat 

 moorings. 



M. helicina, Moll. Common on the marine plants which cover the rocks above 

 low-water mark. It is particularly abundant on the Long Island shore. 



M. ACUMINATA, Sow., Migh. In 40 f., on a soft muddy bottom, off the Swallow's 

 Tail. 



AnEORBis COSTULATA, St. Dead specimens were taken in 4 f , coarse sand, off 

 Nantucket Island. 



LiTTORiNA RUDis, Gould. Everywhere above low-water mark, on rocks and sea- 

 weeds. 



L. LiTTORALis, F. et H. Found with the last, and even more common. Dark 

 varieties only occur; the banded and finely-colored specimens, so commonly found 

 in Massachusetts Bay, are very rare here. 



Lacuna vincta, Turt. The variety common here is strong, broad, pale brown, 

 with one white band just under the suture. 



RissoA EBURNEA, St. In 2-j f , shell}^ bottom. 



R, ACULEUS, St. In the littoral zone ; rare. 



R. MiGFiELSii, St. In 25 f., off the northern point of Duck Island. 



R. PELAGiCA, St. Rather common in the coralline zone. 



TuRRiTELLA COSTULATA, Migh. In deep water ; rare. 



T. EROSA, Couth. Dredged in 40 f, muddy bottom, in the Hake Bay. 



T. ACicuLA, St. Dredged in 4 f., sand, off Point Franklin, and also found alive, 

 at low-water mark, under stones. 



Aporrhais occidentalis, Beck. This fine species Avas dredged alive, for the 

 first time, on a gravelly bottom in 35 f., to the north-east of the Island. Among 

 the living specimens were both young and adult, the animals of which I have 

 figured and described in my notes. They confirm the conjectures with regard to 

 the proper genus to which it belongs, which have been founded on the shell alone ; 

 for the animal agrees in all important particulars with that of A. pcspeUcani of 

 Europe. 



ScALARiA Gronlandica, Gould. On pebbly and shelly bottoms, in from 10 to GO 

 fathoms. 



Mexlstiio albula, Moll. Dredged frequently alive on sandy bottoms, in tlie 

 laminarian and coralline zones. 



CuEMNiTZiA NIVEA, St. Frequent in 35 fathoms, in the Hake Bay. 



