590 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [88] 
Montacuta bidentata (Montagu). 
B. range, 48 fathoms.* 
Leda unca Gould. 
B. range, 14 to 48 fathoms.t 
Nucula proxima Say. 
B. range, 14 to 15 fathoms;t 48 fathoms.* 
Scapharca transversa (Say) H. & A. Adams. 
B. range, 14 to 15 fathoms.t 
Argina pexata (Say) Gray. 
B. range, 14 to 15 fathoms.t 
Pinna seminuda Lamarck. 
B. range, 14 to 48 fathoms.t 
Pecten dislocatus Say. 
B. range, 14 to 15 fathoms ;t 48 fathoms.* 
Anomia glabra Verrill. 
B. range, 15 fathoms.t 
Ostrea equestris Say. 
B. range, 14 fathoms.t 
FAUNA OF THE SURFACE WATER OF THE GULF STREAM. 
Collections of the invertebrate surface fauna were made at many 
localities during this and previous seasons in the waters of the Gulf 
Stream, both by means of hand-nets and towing nets, while porpoises 
(Delphinus delphis), sharks, and fishes of various kinds have been taken 
by the use of harpoons and hooks. By the use of muslin nets, known 
as “trawl-wings,” attached to the ends of the trawl frame, so as to be 
somewhat above the bottom, many pelagic species have been obtained 
which have not occurred in the surface nets. It is impossible, however, 
in many cases to know whether such species actually live at or near the 
bottom, at the surface, or in intermediate depths, for they are liable 
to enter these nets at any time during the descent or ascent of the 
trawl, as well as during the time that it is on the bottom. The trawl- 
wings have, however, furnished a large number of species, of various 
groups, which we have never taken im any other way, and it is probable 
that many of these live swimming free, either near the bottom or at 
various depths intermediate between the surface and bottom, where the 
temperature may best suit them. In the surface nets a great many 
eggs and young of fishes of various kinds are usually taken, the young 
fishes varying in size from those just hatched up to 2 or 3 inches 
in length. 
Copepod crustacea are usually the most abundant forms of small 
surface animals, occurring in great quantities and of many genera and 
species. Various species of the genus Calanus are the most common. 
