On the Mollusca of Long Island. 14:9 



occurs sometimes in very large masses. In June or July, 1858, 

 I saw on the beacli near Soutliold, in Peconic Bay, a heap 

 eighteen inches or two feet in diameter, which must have been 

 the product of a large number of individuals. Other smaller 

 heaps were to be seen around. I have never seen'the species 

 so abundant as on the day that this was observed. More than 

 a thousand, some of the largest size, were lying within a very 

 small space, having been drawn up in a seine. They appear 

 to prey upon each other, as I have found the jaws and eyes of 

 small ones in the stomach of a larger individual. Another had 

 several fragments of eelgrass {Zostera marina) in its stomach. 

 The lingual ribbon is about half an inch long in individuals of 

 the ordinary size. 



Prosobraaicloata. 



2. Manella caudata Say. Moderately abundant. On sandy 

 and pebbly bottoms— to 4 to 10 fathoms. Generally smaller 

 than Gould states, in the Bay, but those from the Sound are 

 frequently an inch long. The animal has the lower surface of 

 the foot yellowish white ; upper surface translucent yellowish 

 white, thickly mottled with opaque yellow. Foot square in 

 front and obtusely pointed behind : about three-eighths the 

 length of the shell. Upper surface of the body, as well as the 

 tentacles, translucent white, thickly mottled with opaque white. 

 Tentacles short and thick, bearing the black eyes on their outer 

 sides at about three-fourths their length, and diminishing sud- 

 denly in thickness beyond them. This description is principally 

 drawn from a single specimen, for though I have kept many of 

 them alive, and sometimes for a week or two at a time, I have 

 very rarely succeeded in seeing any part of the animal but the 

 bottom and edge of the foot. 



3. Pyrula carica Brug. Abundant and large. Seven 

 inches is a common length, and I have seen it eight inches 

 long. The spawn of this, as well as of the following species, is 



