150 On the Mollusca of Long Island. 



found in a fresh state both in the spring and autumn. The 

 state of development was not particularly noted in spring (in 

 April), but as far as my recollection goes, it did not differ 

 materially from that of specimens taken early in November, 

 an4 was far less advanced than in those collected about the 1st 

 of Feb., appearing to indicate that the animal spawns twice a 

 year. In spawn of the two species, taken at the same time and 

 in the same locality, about the 6th of November, this species 

 was only about one-tenth of an inch long, whilst P. canalicu- 

 lata was of twice that length, and much more developed. A 

 corresponding difference was to be seen in specimens obtained 

 about Feb. 1st, though their respective sizes were then more 

 than doubled. The membranous cases, containing the ova, 

 are, in this species, sharp-edged, and marked with about a 

 dozen radiating ridges on the sides ; whilst P. canaliculata has 

 the sides smooth and parallel, connected by a membrane an 

 eighth of an inch wide, crossed by twelve or fifteen ribs. The 

 lingual ribbons of both species are nearly three inches long ; 

 containing, in this species, about 130 rows of teeth. Low water 

 to 10 faths. At the latter depth I have never dredged it more 

 than half an inch long alive. 



4. Pyrula canaliculata Brug. Abundant and generally • 

 larger than Dekay and Gould state. Seven inches is a common 

 length, and I have found them considerably larger. I have 

 never found it here in water more than a few feet deep. 



5. Buccinum pUcosum Menke. Moderately abundant and 

 large. High water to 10 faths. 



6. Nassa obsoleta Say. Yery abundant. Littoral. 



7. JVassa ti'ivittata Say. Abundant. The three bands of 

 color are generally present. Specimens from the mouth of 

 Napeague Harbor, which is, however, a little beyond the strict 

 limits of Gardiner's Bay, and exposed to a somewhat heavier 

 surf, are almost invariably highly colored and conspicuously 

 banded. I have a dead specimen from here nearly an inch 

 long. The animal is much lighter colored than that of the i^re- 



