86 THE NAUTILUS. 



what resembled Lyogyrus granum, with which I had become 

 famiHar in the Delaware River tidal marshes, living upon water- 

 plants of the same group. Suspecting it might be of some 

 interest, it was submitted to Mr. E. G. Vanatta, and though the 

 shell was deformed, he pronounced it to be Paludestrina salsa 

 Pilsbry. 



As this formed a rather considerable southerly extension of 

 range of this little-known shell, a more satisfactory basis for the 

 new record was established August 5, 1915, when a good series 

 was obtained. The snail proved to be much more common 

 upon floating algal vegetation than upon the Rvppia, and the 

 amount of material obtained depended only upon the quantity 

 of algae picked over. This appears to be a thriving colony as 

 individuals in all stages of development were equally common. 

 Some slight variation seems to occur, as seen in mature examples, 

 but this is apparently no greater, nor of any more significance, 

 than previously noted in this species.' 



The pond-hole where this colony of Paludestrina salsa occurs 

 is rather unique among the physical features of Long Beach. 

 Most of the pieces of brackish water on the salt marshes here 

 are merely shallow, muddy depressions of irregular outline, but 

 the present one is a deep round pool of no great area with pre- 

 cipitous sides. If it occurred in rocky country it would probably 

 be referred to as a pot-hole or a sink-hole. 



In looking up the literature of the described localities where 

 this snail has been observed, I find in the interesting accounts 

 which Rev. H. W. Winkley gives of the various habitats known 

 to him, that there are references which very closely suggest the 

 Long Beach station. In Branford, Connecticut, the snail is de- 

 scribed as abundant on vegetable matter floating in a ditch in 

 the brackish marsh (to combine information from two notes).* 

 In the later paper there is also reference to the station in 

 Wareham, Massachusetts where a colony occurs " in a pot hole 

 in the marsh." I have no doubt that in physical features the 

 Long Beach locality much resembles the one in Wareham. If 



'Winkley, Nautilus, xix, 107 (1906). 



» Winkley, Nautilus, xix, 107 (1906) and xiii. 53 (1908). 



