137 



Subfamily ANCYLINAE. 



ANCYLUS, Geoffroy. 



A. fuscuSj Adams. Lewis. 



A. tardus,^ ^ Say. Lewis; Robinson? Aldricli? 



A. patallelns,^ ^ Ilald. Adams (Vermont) ; Lewis ; Robinson ? 



GASTEROPO DA PECTINIBRANCHIAT A. 



(Operculata.) 



Ftimily VALVATIDAE. 



YALVATA, 0. F. Mull. 



V. tricarinata,^^ Say. Aldricli; Ingalls; Lewis; Robinson. 



V. siiiceraj Say. Ingalls ; Lewis ; Robinson. 



Family YITIPARIDAE. 



VIVIPAKA, Lamarck. 

 V. COlltectoides, W. O. Bitmcy. Colonized from Illinois (Lewis). 



Subgenus MELANTHO, Bowditch. 



M. decisilSj Say. Aldricli ; Ingalls ; Lewis ; Robinson. 



M. integer,^ ^ I>e /lay. Aldricli; Lewis; Robinson. 



M. rufuSj Ilald. Aldricli; Ingalls; Lewis. This species occurs at 



BuffalOyihowgh. not catalogued by Robinson. 



12 Two species Ancylus, not identified by Robinson, may prove to be tardus and jmraUelvs. 

 A species (not identified) noticed by Aldrich is quite likely to be Say's tardus, a species occur- 

 ring in the Mohawk River in Central New York. Aldrich's specimens were taken from that 

 river at Cohoes. 



•^ An elevated variety of this species, destitute of cariuae, luiviiij; the color and nearly tlie 

 form of F. virens, Tryon, occurs in the "Little Lakes" in the southern part of the county of 

 Herkimer ! Tryon's species is from Clear Lake, California 1 



i''This is De Kay's Pal. Integra, assuredly; but is it also Say's? There are reasons for 

 believing our shells arc simply a variety of poitderosus. Say. 



IIUL. liUl". see. NAT. SCI. (16) AITUUST, 1874. 



