137 



Subfaniily ANCYLINAE. 



ANCYLUS, Gcoffroy. 



A. fiisciiSj Adams. Lewis. 



A. tanlns,^^ tiay. Lewis; llobinsou ? Aldrich? 



A. patallelus,!- Uald. Adams (Vermont); Lewis; Robinson? 



GASTEROPODA PECTINIBEANCIIIATA. 

 (Operculata.) 



Family VALYATIDAE. 



YALYATA, 0. F. Mull. 



Y. ti'icariuata,^^ Say. Aldricli ; Ingalls; Lewis; Robinson. 



Y. sincera, *S'(/^. lugalls; Lewis; Robinson. 



Family TIYIPARIDAE. 



YIYIPAKA, Lamarck. 

 Y. COiitectoides, W. G. Binncy. Colonized from Illinois (Lewis). 



Subgenus MELANTHO, Bowditch. 



M. (Iccisns, Say. Aldricli ; Ingalls ; Lewis ; Robinson. 



M. intei?ci',^* Z)e/iffy. Aldricli; Lewis; Robinson. 



M. rilfus^ Ilald. Aldricli; lugalls; Lewis. This species occurs at 



Buffalo, ihongh. not catalogued by Robinson. 



'2 Two species Ancijlus, not identified iiy Rol)inson, may prove to be tardus and imraUelus. 

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

 ring in tlie Mohawk River in Central New Yorlj. Aldriclfs specimens were taken from that 

 river at Cohoes. 



1^ An elevated variety of this species, destitute of carinae, having the color and nearly the 

 form of r. firens, Tryon, occurs in the " Little Lakes"' in the southern part of llio county of 

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



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

 believing our shells are simply a variety iii' jfonderosus. Say. 



liUL. liVl\ SOC. NAT. SCI. (IS) AUGUST, 1874. 



