140 



S. fiibalOj Prime. Wayne Co. (Aldrich) ; Herkimer Co. (Lewis). 



S. occidentillft, Prime. Brown; Ingalle; Lewis; W. W. Stewart. 



S. l)iirtiiiii('iiiin, /S«y. Hubbard; Ingalls; Robinson. 



S. traiisvcrsuin, A'«?/. Ltswis ; Robinson. 



S. SOCliro, /'m«e. Aldrich; Lewis. 



S. rosiicoiim,^^ Prime. Lewis. (Specimens named by Prime.) 



S. ci'0('(Miin,^* Lewis. Herliimer and Otsego counties (Lewis). 



S. tnincatuin, Lindey. Robinson. 



PISIDIUM, Pfeiffcr. 



P. Yirginiciim, Bourg. Aldrich; Ingalls; Lewis; Robinson. 



1*. jie((iiiljiterale, Prime. Lewis. 



1*. coinpressuui. Prime. Aldrich ; Ingalls ; Lewis. (It occurs far West.) 



1*. variabile, Prime. Ingalls ; Lewis. 



r. No vi-Eboraceiise,^ ' 7Vi/ttc. Ingalls; Lewis; Robinson. 



r. abditiimj ILild. Aldrich; Ingalls; Lewis; Robinson. 



P. ferrnj?iiiciiiii,^° Prime. Lewis. 



P. ventricosum,2i Prime. Lewis. 



Family UNIONIDAE. 



MARGARON, Lea. [In " Synopsis," 1870.] 



Subgenus UNIO> Brug. 



U. alatuSj Sa^. Aldrich; Dewey; Jewett; Robinson. 



U. anodontoides. Lea. Robinson. 



U. Boydianus, Lea. " Observations, &c." Lea. 



U. cariosixSj Say. Aldrich ; Dewey ;2 2 Ingalls ; Lewis ; Skillton. 



17 Mr. Prime refers this species to the Schuylkill River, Pa. Mr. Charles M. Wheatley, whose 

 copper works are located on the bank of that stream, says he has not been able to find this 

 species in the Schuylkill. It is such a species as one might expect would occur only in sluggish 

 ditches or stagnant water, having habits in some respects like those of 2}artumeiuTn, of which 

 species it may be only a variety. 



18 Mr. Prime puts croceum in the synonymy of secure, from which species it differs in habit, 

 occurring most abundantly anchored by a byssus in the interstices of angular gravel in the bed 

 of a stream, while secure prefers stagnant water with a soft, muddy bottom. The soft parts 

 of croceum are very yellow. 



•9 This seems to be a luxuriant development of P. variabile. 



20 P. ferrugineum seems to be a poorly developed or dwarfed form of xariaMle. 



21 The specimens of ventricosum, found in Central New York, are smaller than those found in 

 Massachusetts, and possibly larger than specimens from near Lake Superior, named rotunda- 

 tum, Pr. Being also intermediate in form they forcibly suggest the identity of rotundatum 

 with ventricosum. 



22 Dewey refers canosws to creeks nearCuffalo, May not his reference involve u. occidens. 

 Lea, instead of cariosus ? 



