SUCCINKV 7;; 



It resembles very closely some forms of Limnea. 



The identity of the shell commonly known as S. cam- 

 pestris, and S. obliqua, Say, seems to have been clearly 

 perceived by Prof. Adams, and expressed in both his 

 works quoted by us. 



3. SUCCINEA AVARA, SAY. 

 PLATE LXVII. c. FIGURE 4. 



S. testa parva, conica, pellucida, cornea, rosea, aut vires- 

 cente ; anfractibus ternis convexis ; spira. elevata, acuta ; 

 sutura valde impressa ; apertura rotundo-ovali. 



SYNONYMS AND HEFEKENCES. 



Sucdnea avara, SAY, Exped. to St. Peters, II., p. 260, pi. 15, f. 5. 



GOULD, Invertebrata, &c., p. 196, fig. 127. 



ADAMS, Shells of Vermont, p. 6. 



KIRTLAND, Loc. cit. p. 173. 



MIGHELS, Loc. cit. p. 28. 



Sucdnea vermeta, SAY, Disseminator, reprint, p. 23. 

 Sucdnea wardiana, LEA, Proceed. Am. Phil. Soc. 1841, II. 31. No. 13, p. 31. 



DESCRIPTION. 



ANIMAL. Head dark, foot flesh-colored, narrow. 



SHELL. Rather small, very thin and fragile, straw- 

 colored, rosy, amber-colored or greenish ; periostraca 

 shining, or presenting minute hairy processes in the 

 young. Whorls three, very convex, separated by a 

 deep suture ; last whorl rather large, not much expand- 

 ed ; spire very prominent, acute ; aperture ovate, round- 

 ed at both extremities, about half as long as the shell. 



Extreme length about one-fourth of an inch. 



VOL. II. 10 



