36 HELICEA. 



Succinea avara DE KAY, N. Y. Moll. p. 54, pi. iv. fig. 55. 



CHEMNITZ, ed. 2, p. 51, pi. v. fig. 18-20, (1854). 

 Succinea Wardiana PFEIFFER, Mon. Hel. Viv. ii. p. 525; iii. p. 15. 

 LEA, Tr. Am. Phil. Soc. ix. p. 3, (1844). 



Pfeiffer (1. c.) gives Lea's description of S. Wardiana, 

 marking the species as one he had not seen. 



Specimens which are apparently referable to S. avara 

 have been found at Alexandria, La. (Coll. Lea), and at 

 St. Simon's Isle, Ga. (Postell). 



I have found this species under logs, at great distances 

 from any water. In this respect its habits differ from 

 those of the other Succinece of America. 



In my Notes, No. 4, 1 have catalogued Succinea vermeta 

 separately. I am not at all convinced of its identity with 

 this species. I have never seen any specimen answering 

 Say's description of the suture. It seems best, however, 

 to leave S. vermeta in the synonymy of S. avara, where it 

 has been placed by Binney, Gould, Adams, De Kay, and 

 Pfeiffer. The original description is given below. 



It is very certain that the large variety of S. avara is 

 not S. vermeta, though usually known by that name. It 

 sometimes reaches the length of 13 millimetres. I have 

 it from Ohio, Utica, N. Y. (Jewett), and Mohawk, N. Y. 

 (Lewis). 



Say's original specimens of S. avara are preserved in 

 the Philadelphia Academy. 



SUCCINEA VERMETA (Binney's ed. p. 38). Shell suboval, yellowish, 

 very thin and fragile, somewhat diaphanous, with nearly three very ob- 

 lique volutions ; whorls very much rounded-, wrinkled ; suture very pro- 

 foundly impressed ; spire rather prominent and acute ; aperture ovate, 

 the superior termination rounded. 



Inhabits margins of ponds near New Harmony. 



This species is remarkable for the very deep indentation of its suture, 

 giving to the whorls of the spire the appearance of being almost sepa- 

 rated from resting on each other ; and by this character it may be readily 

 distinguished from the other species of this country. It was found by Dr. 

 Troost. (Say). 



