IIELICINA. 



109 



the peritreme at nearly a right angle, and forming thereby a denticular 

 protruberauce ; base delicately enamelled. Diameter 9, height 6 mill. 



Helicina {Olj^gi/ra) orbiculuta, Say, Journ. Phila. Ac. I, 283; Nich. 

 Encycl. ed. 3 ; Am. Conch. 5, pi. xlvi, f. 1-3 ; ed. Binney, 36, pi. 

 xlvi, f. 1-3 ; ed. Chend, Bibl. Conch. Ill, 58, pi. xv, f. 2, 2 a, 2 c— 

 Gray, Zool. Journ. I, 70.— Binney, T. Moll. II, 352, pi. ixxiii, ixxiv, 

 f. 3.— DeKay, N. Y. Moll. 82 (1843).— Chemnitz, ed. 2, 74 (1846), 

 pi. X, f. 32, 33.— Pfeiffek, Mon. I'ueum. Viv. I, 375 ; II, 199 (excl. 

 H. rubella). — Gray & Pfeiffek, Brit. Mus. Phan. 272 (not of Sow- 

 ERBY).— W. G. Binney, T. M. IV, 193, pi. Ixxv, f. lS-20. 



Helicina, tropica, Jan in Cuemnitz, ed. 2, p. 37, pi. iv, f. 9, 10. — Pfeiffek, 

 Mon. Pueum. Viv. I, 375 ; II, 199.— Gray & Pfeiffek, Brit. Mus. 

 Phan. p. 271.— W. G. Binney, T. M. IV, 194.— Troschel, Gebiss d. 

 Schn. p. 81, pi. V, f. 9. 



Helicina ambeiiana, Sowerby, Thes. Tab. 8, pi. i, f. 19 (1842), not RoisgY. 



Helicina castanea, Sowerby, /. c, 13, pi. i, f. 31, 32. 



Helicina vesttta, Guilding in Sowb., /. c, p. 14, pi. i, f. 42. 



Helicina minuta? Sowerby, L c, f. 40, 41. 



Texas to Georgia ; Tennessee to Florida. Also in tlie post- 

 pleioceue of the Mississippi Valley. 



Animal (see Fig. 214) : Head and tentacles black, the other 

 parts of the body dark. Tentacles long and slender, tapering to 

 a point. Eyes black and prominent. Motion gliding as in Helix. 

 Operculum horny, turning back upon the columella as if upon a 

 hinge. 



This species seems to be distributed over a very wide extent 

 of territory, and also to be subject to great variations in size and 

 coloring. From specimens collected in company, within a very 

 small area, individuals might be selected differing so widely from 

 each other that no one would hesitate to regard them as very 

 different species, unless their history were known. 



Locality. 



From whom received. 



Texas. 



St. Simoa's Island, Ga. 



Texas. 



Indianola, Tex. 

 Tamaulipas, Mex. 



Texas. 



Hot Spr., Ark. 



G. Wurdemanu. 



Dr. .T. Lewis. 

 W. G. Binney. 

 Lieut. Couch. 



Lieut. Couch. 



W. G. Binney. 



Dr. B. Powell. 



Cabinet series. 

 {H. tropica.) 



Cab. sec, 



