256 LAND AND FRESII-WATER SHELLS OF N. A. 



Fi-. 4-o2. 



[pARr I. 



Aiiiiiial (jf 

 Suecinea rustinana. 



Animal resembling the animal of Helix, 

 but shorter. Eye -peduncles short, ex- 

 panded at their base or conoid ; tentacles 

 very short and small. Respiratory foramen 

 in the mantle, in the angle at the posterior 

 part of the aperture of the shell. 



Suecinea Iiaydeni, W. U. Binn. — Sliell elongate-oval, thin, 

 shining, amber-colored; spire short, acute; whirls three, convex, the last 

 marked with the wrinkles of growth, and irregu- 

 Fig. 453. lar, heavy, spiral furrows ; suture moderate ; 



columella covered lightly with callus, and allow- 

 ing all the interior whirls to he seen fiom helow 

 to the apex ; aperture ohlique, oval, five-sevenths 

 the length of the shell, the lower portion of its 

 margin considerablj expanded. Length 21, diani. 

 9 mill. 



Suecinea haydeni. Suecinea haydeni, W. G. BiNNEY, Proc. Aca. Nat. 



Sci. Philad. X, 114 (May, 1858) ; Terr. Moll. 



IV, 40, pi. Isxix, f. 1.— Pfeiffer, Mai. Blatt. 1859, 52.— -Blaxd, 



A\m. N. Y. Lye. VIH, 168, f. 14 (1865),— Tkyon, Am. Journ. Conch. 



II, 236, pi. ii, f. 20 (1866). 



Nebraska, between the rivers Loup Fork and L'Eau qui Court. 

 Var. minor. Length 15 mill. Found hy Mr. P.obert Kennicott near the 

 Red River of the North, and at Ft. Resolution, Great Slave Lake. 



A 



Fis. 454. 



Sueeinea retusa, Lea. — Shell ovate oblong, very thin, pellucid, 

 yellowish ; spire short ; whirls three ; aperture below dilate and drawn 

 b^ck. Diam. .3, length .7 inuli. Ohio, near Cincinnati. 



A single specimen only of this species has come into my 

 possession. It differs so much from any of the described 

 species in the dilatation and retraction of the inferior part of 

 the aperture, that I have not hesitated to consider it new. 

 {Lea.) 



Suecinea retusa, Lea, Trans. Am. Phil. Soc. V, 117, pi. xix, 

 f. '^^ (1837); Obs. I, 229.— DeKay, N. Y. Moll. 55 

 (1843).— Pfeiffek, Mod. Hel. Viv. II, 525. — Bixney, 



