FAMILY LIMNIADjE LIMNEA. 75 



(EXTRA-LIMITAL.) 



L. obrussa. (Say. Ac. Sc. 5. 123. L. decidiosa? Hald. 1. c. pi. 13, fig. 16 - 18.) Shell oblong, 

 rather slender, pale yellowish, testaceous. Whorls five, slightly rounded ; apex acute ; suture 

 deeply impressed; aperture not dilated, within pure white; columella with the sinus of the fold 

 very obvious. Length, 0*4; diameter, • 2. Philadelphia. 



L. ferruginea. (Hald. 1. c. p. 49, pi. 13, figs. 19-20.) Shell ovate-conic, thin. Whorls four, 

 convex ; suture and columellar fold distinct ; aperture oval, as long as the spire ; labium appressed, 

 ferruginous. Length • 3. Oregon. 



L. rugosa, Val. (Hald. 1. c. pi. 3, fig. 4 - 5.) Ovate-conic, thin. Whorls six, convex, with very 

 coarse accretional lines; aperture elliptic, longer than the spire; columella reflected on the last 

 whorl, so as to form a small umbilicus. Color, white, with a spiral fulvous band. Mexico. 



L. attenuala, Say. (Hald. 1. c. pi. 9, fig. 1 - 5.) Long and slender. Whorls seven, slightly con- 

 vex, revolving obliquely ; suture rather deep; apex suddenly pointed ; aperture small and semicir- 

 cular, sometimes expanded; fold on the columella well marked. Length, 1 -0. Color, wood-brown. 

 Mexico. 



L. expansa. Hald. 1. c. pi. 9, fig. 6-8. Pl. 36, fig. 348 of this work.) Short, smooth, translucent 

 and fragile. Body-whorl inflated ; spire rapidly attenuated to an acute apex, and as long as the 

 aperture. Whorls five, somewhat flattened ; suture shallow, but very distinct ; aperture effuse ; 

 columellar fold deep and distinct. Color, brownish ochre-yellow. Length, 1*0. Vermont. 



L. solida et apicina, Lea. (Hald. 1. c. pl. 11, fig. 10- 13.) Shell obtusely conical, smooth and urn- 

 bilicate. Whorls 4-5, convex ; suture deep ; apex pointed ; aperture polished, subovate ; fold 

 conspicuous only in the young. Color, pale bluish grey; aperture various shades of reddish 

 brown; young ochraceous. Length, 0-5. Oregon. 



L. bulimoides, Lea. (Hald. 1. c. pl. 13, fig. 9 - 10.) Shell short, inflated, composed of about four 

 convex whorls. Surface smooth and shining; lines of growth inconspicuous and undeviating, not 

 crossed by spiral strise ; aperture as long as the spire, level, subround and slightly produced poste- 

 riorly; labium closely appressed, except anteriorly, where it forms a small umbilicus; columella 

 without fold; spire generally much eroded; apex frequently truncated. Color, pale ochraceous, 

 sometimes with reddish varicose bands. Length, 0*5. Oregon. 



L. vitrea. (Hald. 1. c. pl. 13, figs. 14-15.) Shell ovate, extremely thin and delicate. Surface smooth 

 and polished ; lines of growth very fine ; labium with a well marked fold, and is not appressed 

 anteriorly; spire short. Length, 0-5. Ohio? Missouri. 



10* 



