156 LAND AND FRESH-WATER SHELLS OF N. A, [PART IV. 



on the penultimate ; more elevated in tlie centre, which renders these 

 whorls subangulated; lines of growth strong, by reason of which the 

 last two whorls have quite a varicose appearance. — Anthony. 



The following is the description of 



Melania intertexta. — Shell conical, acute and highly elevated ; whorls 



about ten, each strongly ribbed longitudinally and furnished also with 



revolving striae which, becoming more elevated near the 



Fig. 206. 



suture, arrest the ribs at that point; sutures decidedly im- 

 pressed ; aperture pyriform, not' large, whitish within ; colu- 

 mella slightly rounded, not indented ; sinus distinct but small. 

 Habitat. — Tennessee. 



Observations. — A very abundant species. About two hun- 

 dred specimens are now before me, and present characters 

 remarkably uniform. May be compared with 31. bella, Con- 

 rad, but differs by its more elongate, and sharply elevated form ; its 

 ribs are more decided, and it has not the bead-like prominences, so 

 common in M. bella, and kindred species. From M. arachnoidea 

 (nobis), it may be distinguished by its loss elongate but more acute 

 form, difference of aperture and less number of whorls ; the striae 

 revolve around the whorls and over the folds without being arrested 

 by them, giving the shell a woven appearance; hence its name. — 

 Anthony. 



I cannot distinguish the two species indicated by the synon- 

 ymy at the commencement of this article ; I therefore reprint 

 the descriptions in full and figure the types. The examination 

 of a great many specimens has convinced me that this shell 

 varies much in its proportions, although very distinct from the 

 other species of the genus. 



21. G. Conradi, Brot. 



Melania Conradi, Brot, List, p. 3C. 



Melania symmetrica, Conrad, Proc. Acad. Nat. Sci., iv, p. 155, Feb., 1849. Jour. 



Acad. Nat. Sci., i, pt. 4, p. 278, t. 38, f. 5, Jan., 1&50. Binney, Check List, No. 



2G0. 



Description. — Subulate, whorls nine, slightly convex, with longitu- 

 dinal, slightly curved, narrow ribs, interrupted near the suture by a 

 revolving granulated line; ribs on the body-whorl not extending as 

 far as the middle; margiu of labrum profoundly rounded; color 

 ochraceous and black. 



