15 



HELICINA OCCULT. 



Carinated; carina almost concealed on the spire and nearly 

 obsolete on the body whorl. 



(H. occulta. Nob. Trans. Jour a. ofMzdicine, Vol. 4, p. 5'2d.) 

 Whorls about five, carinate, or with an acute shoulder which 

 is almost concealed on the spire by the suture; it becomes 

 more obtuse and almost obsolete, or even impressed, on the 

 body whorl, but near the labrum it is again very obvious: the 

 whole surface has slightly elevated, somewhat regular lines, 

 forming grooves between them, across the whorls, and there 

 is an appearance of revolving lines on the body whorl, par- 

 ticularly beneath: labrum entire, thick, a little reflected, ob- 

 tusely a little more prominent towards the base, but not angu- 

 lated. 



All the specimens that I have found are dead and bleached. 

 They occur abundantly in the rugged and abrupt "bluff," half 

 a mile below New Harmony, near the river bank, with many 

 Helices, that are commonly found in the Western States. 

 They are much the same size, or even a little larger than the 

 Helicina orbiculata, Nob.; which species is destitute of carina 

 and of prominent wrinkles or elevated lines, its labrum is re- 

 flected, but not thickened, with a distinct angle near its base. 



M ELAN I A, Brug. 



M. pluristriata. Turreted; with numerous transverse, ele- 

 vated lines. 



Inhabits Mexico. 



Shell oblong-conic, tapering, more or less tinged with rufous: 

 whorls eight or ten, without much convexity, with elevated, 

 numerous, revolving lines, about fifteen on the body whorl and 

 five on those of the spire: suture of the spire impressed, often 

 indistinct; of the body whorl very deeply indented ; ap i with 

 a small truncation: labrum, near the base, not remarkably 

 produced: base without any rudiment of a sinus: body whorl 

 slightly ventricose. 



Length, one inch and one-fourth. Greatest breadth, eli ven- 

 twentieths. 



It was sent to me from Mexico by Mr. Win. Maclure. It 

 may be distinguished from multilineata, Say, b) its superior 

 magnitude, greater elevation of the striae, less prominence of 



the labrum near the base, tScc. 



