﻿384 DESCRIPTIONS OF NEW SPECIES OF 



NEVERITA, Risso. 



N.'arata. PI. 67, fig. 35. Subglobose, oblique, approaching Sigaretus in the angle 

 of the body whorl ; whorls five, very much enveloped, spire low, suture indistinct; 

 mouth ovate, outer lip very thin, inner lip thick, with a slight emargination between 

 the inner and outer lip at the posterior angle ; umbilicus large, nearly filled by the 

 callosity on which exists sometimes two, sometimes three deep, transverse grooves, 

 surface smooth, polished. 



Common from both localities. 



Dimensions. — Height *18 in., greatest diameter of mouth "25 in., width of body whorl 

 •31 in. 



LUNATIA. 



L. Moorei. PI. 67, fig. 34. Thin, subglobose; whorls three, flattened above, spire 

 low ; mouth "ovate, outer lip plain, arcuate, inner lip and columella very thin ; um- 

 bilicus closed, callus very small, almost rudimentary ; surface smooth. 



Dimensions. — Height *15 in., length of mouth *12 in., width of body whorl *13 in. 



Locality. — Caldwell County. My collection. Rare. 



MONOPTYGMA, Lea. 



— < M. crassiplica, Con., MSS. PI. 67, fig. 37. Fusiform, moderately thick, aperture 

 rather narrow; fold on the columella thick and elevated. 



Dimensions. — Length 1 in., width of body whorl -5 in., length of mouth *55 in. 



Locality. — Wheelock, Texas. 



" It is interesting to find a second species of this genus with a more prominent fold 

 than the typical shell. It confirms the propriety of separating the species from those 

 of Ancilla, and the genus Monoptygma may now be regarded as of Eocene origin 

 and probably does not occur in the upper tertiaries." — Conrad, MSS. 



ARCHITECTONIC A, Bolton, 1698. Solarium, Lam., 1799. 



A. Texana. PI. 67, fig. 38. Subconical, whorls five or six, smooth, spire low ; mouth 

 rhomboidal ; umbilicus wide and bordered on the edge by a single row of tubercles ; 

 body whorl has a sharp carina on the margin ; surface above smooth ; suture almost 

 obliterated, surface below, and in the umbilicus, striate across the whorl. 



Dimensions. — Height *3 in., diameter of disc '6 in. 



- 1 A. vespertina. PI. 67, fig 39. Subconical ; whorls four, carinated ; spire low ; mouth 

 rhomboidal, umbilicus wide; suture linear and faintly undulating; surface above 

 marked by numerous very obscure revolving lines, which show a slight tendency to 

 carry tubercles ; these are only visible under a glass ; edge of body whorl bounded by 



