CHILONOPSIS. 171 



doglessula and Buliminus. The almost luster-less earthy-brown 

 color, the open umbilical chink, with widely reflexed, flattened 

 columellar margin, which passes almost unbrokenly into the 

 rounded basal margin, speak at first glance for Buliminus; 

 but the strong, rather sparse ribs at the apex, with a some- 

 what obliquely set first whorl are quite as in Pseudoglessula. 

 The trace of a keel on the last whorl and the inward oblique 

 truncation of the columella also recall Pseudoglessula. 

 (Marts.} 



Buliminus stuhlmanni Marts, has the same apical sculpture 

 and may belong also to Pseudoglessula. 



Genus CHILONOPSIS F. de Waldheim. 



Chilonopsis FISCHER de WALDHEIM, Bulletin de la Societe 

 Imperiale des Naturalistes de Moscou, xxi, 1848, p. 236, for 

 C. sulcata Fischer de W. Bulimus, Bulinmlus, Pachyotus, 

 etc., of authors. 



The shell is imperforate or rimate, ovate or oblong, com- 

 posed of 6 3 /2 to 9 whorls. Aperture subvertical, irregularly 

 ovate, occupying less than half the shell's length; outer lip 

 simple, expanded or thickened; columella obliquely truncate 

 at the base. Coloration, when preserved, of whitish oblique, 

 interlacing marks or subsutural spots on a dark ground. 



Jaw (of C. melanioides, pi. 62, fig. 20) is arcuate, very 

 closely and finely striated. 



The radula (of C. melanioides, pi. 62, fig. 21) has the 

 formula 16, 11, 1, 11, 16. The transverse rows of teeth are 

 straight in the central and lateral areas, but curve strongly 

 forward in the marginal areas. The central tooth is narrow, 

 with a single well developed cusp. The laterals have strong 

 mesocone and ectocone, but no entocones. The eleventh and 

 twelfth teeth are transitional. The marginals have the ecto- 

 cone split, and on the outer teeth both cusps are split and, 

 producing a serrate edge, as shown in the figure. 



Egg-capsules of moderately large size, with a calcareous 

 shell, as in Achatina. These of C. nonpareil measure 6% x 6 

 mm. 



Type, Chilonopsis nonpareil (Perry). 



