CEPOLIS. 181 



the columellar margin often callously thickened within ; ends of lip 

 somewhat approaching. Type C. bonplandi, pi. 58, fig. 56. 



Animal as described for C. alauda, but lighter colored. 



Jaw solid, high arched, smooth except for slight striae in places, 

 (pi. 52, fig. 18, C. bonplandi). 



Radula (pi. 52, figs. 20, 22, C. bonplandi) long, the middle and 

 lateral teeth with long basal plates and short, rounded mesocones, 

 no side cusps. Transition teeth developing an ectocone (fig. 22, 

 central with two adjacent laterals and two transition teeth). Mar- 

 ginals of the usual tricuspid type (fig. 20). 



Genital system as in Coryda, etc., but the retractor muscle is 

 stouter, flagellum and mucus glands longer (pi. 52, fig. 19, G. bon- 

 plandi}. 



C. bonplandi Lam., iv, 82. C. poeyi Petit, iv, 83. 

 C. supertexta Pfr., iv, 82. staminea Mke. 



C. arctistria Pfr., iv, 82. velutinata Bk. 



C. exdeflexa Pils., v, 198. C. bryanti Pfr., iv, 83. 



deflexa Pfr. not Brauu. C. desidens Rang, iv, 83. 



Section Cory da Albers, 1850. 



Cory da ALB., Die Hel., p. 100, for alauda and varieties. Histrio 

 PFR., Mai, Bl., 1855, p. 185 ; 1877, p. 8, for H. dennisoni.Helico- 

 styla BECK, Index, p. 36, in part. 



Shell depressed-globose, imperforate, solid and strong, smooth, 

 with deeply and abruptly deflexed last whorl, very oblique, trans- 

 versely oblong aperture, the lip expanded, thickened within, and 

 having a conspicuous banded, obliquely streaked or dotted color 

 pattern. Type H. alauda pi. 56, figs. 3, 4. 



Animal of H. alauda blue-black, the sole light slate colored in 

 the middle, not tripartite except in color. Foot long, granulated, 

 without distinct longitudinal grooves on back and lacking facial 

 grooves. Tail evenly and more finely granulated, acute behind. 

 Mantle-edge thin, with a low right body-lappet and a minute left 

 one. Right eye retracted between branches of genitalia. 



Jaw (of H. alauda pi. 57, fig. 45) solid, highly arched, with a 

 wide median projection, its surface entirely smooth. 



Radula (of H. alauda pi. 57, fig. 49) long and narrow, with V- 

 shaped rows according to the formula 24. 9. 1. 9. 24. Median teeth 

 with long basal plates and short, broad mesocones, no side cusps. 



