CHALEPOTAXIS. 



167 



S. gibboni Pf'r., v, 182. 



magnified Lea not For. 



v. amori Hid., v, 183. 



v. cousini Jouss., v, 183. 

 S. prsestans Pfr., v, 184. 

 8. braziliana Fer., v, 184. 



? morlcandi Beck. 

 S. heliacaOrb., v, 135. 

 8. pascalia Gail!., v, 186. 



amazonica Hupe. 

 8. amazonica Pfr.. v, 186. 

 8. feistharaeli Hupe, v, 187. 



pundata Wagn. not Mi'ill. 



v. planior Pils., v, 188. 



S. incarum Phil., v, 192. 

 8. monile Brod., v, 192. 



planar bis Jay. 



loetzkesi Mill. 

 S. castelneaudii D. & H. v, 193. 



castelnaudii Hupe. 



castelnaui Pfr. 

 S. seleuostoma Pfr., v, 193. 



scl&rostoma Rv. 

 S. hians Pfr., v, 194. 

 8. tiloriensis Aug., v, 194. 

 S. iris Mill., v, 195. 

 S. rugifera Dohrn.,v, 195. 

 S. elaps Dohrn v, 196. 



Genus CHALEPOTAXIS Ancev, 1889. 



i f 



Chalepotaxis Ancey, Conch. Exch. Aug. 1887, p. 22, type 

 f infantilis Gredl. Cf. SCHACKO, Jahrb. D. M. Ges. XI, p. 157, pi. 

 3, f. 7-10 (dentition). 



Shell small, thin, shining, orbiculate-depressed, with narrow um- 

 bilicus and low-conic spire; last whorl scarcely descending in front ; 

 aperture lunate, slightly oblique, the peristome simple and unex- 

 panded except at the columella, where it is slightly dilated. Type 

 C. infantilis Gredler, pi. 57, fig. 34. 



Jaw very delicate. Radula (pi. 57, figs. 35-39, C. Infmiti/is^iih the 

 formula 25.1.25. Teeth all similar in form and in v-shaped rows. 

 Middle teeth having the median cusp enormously dilated into an 

 elliptical gouge projecting far beyond the basal-plate ; neck of the 

 cusp narrow, bottle-shaped ; side cusps basal, rudimentary and verti- 

 cal ; basal-plate narrow in front, widening and squared behind. 

 Lateral teeth similar, but the large cusp bends outward and the 

 eutocone is suppressed. Marginals differ only in becoming smaller, 

 with the ectocone decidedly longer (pi. 57, figs. 35, 37, group of 

 middle and lateral teeth; fig. 36 group of marginals; fig. 38, a 

 lateral in profile, turned 90 ; fig. 39, a lateral turned 45). 



This genus is founded upon one species having a shell resembling 

 an immature H. ximilaris Fer., or pyrrho-ona Phil, and a type of 

 dentition considerably like Oxychonn. The jaw is very imperfectly 

 known, and the genital system is unobserved. I am disposed to 



