630 PROCEEDINGS OF THE ACADEMY OF [DeC.^ 



light horn colored, with a thin, grayish -yellow epidermis; nepionic 

 1^ whorls smooth, and, beginning on the second whorl, everywhere 

 sculptured with fine, irregularly sized and grouped, retractive, 

 arcuate costulse, showing under a strong glass as if they were sharp 

 edged, with broad, rounded interspaces; most specimens also showing- 

 some evidence of obsolete spiral striations on the last two whorls. 

 Whorls 5, slightly convex above, well rounded below and broadening 

 decidedly toward the mouth for the last quarter turn; periphery 

 well rounded, sutures slightly impressed, the upper aspect of the- 

 shell being flattened to the middle of tJie last turn, then slightly 

 descending. Aperture oblique, lunate, as if one fifth of a circle were 

 cut out by the convexity of the penultimate whorl; peristome sharp, 

 showing a slight reflection for about one millimeter before joining 

 the lower parietal wall; extremities of the peristome approaching, 

 joining the parietal wall nearly at right angles, the upper nearly 

 horizontally, the lower nearly in a vertical cUrection. Alt. 6, greatest 

 diam. 12.5, least diam. 10.5, alt. of penultimate whorl at the mouth 

 4.5, alt. of mouth 5.25, least diam. of mouth 4 mm. 



The animal is dark gray with lemon-yellow tentacles. 



About 150 specimens of this species were taken at Camp 39, 

 M. & M. R. R., a few only living, seven at Camp 40, four living and 

 seven dead at Camp 46, one dead at Porto Velho and four living 

 specimens were sent by Mr. C. W. Eaton, of the engineering force 

 of the Madeira-Mamore R. R., without location noted; also one 

 living and fourteen dead specimens, taken at the vSerra do Erere,. 

 were sent from the Goelcli Museum by the Director, Dr. Emilia 

 Snethlage, to whom the species is dedicated. 



Genus ENTODINA Ancey. 

 Entodina jekylli n. sp. PI. XXII, figs. 11, 12, 13. 



Shell widely, perspectively umbilicate, grayish corneous; nucleus 

 nearly smooth, and, commencing on the second whorl, ever\'where 

 sculptured with prominent, narrow costae (about eleven to the 

 millimeter at the begimiing of the last whorl), separated by broad 

 interspaces, nearly vertical on all but the last whorl, where they 

 become arcuately retractive; costae slightly less prominent below 

 the periphery, but showing distinctly as they dip into the umbilicus, 

 as well as on the preceding whorls within the umbilicus. Whorls 

 4f, convex, periphery well rounded, sutures deep. Aperture di- 

 agonal, irregular, a broad oval below, partially separated by the 

 teeth from a small, oblique oval above; lip shortly reflected, very 



