No.1736. SOME L\XI> SHELLS FROM PERV—DALL. 181 



'Phis species mighl be assigned either to the group of J!, reentzi 

 Philippi or B. derelictus Broderip, but differs in specific characters 

 from either of the known species assigned to these groups. I have 

 much pleasure in naming it after the collector. 



Type. -U. S. Nat. Mus. No. 209270. 



BULIMULUS (LISSOACMEi PTYALUM, new species. 



Shell plump, conic, with a mammillary smooth brown nucleus and 

 a generally bluish white color with sparse irregularly distributed black 

 dots; nucleus with two and a hall' translucent whorls 

 and an apical dimple; subsequent whorls feebly 

 rounded, with an appressed suture which is in the 

 earlier whorls laid against a peripheral angle of which 

 there is no trace in the later ones; sculpture of fine 

 feeble retractive flexuous wrinkles, usually with nar- 

 rower interspaces, becoming obsolete on the last 

 whorl, and crossed by line feeble spiral striation, most 

 evident in tin 1 interspaces on the earlier whorls; last fi G .:s.— bulimulus 

 whorl somewhat produced, moderately rounded, and (lissoacme) 



. . . .. * , . , ... PTYALUM. 



curving roundly into a deep subcylmdnc umbilicus; 

 aperture semilunate, the basal and outer margins paler, reflected; 

 interior and pillar dark brownish; the lips approach each other on 

 the body, the outer one hardly descending, the inner one wide, hardly 

 reflected over the umbilicus; pillar without twist or fold. Height 

 of shell 25; of last worl IS; of aperture 8.5; of umbilicus 1.7 mm. 



On cacti and mimosa on the banks of the Rio Pampas, Peru, 

 collected by Doctor Bingham. 



This species evidently belongs to the same group as the last, though 

 specifically distinct. It has some resemblance to the B. rhodolarynx 

 of Reeve (placed by Pilsbry provisionally in the genus Neopetrseus) 

 but is a much smaller shell, with more ovoid and less protracted aper- 

 ture. 



Type.— U. S. Nat. Mus. No. 209271. 



CLAUSILIA (NENIAi PAMPASENSIS Pilsbry, new species. 



The shell is slender, fusiform, somewhat attenuated at the apex, 

 lustreless, gray-white over a dull brown surface, visible where the 

 outer sculptured layer is rubbed oil*. Sculpture of very line and close, 

 unequal and uneven strise in the direction of growth lines. In places 

 they are discontinuous, forming long, lanceolate granules. This white 

 striate layer is worn oil' on the veil! ral side of each whorl. Whorls 121, 

 the first two brown and glossy. To the fourth or fifth whorl the 

 diameter scarcely increases; then the whorls increase slowly in diam- 

 eter to the penultimate which is widest, and, like those preceding, is 

 moderately convex. The last whorl is flattened, tapers toward the 

 base, and finally becomes free, descending more rapidly to the 



