1905.] NATURAL SCIENCES OF PHILADELPHIA, 285 
have well-developed ectocones. The marginal teeth are bicuspid, as 
usual in Oreohelix, but the inner cusp is split. 
Oreohelix clappi Ferriss. Pl. XI, fig. 12; Pl. XXV, figs. 54-56, 
Nautilus, XVIII, p. 53 (September, 1904). 
This is a remarkable snail, slightly resembling Pyramidula solitaria 
on a small scale, but very different from any other Oreohelix by its 
rapidly narrowing umbilicus and green or olivaceous cuticle. 
The smoothish integument is blackish on the head and tail, and 
darker toward the foot margins, clsewhere tessellated with large poly- 
gonal gray pigment spots. Sole cream colored. There are two irregu- 
lar dorsal grooves. 
The kidney, 6.3 mm. long, is a thin-walled sack, its lumen large, 
with strongly corrugated walls. The pericardium is fully 4 mm. long. 
The reproductive system (Pl. XIX, fig. 8) resembles that of O. chiri- 
cahuana. The rather slender cylindric penis is enlarged at the summit, 
the protuberance on the upper side (in the figure) hollow. The epi- 
phallus enters through a very small acorn-shaped papilla. The walls 
of the penis are thin, with a minute oblique corrugation meeting V-like 
on one side. The penis measures 7, epiphallus 7, vagina 6, sperma- 
theca and duct 13 mm. long. The penis retractor is inserted about 1.5 
mm. from the base of the epiphallus. 
The jaw (Pl. XXIII, fig. 26) is arcuate and striate vertically. 
The radula (Pl. XXII, fig. 4) has about 29.1.29 teeth, of the general 
form usual in Oreohelix. There are rudimentary ectocones on the 
central teeth, at least where they are unworn. ‘The laterals have simi- 
lar outer cutting points. The marginal teeth are bicuspid. In general, 
the teeth are between the unicuspid type and that with developed 
ectocones. 
EXPLANATION OF PLATES XI-XXVII. 
Pirate XI.—Fig 11 was drawn by the author; the others are reproduced from 
photographs. ; 
Figs. 1-3—Oreohelix chiricahuana Pils. X 34. Co-types. 
Figs. 4-6.—Oreohelix avalonensis Hemph. X &%. Santa Catalina Island, 
California. 
Fig. 7.—O. avalonensis. Early whorls.  X 6. 
Fig. 8.—Oreohelix yavapai neomexicana Pils. Young specimen. X 3. Show- 
ing embryonic whorls and two neanic whorls. 
Fig. 9.—O. y. neomexicana. Segment of base. Only the coarser spirals are 
visible in the half-tone cut. 
Fig. 10.—Sonorella granulatissima Pils. No. 87,087. Miller Canyon. Por- 
tion of last whorl above the periphery. 7. 
Fig. 11.—Ashmunella angulata Pils. No. 87,113. Immature shell of § mm. 
diameter showing temporary lip-rib. 
