PUPISOMA. 29 



It should be noted that some other species of Pupisoma 

 show resting stages comparable to the swelling noticed in 

 this one. It is a character of old age, and probably not in 

 itself of specific significance. 



7. PUPISOMA ORCELLA (Stoliczka). PL 3, figs. 5, 6, 7. 



Shell subglobose-conoid, at apex obtuse, very narrowly per- 

 forate, thin, corneous ; whorls 3%, strongly convex, joined by 

 a simple suture, transversely thread-striate. Aperture sub- 

 rotund, a little oblique, toothless; outer margin very thin, 

 scarcely spreading; columellar margin whitish, slightly 

 twisted, reflected above, almost wholly covering the umbilicus. 

 Alt. 1.7, diam. 1.25, alt. aperture 0.6 mm. (Stoliczka). 



Penang, under bark of Cocos nucifera (Stol.). 



Pupa (Pupisoma) orcella STOL., Journ. Asiat. Soc. Beng., 

 xlii, 1873, p. 33, pi. 2, f. 2. 



' ' The animal is gray with dusky pedicles but no perceptible 

 trace of tentacles. The species differs from P. llgivicola by a 

 shorter and broader form, more convex whorls, and by a 

 very slightly expanded and thin outer lip. In fresh speci- 

 mens some of the transverse stride of the cuticle are rather 

 stronger than others, but they very soon wear off" (Stoliczka), 



Stoliczka 's figures are copied, pi. 3, figs. 5, 6. A Penang 

 specimen believed to belong to this species is drawn in fig. 7. 

 It measures, alt. 1.9, diam. 1.65 mm., nearly 4 whorls. The 

 umbilical crevice is very minute. The surface has rather 

 sharp though low and unequal striaB, and under the micro- 

 scope shows engraved spiral lines, distinct on the base but 

 elsewhere faint. 



8. PUPISOMA CACHARICUM God win- Austen. PI. 3, fig. 4. 

 "Shell scarcely perforate, globosely conoid, very tumid, 



corneous; sculpture, spiral striation, crossed by a fine, close, 

 thread-like ribbing; color, pale umber-brown; spire moder- 

 ately high, conic; apex blunt; suture open; whorls 3^, 

 rapidly increasing, very convex; aperture nearly circular, 

 oblique ; peristome thin, columellar margin perpendicular re- 

 flected. Major diam. 1.33; alt. 1.5 mm." (G.-A.). 



