PUPISOMA. 23 



Alt. 1.5, diam. 1.33 mm., closely ribbed; Silchar. 



P. cacharicum, no. 8. 



Larger, up to 2 x 2mm. ; 3%-3% whorls VIII 



VIII. Thread-stria te ; Penang P. orcella, no. 7. 



Irregularly, finely striate ; Japan to S. Africa and New 

 Caledonia P. orcula and allies, nos. 9-15. 



1. PUPISOMA LIGNICOLA (Stoliczka). PI. 2, figs. 7, 10. 



Shell shortly swollen-ovate, subconic, corneous, slightly 

 rimate, the apex obtuse. Whorls 4%, a little convex, covered 

 with moderately distant, transverse, slightly arcuate riblets 

 alternating with some finer striae, becoming obsolete at the 

 base. Aperture subrotund ; labium [parietal wall] very thin ; 

 very rarely furnished with a small median denticle; outer 

 lip thin, very little dilated, toothless, slightly ascending on 

 the penult whorl. Columella slightly expanding towards the 

 base, covering the umbilical region, twisted, somewhat toothed 

 below. Alt. 2, diam. 1.5, min. 1.2 mm. (Stol.). 



Burma: Moulmein, Tenasserim, on masonry of the great 

 Pagoda, and on the opposite bank of the river at Martaban 

 on similar wooden structures ( Stoliczka) . Kangan caves, near 

 Moulmein (Stoliczka, Nevill). Rangoon (Hungerford). 



Pupa lignicola STOL., Journ. Asiat. Soc. Beng., xl, 1871, p. 

 171, pi. 7, f. 3. HANLEY and THEOBALD, Conch. Indica, pi. 

 160, f. 6. Pupa (Pupisoma) lignicola STOL., J. A. S. B., xlii, 

 p. 32. NEVILL, Handlist Ind. Mus. Moll., i, p. 192. Pupi- 

 soma lignicola GODWIN-AUSTEN, Land and Freshwater Moll. 

 India, ii, 1910, p. 300. GUDE, Fauna Brit. India, Moll., ii, 

 p. 34. 



''The animal is grey with somewhat darker, very short 

 pedicles and almost obsolete tentacles. The columella of the 

 shell is at the base peculiarly expanded, flattened, somewhat 

 twisted, producing at the lower part a small denticle. Out 

 of a great number of specimens only one was met with which 

 has a small tooth about the middle of the inner or parietal 

 lip; its presence, therefore, must be regarded as an excep- 

 tional character" (Stoliczka). 



The riblets mentioned by Stoliczka are partly cuticular 



