296 PUPILLIDJE. 



"Long. -16 [=4 mm.], lat. -09 [=2-25 mm.], aperturse alt. 

 06 unc. [=1-25 mm.]." (Theobald.} 



Hob. Burma: Shan States (Fedden) ; Bhamo (Anderson). 

 Pingourig, Shan Hills (Godwin- Austen). 



Theobald states that the species resembles P. batJiyodon, Benson, 

 but is more acuminately and regularly pyramidal. I have not 

 seen bathyodon, but to judge by the figures in Conch. Ind. the 

 comparison is not a happy one. B. sahuiniana appears to me to 

 assimilate rather with plicidens. The spire, however, is more 

 attenuated, and the shell is about twice as large. There is also 

 an inflection of the right (outer) margin of the peristoine, which 

 is continued as a horizontal superficial groove on the outer wall, 

 corresponding with an elongated horizontal fold on the inside of 

 the right margin, a feature which still further tends to connect 

 this species with plicidens, and induces me to place it in the 

 genus Boysidia. 



Two specimens in the Bed dome collection (British Museum), 

 labelled Burma, are rather larger than the type, measuring 

 5*2 x 3*5 mm. including the peristoine. 



Godwin-Austen, who records it from Pingoung, Shan Hills, 

 at an altitude of 2500 feet, mentions that the only perfect 

 specimen found was bleached, but a smaller imperfect one was 

 covered with a brown epidermis. He calls it a very beautiful 

 little shell, which undoubtedly it is. 



Genus BOYSIA, Pfeiffer. 



Boysia, Pfeiffer, Zeit. Malak. vi, 1849, p. 105 ; ibid., Mon. Helic. 



Viv. iii, 1853, p. 528 ; ibid., Conch.-Cab. Helix, ii, 1853, p. 6 ; 



Adams, Gen. Eec. Moll, ii, 1855. p. 167 : Nevill, J. A. S. B. 1, 



1881, p. 128 ; Pfeiffer & Clessin, Nomencl. Helic. Viv. 1881, 



p. 343. 

 Hypostoma, Albers, Die Heliceen, 1850, p. 130 (non Hypostoma, 



Rudolphi, 1809, Venues, non Hypostoma, auct. (Hypostomus, 



Lacepede, 1803), non Hypostoma, Gray, 1841, Ecliinod.). 

 Hypotrema, von Martens, Die Heliceen, ed. 2, 1860, p. 304 (noni. 



mut. as section of Pupa). 



TYPE, B. boysi, Pfeiffer. 



Range. India. 



Shell globose-conoid, thin, rimate, last whorl arcuately ascend- 

 ing ; aperture oblique, directed upwards, subrotundate,, con- 

 tinuous, edentulate. 



Anatomy unknown. 



The only known species of this genus has had a somewhat 

 checkered career. Described originally by Pfeiffer in 1846 as 

 Tom,ogeres boysii (evidently a misprint for Tomigerus), it was in 

 1847 transferred by the same author to Anostoma, both the 

 generic and specific designation being apparently suggested by 

 Benson, who published the name in 1848. Pfeiffer having 

 arrived at the conclusion in 1849 that the species could not be 

 retained in Anostoma, created the genus Boysia for its reception, 



