114 



cxcLoriioRiD.i:. 



"Diam. maj. 14 mm., min. 12 mm., alt. 5 mm." (Fulton.) 

 Hub India : Khasi Hills, Assam. 



Fig. 18. — Pearsonia assamensis. (X 2.) 



" In most respects this species is very like nagaense, Aust. & 

 Bedd., but can be easily separated by the position of the breathing 

 tube, which in assamense is much nearer the aperture. The 

 0])erculum of nagaense does not appear to have so many whoi-ls 

 as our species, a large part of the central portion being quite flat 

 and smooth. These characters appear to be constant in the 

 numerous specimens I have examined of both species." (Fulton.) 



The accompanying illustration is from the type in the British 

 Museum. 



162. Pearsonia avana, Blanfonl. 



Spiraculum ammtim, Blanford, J. A. S. B. xxxii, 1863, p. 319 ; 



Theobald, Cat. Shells Brit. India, 1876, p. 38 ; Nevill, J. A.S. B. 



xlvi, 1877, p. 28 ; id., in Anderson, Zoul. Res. E.xp. AV. Yunnan,!, 



1879, p. 889. 

 Pteroci/clos (Spiraculum) amnus, Hauley & Theobald, Conch. Ind. 



1875, pi. 134, tigs. 8, 9. 

 Pterocydus (Spiraculum) avamis, Nevill, Hand List, i, 1878, 



p. 264. 

 Spiraculum (s. str.) amnmn, Kobelt & Mollendorff, Nachr. Dents. 



Malak. Ges. xxix, 1897, p. 114 ; id., Cat. Pneum. 1899, p. 26. 

 Pearsonia (Pearsonia) avana, Kobelt, Das Tierreich, Lief. 16, 1902, 



p. 172. 

 Pearsonia avana, Kobelt, Conch. -Cab., Cyclophoridae, ii, 1913, 



p. 971. 



Original description: — "Shell convexly depressed, widely um- 

 bilicated, marked with radiating striaa and covered (in young 

 specimens) with a thick scabrous epidermis ; colour white, with 

 broad zig-zag chestnut stripes crossing the whorls, and a wide sub- 

 median iDand of the same colour surrounding the shell. Spire 

 scarcely raised, suture deep. Whorls 4^, rounded ; the last cylin- 

 drical, descending slightly and gradually towards the mouth, and 



