212 ZOXITIVX. 



projecting, suture almost flat ; whorls 3, rapidly increasing, flatly 

 convex, the last descending in front, rounded at the periphery ; 

 aperture Innately ovate, very oblique ; peristome thin, margins 

 converging. 



Major diam. 25, rnin. 19|, height 14 mm. Other specimens 

 measure 29| mm. in major diameter. 



Hob. Eastern Burma, about 300 miles N.E. of Moulmein 

 ( Woodfhorpe). 



The animal is much like that of C. prcestans, the left shell-lobe 

 covered with large oval tubercles intermixed with smaller, some 

 pale-coloured, some black. The dart-sac is very large and attached 

 by strong muscles almost throughout its length. The radula con- 

 tains 132 rows of teeth, thus arranged : 140 . 3 . 17 . 1 . 17 . 3 . 140 

 (160 . 1 . 160), and the teeth are differently formed from those 

 of C. prcestanS) the admedians more numerous, and the outer 

 terminally bicuspid throughout. 



316. Cryptosoma ? birmanicum, Phil Zeitsch. f. Mai 1847, p. 65 ; Pfr. 



Mm. Hel ii, 1848, p. 498; H. $ T. C.' I. 1876, p. 61, pi. 152, 

 fig. 7 ; Nevill (Helicarion), Hand-L i, 1878, p. 14. 



Shell depressedly globose, thin, pellucid, very smooth and 

 polished, pale horny ; spire low, suture slightly impressed ; 

 whorls 3|, convex, the last rounded at the periphery, descending 

 in front; aperture oblique, roundly lunate, broader than high; 

 peristome thin. 



Major diam. 11, min. 8, height 5 mm. 



Hob. Near Mergui (PTiilippi). 



There are two specimens of shells with this name in the British 

 Museum. Though they differ a little from Philippi's and Pfeiffer's 

 descriptions they agree, on the whole, fairly. 



317. Cryptosoma austeni, Collinge, Jour. Mai. vii, 1898, p. 2, pi. 1, 



figs. 1-5. 



" Shell : apex depressed, thin, striae definite, brownish or horn 

 colour." Whorls 3j. 



Animal light yellowish brown, darker on the head and posterior 

 dorsum, which latter is shortly keeled. Eight shell-lobe well- 

 developed, left lobe very large Caudal mucous pore large, with 



no overhanging groove. . . . Foot-sole divided. Length of animal 

 (in alcohol) 22'5 mm. 



Sab. ? Sent from Calcutta, but probably derived from some other 

 place. 



In a brief account of the anatomy it is pointed out that the 

 generative organs differ in several points from those of C. prcestans. 

 [The shell is very unlike that of Cryptosoma ; more like that of 

 Cnjptaustenia bensoni.'] 



