400 rERUSSACID.E. 



basal margin arcuate, columella deeply arcuate and strongly curving 

 forward, obliquely truncated at the base. 



Length 30*5, diam. 13'25 mm. 



Huh. Ceylon (Beddome). Type in the British Museum. 



This form was stated by Beddome to differ from G. heddomei 

 only in being of a straw coloui-, but I find that the spire is not 

 concave near the apex, the shell is more convex in outline, with a 

 broader base, the striae are more cro\\ded and finer, and the 

 aperture is wider. Under these circumstances I have no hesita- 

 tion in according this form specific rank, A second specimen 

 has more Comdex whorls and measures 31*5 x 13-5 mm. 



Beddome hazards the opinion that the i)resent form is G. in- 

 ornata, var. /J of PfeifFer *. This statement appears to me to be 

 based on a misconception, for I find a specimen of true inornata 

 occurs in the same box with pallens. 



374. Glessula prestoni, sp. n. 



Shell cylindro-conoid, rather solid, opaque, a little shiniug, 

 finely and closely, irregularly costulate-striate, the striae sinuous 

 near the suture, with excessively minute spirals in the interstices ; 

 a shallow groove, bordered by a few irregular spirals below it, 

 runs parallel with and close to the suture from the beginning of 



Fig. 126. — Glessula prcsfonl. I. 



the third whorl. Spire convex conoid ; suture linear, margined : 

 apex obtuse. Whorls 8, increasing rapidly, flattened, yellowish 

 corneous with fuscous transverse streaks, the last whorl exceeding 

 t of the entire length of the shell, subangular at the periphery. 

 Aperture nearly vertical, obovate, margins united by a thin callus 

 on the parietal wall ; peristome thickened, outer margin sHghtly 



* Conch.-Cab., Bulimus. I860, pi. 37, figs. 1, 2. 



