58 



HELICID.li. 



Shell widely umbilicated, rotundate, discoid, somewhat thin, 

 dark chestnut or blackish brown, irregularly costate, on the last 

 whorl the costsc are iuterraingled here and there with obliquely 

 descending wrinkles, dull above, shining below. Spire plane, 

 suture a little impressed. Whorls 5i-6, flattened above, tumid 

 below, bluntly carinated above the periphery, a few traces of 

 spiral sculpture on the lower surface; the last dilated towards 

 the mouth, shortly and abruptly descending in front. Aperture 

 oblique, almost subhorizontal, elliptic-ovate ; peristome livid, 

 thickened and reflected, upper margin nearly straight, outer 

 curved, lower straight with a subquadrate callus, columellar very 

 short, obliquely ascending ; a slight ridge on the parietal callus 

 connecting the margins of the peristome and giving off a long, 

 sinuous, entering fold, ascending at first, the posterior extremity 

 descending, below this occurs a shorter, free, flexuous, horizontal 

 fold. Palatal folds 4, the first (upper) slightly ascending towards 

 the aperture, and considerably attenuated anteriorly, the second 



Fig. 14. — Cor ilia heddvmccB (type). 



Fig. 15. — Corilla heddomece, 

 small variety. 



and third shorter, more elevated and more oblique, the fourth 

 subparallel with the lo^\er suture. 



Major diam. 17'5-20, minor 14-16, alt. 6-6-5 mm. 

 Hah. Ceylon ; Haycock Mountain (Beddome) ; Ambegamuwa, 

 AVatawala, Newara Eliya (Collett). 



This shell was formerly extremely rare in collections, but the 

 late O. Collett sent considerable numbers of it to England. 

 Prof. Pilsbry, in referring the species to Plectopylis, was probably 

 guided by its external characters. The absence of vertical or 

 transverse barriers on the parietal \\all, however, amply warrants 

 its inclusion in Corilla. It differs in appearance from the other 

 species, being wrinkled, thinner in texture, and much flattened 

 above, iig. 14 shows the type in the late Col. Beddome's col- 

 lection. It measures 20 mm. in diameter. A small variety, from 

 "Watawala, in Mr. Ponsonby's collection, is shown in fig. 15. It 

 is less coarsely \vrinkied than the type, and is also paler and 

 smaller, measuring only 16 mm. in diameter. Fig. 15 e, which 



