1910.] NATURAL SCIENCES OF PHILADELPHIA. 527 



in a dorsal view), and the smaller size, a specimen of T. discoidea with 

 3£ whorls measuring 6 mm. in diameter. 



Sagda grandis n. sp. Figs. 7, 8. 



The shell is large, solid and high, the diameter not much exceeding 

 the height; white under a very thin pale yellow cuticle. The spire 

 is dome-shaped above; whorls about 9£, somewhat convex, the first 

 If nearly smooth, several following whorls densely and regularly 

 sculptured with fine, close, slightly curved, retractive striae, but on the 

 last two whorls they become almost obsolete; on the later whorls, 

 especially the last two, a secondary sculpture of extremely minute 

 vertical and slowly ascending spiral threads appears. On the base 

 this is wanting ; and denuded shells show traces of it like an extremely 

 fine fabric pressed into plastic clay. The last whorl in front view is 

 double the width of the preceding, is rounded peripherally, rather 

 convex on the base, and rather deeply excavated around the axis. 

 Aperture of the usual lunate shape. The basal lamina varies from 



Figs. 7, 8. — Sagda grandis. Fig. 9. — Sagda spei. 



± to one whorl long and is very high. It revolves at or barely within 

 the greatest convexity of the base. The columellar lamella is either 

 entirely wanting or low, blunt and weak, high on the axis. 



Alt. 26^ diam. 28* mm. 

 " 26 , " 29 " 



Somerset, Manchester. Types No. 100,883, A. N. S. P., collected 

 by Dr. A. P. Brown, May, 1910. 



This fine Sagda is one of the largest of the genus. It occurs with 

 S. jayana (C. B. Ad.) from which it differs by (1) the weakness or 

 absence of a columellar lamella (2) the position of the basal lamella, 

 which revolves decidedly nearer the center than in S. jayana. (3) the 

 apical whorls, which are distinctly larger in grandis than in jayana 

 34 



