582 PROCEEDINGS OF THE ACADEMY OF [Dec, 



also the shape of the shell in the half-grown and younger stages, 

 wherein the base is far less convex than in S. adamsiana, and the 

 aperture much narrower. The lamellae are substantially alike in the 

 two species except that the columellar lamella extends strongly upon 

 the columellar margin, so that it is visible in the aperture of S. jayana, 

 but not visible or only weakly in S. adamsiana. 



The half-grown young shells resemble S. connectens (C. B. Ad.) very 

 closely in shape, but they differ by the columellar lamella, which 

 appears strong in a view in the aperture, while in S. connectens it is 

 not visible from the mouth. 



Swainson's figure of Epishjlia conica (Malacology, p. 165, fig. 18a), 

 has perhaps more resemblance to S. jayana than to any other species, 

 but it is rude and of very uncertain application to this or any species. 

 Later in the same work Swainson has an Epistyla conica (p. 331) 

 based on fig. 281 of Sowerby'si!famtai,which represents Sagda cookiana. 

 We have confirmed the synonymy of S. jayana given in the Manual 

 of Conchology, IX, p. 61. 



A small race of S. jayana occurs at Bog Walk, where it was col- 

 lected by Messrs. Wm. J. Fox and C. W. Johnson. The shell 

 measures: alt. 16.3, diam. 20 mm., with nearly 8 whorls. It will 

 probably prove to be a distinct subspecies. 



Sagda adamsiana n. sp. Plate XLIII, figs. 1 to 7. 



Sagda jayana Pilsbry and Brown, Proc. A. N. S. Phila., 1910, p. 517, and 

 probably of other authors on the Mandeville fauna. 



The shell is pyramidal, with dome-like summit and an enlarged, 

 prominent, well-rounded last whorl, more ample than that of S. 

 jayana; base convex, rather deeply but narrowly impressed in the 

 centre, its greatest convexity midway between axis and periphery. 

 Surface finely, rather weakly striate, and in places showing traces of a 

 microscopic woven texture. Aperture deeply lunate. Basal lamella 

 somewhat over a half whorl long, situated outside of the greatest 

 convexity of the base, its end visible deep in the throat. Columellar 

 lamella as long as the other, its lower end weakly or not visible in the 

 mouth. 



Alt, 27, diam. 29| mm.; 10£ whorls. 

 " 23|, " 28 " 9f " 

 " 21|, " 24 " 9| " 



Young shells of 6 or 7 whorls are depressed with very convex base 

 and narrow axial impression, the basal margin of the aperture much 

 more deeply curved than in S. jayana. Basal lamella nearly a 

 whorl long, extending almost to the lip. Columellar lamella about 



