The IIoii. E. Chitty on the StoastomidcC. 149 



Petitia Grevilleana, Chitty. 



Hah. Yallahs Hill. 



Form, e;lobosc-cUscoid. Coloitr, pale liorn. Scidpture, strife of 

 growth visible ; f) strong spiral cariiinc, with .5 less strong intervening : 

 on the ui)pcr whorls, 2 strong, with the lesser intenncdiatc ones 

 (this might almost be classed in the 2nd division of WiUdnsoncea). 

 Spire, slightly elevated, with straight outlhies. Jlliorls, 3-^-rds, well 

 rounded, with a well impressed suture. Aperture, obliquely elliptic, 

 more expanded in the uj)per than lower portion, slightly campauulate 

 on the right owing to a slight constriction behind the labrum. La- 

 hrum, very slightly produced above, thickened and reflected at about 

 its middle. Labiuui, below the plane of the labrum above, slightly 

 curved to the right below and thickened, slightly detached from 

 botly-whorl. Umbilicus, not deej), broad. Lahral lamella, slightly 

 developed. Operculum, moderately concave, shining, but with very 

 fine granulations. 



Height 0-05, greatest breadth O-OfiO, least breadth 0-057. 



Named in complimeut to my friend Ur. R. K. Greville, of Ediu- 

 burgh. 



Petitia Carpenteriana, Chitty. 



Ilab. Pool's Rock, Hanover. 



Form, globose-discoid. Colour, ? Sculpture, stria) of growth 



visible : 8 strongest spiral carinoe and 1 strong ; 5 strongest and 1 

 strong in each interspace ; and 2 stronger round the umbilicus : on 

 the upper whorls 3. Spire, much depressed with convex outlines. 

 IJ'horls, Sjrds, moderately rovmdcd, with a deep suture. Aperture, 

 semicircular, rather constricted behind the Uvbrum, not expanded, 

 very slightly detached from the body-whorl. Labrum, not produced 

 above, smooth, rather double, inner edge sharp, the strongest lines 

 terminating abruptly at the outer edge. Labium, very slightly 

 curved to the right below, well detached from the body-whorl, lower 

 than the jdane of the labrum below. U^nbilicus, very shallow and 

 broad, nuich covered by the labral lamella, w^hich is much and widely 

 produced above. Operculum, ? 



Height 0038, greatest breadth O'O/, least breadth 0-05-1. 



Named in compliment to P. P. Carpenter, Esq., of Warrington, 

 author of an excellent Catalogue of the Mazatlan Shells in the British 

 Museum. 



Petitia (?Le\visia) Barroniana, Chitty. 



Hab. ? (unique). 



Form, globose-discoidal. Colour, ? Sculjifure, 20 spiral 



carinsc, 7 of which are rather more prominent, namely the 2nd, 4th, 

 8th, 12th, l6th, 1 8th and 19th : on the upper whorls, (5. Strife of 

 growth visible. Sjnre, much dei)ressed, with straight outlines. 

 IJ'horls, 4, moderately rounded, with a light suture. Ajyerture, much 

 constricted at the labrum, semicircular, widely separated from the 

 body-whorl. Labrum, not produced above, simple, thiu, rather 



