243 PALiEOZOIC MOLLUSC A. 



Capulus ? Euomphaloides (M'Coy). 



Desc. Depressed, spirally inroUed, whorls rounded; spire de- 

 pressed, of one and a half turns ; surface apparently smooth, or 

 faintly marked by broadly undulated wrinkles of growth (in- 

 dicating the waving of the right lip). Diameter 1 inch^ pro- 

 portional diameter of body-whorl -^-^q, height -^^-q. 



This curious species is so much depressed, that were it not 

 for the small size of the spire and the undulation of the lip, as 

 revealed by the flexuous lines of growth, it might be taken for a 

 Euomphalus. I at one time thought it might be desirable to 

 form a particular genus for those palaeozoic species, such as the 

 Nerita Haliotis (Sow.), Pileopsis neritoides (Phill.), &c., having 

 the form of Nerita, but an undulating lip and lines of growth ; 

 on examining carefully the recent Pileopsis intortus and allied 

 species, I found so gradual a passage from them to the ordinary 

 cap-shaped forms, that I prefer leaving them altogether for the 

 present. None of my specimens of that type of shells show the 

 mouth clearly, so that it is possible they may want the inner lip, 

 in which case the genus would be a very good one, and only 

 found I believe in the older rocks. 



Rare in the Lower Ludlow limestone at Green quarry, Leint- 

 wardine, Shropshire. 



{Col. University of Cambridge.) 



Pleurotomaria crenulata (M^Goy). 



Desc. Obtusely trochiform, length and width nearly equal ; apical 

 angle 85° ; spire of four obtusely rounded whorls, most con- 

 vex below the middle j band broad, depressed, bounded by two 

 delicate prominent keels, the upper edge being a little below 

 the middle of the whorl ; a space equal to the band in width 

 is visible below it on the turns of the spire ; base flattened, 

 gently convex, slightly umbilicate ; surface with close, sharp, 

 irregular, interrupted striae, slightly arched backwards from 

 the spire to the suture, and in the opposite direction beneath 

 it ; the oblique striae faintly crenulated by very minute spiral 

 striae, the band with coarse, irregular, backward arched lines 

 only. Length 6 lines, proportional width -^^qj length of body- 

 whorl -/^^Q. 



This bears some slight resemblance to the Turbo carinatus 

 (Sow.) of the Upper Ludlow, but is generically distinct by its 



