190 Prof. F. M^Coy on some new Lower Paleozoic Mollusca. 



(from beak to opposite margin) y%%; length of anterior end -f—^, 

 from the beak to end of hinge-line -^^^ ; greatest depth of one 

 valve (about middle of diagonal ridge) j^^-^. 



I have seen numerous specimens of this species from the Upper 

 Ludlow rocks, usually confounded with the so-called Cypricardia 

 cymbiformis (Sow.), which it strongly resembles at first sight, 

 although the anterior end is considerably longer. That fossil, 

 however, has simple erect dorsal margins, and belongs to the 

 genus Orthonotus, while the distinctly inflected dorsal edges 

 forming the elongate, concave, posterior lunette show the pre- 

 sent sj)ecies to belong to the genus Sanguinolites. 



Not uncommon in the Upper Ludlow rock of Benson Knot, 

 Kendal, Westmoreland ; and in the micaceous grits of Lleche- 

 lawdd Myddfai, near Llandovery, S. Wales ; greenish schists of 

 Balmae shore, Kirkcudbright. 



{Col. University of Cambridge.) 



Capultis ? Euomphaloides (M^Coy). 



Desc. Depressed, spirally inrolled, 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 y^^^^, 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^Coy). 



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

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



