SANGUINOLITES. 77 



tion so that their number is greatly reduced in front. Surface also ornamented 

 with finer minute radiations and concentric lines (fig. 24 a). 



Size. — Length about 35 mm. 



Localities. — One specimen from Landlake is in the Museum of Practical 

 Geology; one in the Barnstaple Museum from Sloly; and two in the Woodwardian 

 Museum from S.W. of Sloly. 



BemarJcs. — The crushed and fragmentary or obscured state of these specimens 

 renders them very difl&cult to understand, but a comparison with Phillips's figures 

 (the originals of which I have not seen) makes me believe that they are identical 

 with them, while the type of Sowerby's Ludlow shell in the Museum of the Geological 

 Society, though considerably larger, so closely resembles them that I do not see 

 the way to separate them in the absence of more perfect specimens. As far as can 

 be seen they appear to belong to the genus LeptodomuSt but are distinguished 

 from L. constricta by the much more anterior position of the constriction, the 

 character of their ornament, their greater obliquity, and other points. 



2. Genus — Sanguinolites, M'Coy, 1844. 



This genus was originally defined by M'Coy, but made by himself and others 

 to include many shells which are not congeneric. It has since been restricted by 

 Hall, de Koninck, and Fischer. 



1. Sanguinolites Poeteri, n. sp. Plate IX, figs. 2, 2 a. 



I)escri]3tion. — Shell of moderate size, suboval, convex, very transverse. Hinge- 

 line very long, straight. Umbo very much flattened, incurved, depressed. 

 proximate, curving forward, extending slightly above the hinge-line, and situated 

 about one-fifth or one-sixth from the anterior end. Anterior margin subangular, 

 being concave above and convex below the angle. Inferior margin very wide, 

 gently and evenly convex. Postero-inferior point produced, bluntly angular. 

 Posterior margin short, straight, oblique. Keel, acute at first, then obscure, 

 running from behind the umbo to the postero-inferior point, and dividing the shell 

 into two portions, of which the postero-superior is obliquely concave and smooth, 

 and the anterior transversely convex, and covered by about forty very regular, 

 rounded, rather elevated, transverse ridges. Ridges divided by rather narrower 

 furrows, and seeming to diminish in size from the keel forwards, and only to amal- 

 gamate very close to the anterior margin. Signs of a narrow lunule. 



Size. — Height 14 mm., length 34 mm., depth of one valve about 4 mm. 



