668 C. CALLAWAY ON A NEW AREA OF UPPER 



rapidly tapering behind, at half the length of the tail contracting 

 to a tip, and continuing as a narrow rib to the extremity ; 

 side ribs not sharply separated ; front side ribs curved backwards 

 and ending in free points which are parallel to the axis, 

 grooved down the centre almost to the ends ; second ribs similar, 

 but bent more abruptly backwards ; third ribs united on the rib- 

 like prolongation of the axis into a broad ensiform limb, the ante- 

 rior half of which is embraced by the other ribs, and is marked by 

 similar grooves parallel to its sides, while the hinder half projects 

 in a broad point, the sides of which form an angle of about 60°. 



Length ^ inch. 



This tail bears some resemblance to Paradovides, but is more like 

 LicJias, yet can hardly be classed with either. The specimen is 

 unique; but I have thought it of sufficient interest for description. 



Lichapyge cuspid ata, Call. (Plato XXIV. fig. 8.) 



Same reference. 



From the Shineton Shales at Shineton. 



Peimitia, R. Jones § Holl. 



I have collected more than one species of this genus at Shineton ; 

 but Prof. Eupert Jones, who has been kind enough to examine them 

 for me, is unable to identify them with any known species, and the 

 material at my command is not sufficient for satisfactory description. 

 Messrs. Rupert Jones and Holl figure two Primitice from Shineton in 

 Ann. Xat. Hist. scr. 4, vol. iii. p. 221, stating that their specimens, 

 which they observed in the Woodwardian Museum, did " not exhibit 

 sufficiently definite characteristics for exact determination." 



Theca, Soiv. 



TfLECA lineata, Call (Plate XXIY. fig. 9.) 



Same reference. 



Biconvex, length four times the breadth, aperture straight, longi- 

 tudinally striated, about 25 striae in its greatest width. 

 Length about § inch. 

 Shineton Shales at Shineton. Xot rare. 



Belleeophox, Montfort. 



Bellerophon shinetoxexsis, n. sp. (Plate XXIY. fig. 10.) 



Rapidly expanding, aperture large, striated transversely, about 5 

 striae to the line. 



Greatest diameter 7 lines. 



Shineton Shales at Shineton. Rare. 



Lixgulella, Salter. 



Lixgulella Xicholsoxl Call. (Plate XXIY. figs. 11, 11 a, 11 b.) 

 Same reference. 



