LIMOPSTS. 71 



Pectunculus euglyphus, sp. nov. Plate XIV, figs. 13 a — e. 



Description. — Shell inflated, nearly equilateral, outline rounded, length and 

 height nearly equal ; posterior border (especially its dorsal part) less curved than 

 the anterior. Umbones large. Hinge-line moderately long. Ornamentation con- 

 sists (1) on the anterior part of the valves of numerous fine, rounded, radial ribs, 

 crossed by very faint concentric ridges and a few distant growth-lines ; the radial 

 ribs are separated by well-marked but narrow grooves with puncta ; (2) on the 

 posterior part of the valves of broader, flatter radial ribs, crossed in a regular 

 manner by fine, rather closely-set concentric ridges. 



Measurements : 



Length . . . . . . . 22 mm. 



Height 22 „ 



Affinities. — Pectunculus subpulvinatus, d'Archiac, from the Tourtia of Tournay, 

 apparently differs from this species in the obliquity and greater convexity of the 

 valves, and in the ornamentation being somewhat coarser and of the same type on 

 the anterior and posterior parts of the shell. 



P. euglyphus is more inflated than P. sublsevis, and also differs in the character 

 of the ornamentation. 



Types. — Three specimens in Mr. Meyer's collection. 



Distribution. — Chalk Marl (Meyer's Bed ii) of Dunscombe. 



Genus — Limopsis, A. Sasso, 1827. 



[' Gioruale Ligustico di Scieuze,' i, p. 476.] 



Limopsis albiensis, sp. nov. Plate XV, figs. 1 a — d, 2 — 4. 



1874. Pectunculus, sp., F. G. II. Price. Quart. Journ. G-eol. Soc, vol. xxx, 



p. 360 (in list from Bed ii). 

 1879. — (= Lucina orbicularis ?), Price. The Gault, p. 62. 



Description. — Shell small, oval, shorter than high, somewhat inequilateral and 

 oblique, of moderate convexity, compressed postero-dorsally. Anterior and 

 ventral margins evenly rounded, posterior less curved and forming a blunt angle 

 with the hinge-line. Umbones of moderate size, pointed. Hinge-line long, more 

 extended posteriorly than anteriorly. Hinge-area long. Ornamentation consists 

 of broad, flattened concentric ridges, separated by sharp, narrow grooves. Radial 



