28 ilK. J. CARTER ON THE PALEONTOLOGY OF [Feb. 1 898, 



half as wide again as that of the male. The chelae are of moderate 

 and equal size ; meropodite compressed, dorsal surface convex and 

 smooth ; anterior border rounded, posterior thin : propodite about a 

 fourth longer than wide, dorsum highl}- convex, with a median 

 longitudinal row of three tubercles and others of smaller size near 

 each of the borders ; palmar surface flat ; fingers shorter than the 

 hand; outer border of dactylopodite flat, edged by a delicate, 

 slightly dentate ridge on each side ; the dentary border trenchant. 

 Chelae identical in form with those of iV. Woodwardii, but scarcely 

 one-third as large. 



The claw which Bell has figured (pi. v, fig. 3) certainly cannot be 

 referred to this species. Specimens having the branchial region 

 Tendered tumid by some Bopyriform parasite are of frequent 

 occurrence. 



Distribution. — ^^umerous examples from the Cambridge Greensand 

 are in the Woodwardian, British, Jermyn Street, and York Museums, 

 and in my own collection. It occurs sparingly in the Upper Green- 

 sand of Warminster, and specimens from the Gault of Puttenham 

 are in the AVoodwardian Museum. 



NeCROCARCINUS TRICARIXAXrS, Bell. 



1863. Bell, Monogr. pt. ii, p. 21 & pi. iv, figs. 9-11. 



Supplementary . — Carapace approximately hexagonal in out- 

 line, a fifth wider than long ; surface minutely and uniformly 

 granulated. Eostrum prominent, broadly triangular (with a 

 small tooth at the base on each side ?). Orbito-frontal border 

 slightly exceeding half the greatest width of the carapace. The 

 antero-lateral border bears four or five rather large marginal tuber- 

 cles, the last of which forms the prominent lateral angle. Postero- 

 lateral border nearly straight. Posterior margin not quite so wide 

 as the orbito-frontal. The areolar tubercles are somewhat smaller 

 than in any of the other species ; about fourteen occur on the dorsal 

 surface, and a series of five or seven crosses the cephalic area trans- 

 versely ; those upon the mesogastric and the cardiac lobes form a 

 median series, and a lateral row of three occurs upon the branchials. 

 The longitudinal carina, which gives the specific name, is in- 

 distinctly marked in many specimens. Orbits large, with two 

 notches in the upper and a large one in the lower margin. First 

 pair of limbs : — meropodite triangular in section, with acute spines 

 on the posterior angle ; carpopodite about as long as wide, tuber- 

 culated ; hand two-thirds of the width of the carapace in length ; a 

 double row of spines runs along the border and terminates at the 

 base of the fixed finger, and a single row occurs on the dorsal 

 surface ; fingers slender, half as long as the hand. Length of 

 carapace =15 to 25 mm. 



Bistrihution. — Cambridge Greensand and Gault of Folkestone. 

 About thirty specimens examined. Gault examples are in the 

 British, Jermyn Street, and Woodwardian Museums. 



