20 ME. J. CAETEE ON THE PALiEONTOLOGT OF [Feb. 1898,- 



Pterygostomate region large, granulated. Buccal orifice slightly 

 narrowed posteriorly. Sternum nearly twice as long as wide. 

 Episternum acutely pointed. Chelae equal, about one-eighth shorter 

 than the carapace. Dorsum of the hand considerably convex, 

 covered by small tubercles of various sizes, by the removal of which 

 the surface may be rendered pitted or reticulate ; palm flattened ; 

 fingers short, a third of the length of the hand; fixed finger reflexed; 

 carpopodite with a few coarse tubercles. Meropodite large, upper 

 face convex ; lower face flattened ; posterior border with a few 

 tubercles. Width of carapace = 15 to 24 mm. 



BemarJcs. — Dr. Woodward regards the Gault form as a distinct 

 species, and has named it D. feliceps. It is of smaller size than 

 D. Carteriaoia, but I do not recognize any characters by which it 

 can be distinguished. 



Distribution. — Eare in the Gault of Folkestone. In the Cambridge 

 Greensand it is less rare than was supposed by Bell. I have 

 upwards of thirty specimens of the carapace in m.j collection, and 

 others are in the British Museum, the Museum of Practical Geology, 

 and the museums of York and Polkestone. 



DiAiTLAx OwEia (BeU). 



1850. Flatypodia Oioeni, Bell, in Dixon, 'Geol. Sussex,' p. 345 & pi. xxxviii,* fig. 9.- 

 Supplementary. — Bell flgured a carapace, from the Chalk, which 

 he regarded as that of a species of Platypodia^ but he did not 

 describe it ; and, so far as I can ascertain, no description of the form 

 has yet been published. Specimens, evidently of the same species, 

 are in the British and Woodwardian Museums, but, unfortunately, 

 they are not sufficiently well preserved to admit of speciflc descrip- 

 tion. They are clearly referable to the genus Diaulax^ and" closely 

 resemble and may even be identical with D. Carteriana, but the 

 carapace is of considerably larger size than in the last-mentioned 

 species. 



Distribution. — Lower Chalk of Maidstone (Woodwardian Museum). 

 Chalk of Dover (British Museum). 



DiATJLAX, Sp. 



A single specimen of a carapace of a small species of Diaulax is 

 too imperfect for specific description. It is of interest as showing 

 the existence of the genus in the Tertiary period. Size of carapace : 

 width = 14 mm. ; length =10 mm. 



Distribution. — Middle Headon of Whiteclifl' Bay (Woodwardian 

 Museum). 



Genus Cyphonottjs, Bell. 



Cyphonotiis in"ceettjs, Bell. 



1863. Bell, Monogi-. pt. ii, p. 8 & pi. i, figs. 17-19. 



Supplementary. — The epigastric and mesogastric are the only 

 cephalic lobes which are separately definable. The scapular lobes 

 are more readily distinguishable. The transverse sulcus between. 



