548 ME. J. CAETER ON THE 



Eetma Yilleesi, Mor. (PI. XYI. fig. 3.) 



Eryma Vilhrsi, ]\ioriere, " Prem. Note sur les Cr. de I'Oxfordien 

 trouves dans le Calvados," Bull. Soc. Linn. jSTorm. ser. 3, t. vi. 



pi.i. 



" Chelse of first pair robust ;" fingers long, slender, subequal in 

 size, rendered slightly sinuous in outline by a gentle longitudinal 

 double curvature ; subcompressed laterally (oval in section) ; surface 

 with depressed, small, regular tubercles, two or more diameters 

 apart ; outer border of both fingers broadly rounded ; inner border 

 of fixed finger with a series of denticles, of which a few are raised 

 on a prominence near the proximal end ; a series of smaller size 

 occur between this prominence and a single large tooth about the 

 middle of the finger, beyond which the series is continued to the 

 distal end. 



The inner margin of the dactylopodite bears a row of denticles 

 unequal in size and rather larger than those on the fixed finger ; 

 those on the second proximal fifth of the dentary border are the 

 largest, and are opposed to the small denticles of the fixed finger. 



These chelae so precisely agree in character with those of the 

 specimen figured and described by M. Moriere from the Oxford 

 Clay of Calvados, that I do not hesitate to regard them as identical. 

 M. Moriere has figured a nearly perfect carapace with the first pair 

 of limbs in situ; he also figures (fig. 5) a portion of a long slender- 

 fingered chela which he is of opinion probably belonged to a 

 different species ; I have met with the same form amongst the 

 St. Ives specimens, and also with chelse almost identical with 

 those represented by fig. 2 in M. Moriere's plate. This distin- 

 guished palaeontologist apparently hesitates to separate E. ViUersi 

 from E. Baheaui ; both these forms occur at St. Ives, and I am 

 inclined to regard the difference of character as fully sufficient to 

 warrant specific distinction. 



Length of dactylopodite nearly 3 inches ; width of the distal end 

 of hand about J of an inch. 



Oxford Clay, St. Ives. 



Coll. Mr. George, Northampton, and my own. 



Specimens examined 8. 



Eetma Babeatji, Etal. Notes sur les Cr. .Jur. tab. viii. fig. 1 ; Oppel,. 

 Pal. Mitth. tab. x. fig. 3. 

 Several imperfect specimens have come under my notice which 

 so nearly resemble those of E. Baheaui that I provisionally refer 

 them to. that species, although they differ in some details from the 

 figures and descriptions given by Etallon and by Oppel. One rather 

 large specimen shows the distal end of the hand and the greater 

 portion of both fingers, which latter are more robust, but have 

 the graceful, falcate form expressed in the figure quoted. The 

 tubercles on the distal portion of the hand and on the fixed finger 

 are more crowded than in E. Baheaui as represented by Etallon 

 and by Oppel, being scarcely more than one diameter apart, but are 

 tolerably regular and uniform in size ; those on the dactylopodite 



