some British Fossil Crustacea. 17] 
nuchal suleus ; pterygostomian regions marked with large lon- 
gitudinal furrows and a few rows of sharp granules ; surface 
minutely granulated. Length from 9 limes to 14 inch. 
I suspect that the figures in Mantell’s ‘ Geology of Sussex,’ 
t. 29. figs. 15 & 16, and possibly 9 & 10, may belong to this spe- 
cies, though rather more elongate than the specimens I have 
seen. The N. Bechei (Deslong. sp.) 1s broader, more quadrate, 
and has vertical rows of tubercles on the branchial regions. I 
have a sincere pleasure in dedicating this species to the indefa- 
tigable geologist, who in one of the earliest of his many valuable 
geological works, has given the only figures I believe extant of 
all the species of the genus. 
Not uncommon in the greensand of Lyme Regis and in the 
gault of Folkestone. 
(Col. University of Cambridge.) 
Pagurus? platycheles (M‘Coy). 
Sp. Char. Hands nearly equal, very much compressed, broad 
ovate, width nearly three-fourths the length, the moveable 
finger little smaller than the other; carpus trigonal, not so 
long as wide ; surface closely covered with very obtuse granules 
of unequal sizes. Length of left hand 10 lines, of right hand 
8 lines ; width of left hand 7 lines, of right 5 lines ; length of 
carpus 4 lines, width nearly 5 lines. 
One interesting specimen in the collection at Cambridge shows 
the two strong crustaceous hands zn situ, while all trace of the 
body and abdomen -have disappeared, which could scarcely have 
happened unless, as in the recent Hermit Crabs, those parts 
were almost momberoue close under the right hand is a 
clear sparry cavity apparently indicating the place occupied by 
the soft perishable abdomen. The granulation of the surface 
resembles that of an Hchinus. The species is remarkable for 
the width and brevity of its hands and wrists. 
Not uncommon in the great oolite of Minchmhampton. 
In connection with the group Anomura I may say a few words 
on a crustacean described and named Ammonicolax longimanus 
by Mr. Pearce (see Annals for September 1842), which he sup- 
posed to form a new genus of Hermit Crabs inhabiting the 
Ammonites. It seemed to me very incautious to infer that the 
Ammonicolaz lived in the Ammonites on no better ground appa- 
rently than their co-existence m the Oxford clay at Christian 
~Malford, and on recently examining two authentic specimens 
presented by Mr. Pratt to the University collection at Cambridge, 
I found that so far from being anomurous, the species had a well- 
