some British Fossil Crustacea. 179 
pair of legs closely scabroso-punctate ; chelz oval, very slender, 
about double the length of the carapace, not very unequal, 
greatest width about half the length from the base of the little 
finger to the carpus ; section subrhomboidal, outer angle ob- 
tusely carinated, smooth, sides obtusely rounded in the mid- 
dle, inner edge with two rows of about four large spiniform 
tubercles arched forwards ; fingers about one-third longer than 
the base, equal, subcompressed, rounded, straight and of nearly 
equal width throughout, nearly smooth, with a raised line of 
very minute teeth on the mner edge; carpus small, section 
oval, scarce half the length from its tip to the base of the 
moveable finger, finely punctured, and'with a few strong 
spines ; arm compressed ; the other legs slender and nearly 
smooth (third and fourth pair | line in diameter). 
This species is much more common in the London clay than 
the H. gammaroides (M‘Coy), which it resembles, although only 
half the length ; it may be distinguished therefrom by the finer 
and more uniform granulation of the sides, the greater length of 
the nuchal furrow, and its being placed farther back towards the 
posterior margin ; the cheeks, mstead of being strongly carmated 
and spined, are only obtusely rounded and nodulated; the 
chelz are more slender, and the segments of the abdomen differ 
in the present species, having the anterior smooth portion of each 
more convex and separated by a much deeper furrow from the 
posterior part, which in the H. gammaroides is closely punctate 
in the first segment only, the others being polished with compa- 
ratively slight distant puncta, while in the H. Belli the hinder 
parts of all the segments are equally rough with a coarse close- 
set punctuation. 
I dedicate this species to Prof. Bell, from whose able pen we 
may one day expect an illustrated volume on all the crustacea of 
the London clay, for which I believe the most ample materials 
exist in metropolitan collections which will be at his disposal. 
Mr. Morris, in the preface to his Catalogue, mentions in the ca- 
binet of Mr. Bowerbank alone, the perfectly astonishing number 
of twenty to thirty species from this formation. Upwards of a 
dozen beautifully perfect specimens of this species were most 
obligingly sent me by Mr. Wetherell, on our mutual friend Mr. 
Yates mentioning that I was about describing the species from 
the Cambridge specimens, but was very anxious to render my 
specific description complete by the inspection of more perfect 
specimens. Mr. Bowerbank also lent me charming specimens 
with the same object. 
Common in the London clay of Sheppey, Hampstead, Bays- 
water, Primrose Hill, &c. 
(Col. University of Cambridge, Mr. Bowerbank, Mr. Wetherell, 
&e.) 
12 
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