162 Prof. F. M‘Coy on the Classification of is 
de Normandie, Morris’s Catalogue, &c.), and some similar forms 
from the gault, form a peculiar genus intermediate between Ho- 
mola and Corystes, and belonging not to the Brachyura but to 
the Anomura, for which I have proposed the name Podopilumnus. 
3. Inachus : Desmarest (Crust. Foss.), Morris (Catal.), and seve- 
ral other authors have quoted a species of this genus as found 
fossil in the London clay :—the figures and descriptions which 
I give below, from the abundance of perfect specimens which I 
have examined, leave no room for doubt that the fossil in question 
does not belong to the Brachyura but belongs to the Anomura, 
and forms a particular genus allied to Notopus, Dorippe and the 
like, to which I have given the name Notopocorystes. 4. Corystes ¢ 
(Latreille): the gault fossils referred to this genus in Morris’s 
‘Catalogue’ belong to the same Anomurous genus as the so- 
called Orithya. 
Zanthopsis (M‘Coy), n. g. 
Gen. Char. Carapace suborbicular or transversely oval, gibbous, 
strongly arched from before backwards; gastric region very 
large, tumid, depressed in the middle towards the insertion 
Diagram of the genus Zanthopsis. 
a. Entire animal as far as known; 0, view of the front from below, showing 
the internal antennz lodged in their transverse fossze, and the position 
of the outer pair in the inner canthi of the orbits ; c, abdomen of female, 
nat. size; d, ditto of male, nat. size. 
of the genital region, which is very small, pentagonal, and not 
extending more than one-third the length of the carapace to- 
wards the front, generally divided by a transverse depression 
into two portions, the hinder of which is most prominent and 
equal in width to the cardiac and intestinal regions, which are 
longer than broad, and form together a tumid ridge of three 
