472 Stimpson on the Crustacea and Echinodermata 
riorly. There may be either several small granules or one 
large one only, on the margin between the posterior teeth. 
Upper California, ( Nuttall.) 
Mus. Phil. Acad.; Smithsonian. 
DECAPODA ANOMOURA. 
Trinr LITHODEA. 
CRYPTOLITHODES TYPICUS. Brandt. 
Plate XX. 
Cryptolithodes typicus, Branpt; Bulletin physico-mathém. de l' Académie de St. 
Petersb. 1849, vii. 175. 
As Bnaupr's description of this remarkable crab is unac- 
companied by a figure, and very short, —the general charac- 
ters of the clypeus, rostrum, and antennary appendix only 
being given,—I take the present opportunity of presenting fig- 
ures, and a detailed description, drawn up from a specimen (a 
female) sent in a dried state to the Smithsonian Institution 
by Mr. Taylor of Monterey. As the dismemberment of 
this most rare and unique example would be by no means 
desirable, the details of the inner maxillipeds, and of some 
other less conspicuous appendages, cannot be here given. 
The most striking characteristic in this species is the 
great development of the carapax, which forms a broad, 
thin shield, of very uneven surface, completely hiding the 
legs, antennz, abdomen, and all the inferior parts of the 
body. These parts, therefore, which form a great portion 
of the bulk in most crabs, seem here, when viewed from 
below, to be placed in the bottom of a cup-like cavity. This 
arrangement would lead one to refer the species to the 
Cryptopodiacee, to which family however it has no resem- 
blance in its other characters ; the structure of the antenn?» 
the position of the eyes, and the concealment of the posterior 
pair of feet at once distinguishing it. 
