ORDER DECAPODA. 
167 
at its upper extremity, in the manner of a transverse and 
oblique lamina, closing the ocular cavities. The following 
articulation is inserted under its superior edge. The testa, 
seen above, appears, as it were, broadly truncated in front. 
Its anterior extremity is inclined, and is terminated by a sort 
of hood, or denticulated bill. ( Cancer cristatus , Linn.) 
Stenocionops, Leach , 
These are distinguished from all the subgenera of this tribe, by 
their long, narrow, ocular pedicles, projecting very much out 
of their lossets. ( Cancer cervicornis , Herbst.) 
Sometimes the under part of the feet presents neither ranges 
of denticulations nor fringes of hair, like a knob ; those of the 
first pair at least exceed the testa in length by one half, and 
often by a much greater proportion. The body is generally 
shorter than in the preceding, either globular, or in the form 
of a contracted egg. 
A crustaceum of this tribe (Maia retuja , Coll, du Jardin du 
Loi), whose testa is an ovoid, truncated, or blunted in front, 
and woolly ; whose ocular pedicles, elongated, and very much 
bent, proceed to lodge themselves behind, in fossets situated 
under the lateral edges of the testa ; whose carpus, as well as 
in the maiae, is elongated, offers another character which dis- 
tinguishes it exclusively : the length of the feet, beginning 
from the second, appears to augment progressively, or at least 
to vary but little. Dr. Leach has formed of it the genus 
Camposcia. 
In the others, as usual, the length of the feet diminishes pro- 
gressively, from the second pair to the last. 
We aie acquainted with some whose ocular pedicles, 
though much shorter than those of stenocionops, are always 
projecting ; whose lateral antennae have the third articulation 
