426 Scientific Intelligence. Z 
side, so that the true apical margin slopes backward and outward. The 
fourth joint is articulated with the same part normally in both, and the 
only difference is in the greater or less inclination of the summit mar- 
gin, when greatest it approximating to longitudinal. The little import- 
ance of the distinction based upon the maxillipeds among the Cancroidea 
as well as Maioidea is shown by numerous instances. Even the single 
science. e have admired the wonderful fidelity of his plates, the 
in the order, as far as we can judge, of their relative bearing upon the 
or less prehensile,as in Dromia,and that the vulvz have the same position 
as in that genus (in the base of the feet of the third pair); and he therefore 
places the genus in the Dromia group. Still, in the number of branchie 
and some other characters, it is like the Maiinea, and it is properly an 
intermediate type. The outer antenne are peculiar in being free and 
cylindrical from the very base, with the second joint much longer than bj 
the first, nearly as in the Dromiacea. These last facts with re ard 
ile, somewhat Dromia-like, although they are not at all dorsal 
and also resemble the preceding legs. The genus referred to is ci- 
nopus of De Haan. It is apparently intermediate in character between 
the Maia tribe and Latreillia. es 
- » aberrant form, Oncinopus, (and also Latreillia, if it be not thrown 
with the Dromiacea,) will naturally belong toa distinct group, and we 
therefore divide the Maioid Crustacea into three tribes, Mammza, ONcI- 
NINEA and ParTHENOPINEA. “ ae oe 
The Parthenopinea have the basal joint of the outer antenna usually 
not 
beyond t 
andfreeo 
