116 Scientific Intelligence. 
Peninsula; The Greek Peninsula. Mr. Henfrey has availed himself 
of all that has recently been written on this class of subjects, has care-. 
fully digested and systematized it, and presented it in a clear and suc- 
cinct manner. A. G 
6. Conspectus of the Crustacea of the Exploring Expedition under 
Capt. C. Wilkes, U. S. N.; by James D. Dana.—PAGURIDEA, 
continued, MEGALOPIDEA and MACROURA, (Proc. Acad. Nat. 
Sci., Philad., 1852. pp. 6-28.)—-The genera of Paguridea described 
in this paper have already been mentioned in this Journal.* . The fol 
lowing are the observations on the Megalopidea, together with the de- 
scriptions of the new genera, omitting those of the species. 
MecaLopipEa.—The question of the maturity or immaturity of the 
Megalope and that of their true place in the natural system, still re- 
main in doubt. Without touching on these points, at this time, I pro- 
legs; and in their habits. The beak is either horizontal or flexed lown- 
ward, and has usually a sharp prominent tooth, either side of it, exte- 
= 
tinct sets of species—the M. Montagui and armata for which it was 
te 
bi 
