Geology and Natural History. 231 
wy other Cladocera, and Moe 2 through a marked post-embryonal 
amorphosis. In the earliest observed stage of the young of 
this form, the body is obovate. wholly without segmentation, the 
compound eye wanting, while there is a simple eye between the 
bases of the genres: the swimming arms (antennze) well devel- 
oped, and the airs of legs represented only by minute pro- 
on id 
ceans, although these append ee ae always been supposed to 
be wanting in the species of Clado Two subsequent stages, 
Belge approaching the adult fofoh are described. e adults 
m the winter-eggs have no vestige of the mandibular palpi left, 
subje ect of a very elaborate ir by Prof. Weismann of Frei- 
burg (Uber Bau und Lebensomsheliongen von Leptodora hyalina, 
Zeitschrift fir wissensch. Zool., xxiv, Sept., 1874, fattay devel 
8. Be 
0. Development of the European Lobster.—Dr. Sars has also 
Brot published, in the Proceedings of the same Society for 
1874, a paper of 27 pages, illustrated by two autographic plates, 
fs 
on the t-embryonal development of >the European lobster 
Homarus vulgaris He des ures in detail 
the three larval stages corresponding precisely with the first three 
stages which I ha bed in ric obs 
agreement in the nln at Sart we ha each arrived, and to the 
Saran opportunity afforded for a careful comparison of the 
early stages of eh a closely iy aang Althou ne the 
the differences appear greater in the larval stages than in the 
ea Dr. Sars was not able to trace the development beyond 
last pee of the larva, but after comparison with the later stage 
of the American lobster he regards it as quite probably ¢ be = 
true larval stage, 
Journal, vol. iii, pp. 401-406, plate tx, June, 1872, and Transactions 
Cbaanicieek Academy, vol. ii, pp. 351-381, plates XIV-XVI, August, 1873. 
