EMBRYOLOGY GEOGRAPHICAL DISTRIBUTION. Griist. 10 
each other in the sariie fish. These observations have been made in 
Cymothoa oestroides (Risso), Nerocila hivittata (Risso), and Anilocra 
mediterranea (Leach). In some allied genera, which do not fix themselves 
for their whole life on the same fish, as Cirolana and Conilera, males and 
females are quite distinct, but at the end of the ovary there is a filiform 
appendage resemblin'? a rudimentary vas deferens. 
J. C. ScHioDTE publishes preliminary notes on the propagation, meta- 
morphoses, and moults of the CymothoidcB ; in many of them, especially 
those that are aberrant, the young are very large in proportion to the 
adult, and not very numerous ; in others they exist to the number of 
2000, and are of extreme minuteness. C. R. Ixxxvii. pp. 62-55 ; also 
Ann. N. H. (5) ii. pp. 195-197. 
Observations on the first development of the egg in Cymothoa cestroides 
parallela, by J. F. Bullar, P. R. Soc. xxvii. pp. 284-286. The 
same on the egg of Balanus, by A. Lang, Jen. Z. Nat. xii. pp. 671-674, 
with 2 pis. 
Biology. 
S. JouRDAiN has observed remarkable changes in the colour of Nica 
edulis (Risso). It is commonly very pale brown, but becomes intensely 
red in the dark or when its eyes are destroyed ; the influence of light on 
the chromatophores is therefore not direct, but through the sense of see- 
ing ; in a cold temperature, approaching the freezing point, this change 
goes on very slowly. C. R. Ixxxvii. pp. 302 & 303 ; abstract in Natur- 
forscher, xi. p. 376. 
Note on stridulating Crustacea by J. Wood-Mason, Nature, xviii, p, 53. 
Stridulating organ in NeptimUs vocans, sp. n., by A. Miln e-Edwards, 
Bull. Soc. Philom. 1878, p. 6 \infra] ; in Palinurus vulgaris^ by T. J. 
Parker, P. Z. S. 1878, pp. 292, 442-444, pi. xx. \infrd\ 
The vitality of eggs of some Cladocera and Copepoda preserved, when 
frozen for a fortnight ; Norman, in Nares’s Narrative, &c., ii. p. 250. 
Geographical Distribution. 
(a) Freshwater Crustaceans. 
The geographical distribution of the freshwater crayfishes, especially 
the generic difference between those of the Northern and Southern hemi- 
sphere and their relative scarcity in tropical regions, is pointed out by 
Huxley, P. Z. S. 1878, pp. 762-765, 786-788. 
Yunnan. Four species of Telphusa and one of Faratelphusa, but no 
Macrurous Crustacean, collected by Anderson, described by Wood- 
Mason, 1. c. pp. 931-936 (previously described in J. A. S. B. xl. 1871, 
pt, 2). 
Mozambique. Telphusa ohesa (M. E.), Caridina nilotica (Roux), Vir- 
Uus sp. n., and Paloemon 3-4 spp. (the last ne r Tette), collected by W. 
Peters, MB. Ak. Berl. 1878, pp. 802, 828, & 837. 
Brazil. Note on the occurrence of Palccmon, Atya, and jPglea, in 
1878. [voL. XV. j B 16 
