CRUSTACEA. 
617 
BRANCHIOPODA. 
Phyllotoda. 
Metschnikow has studied the development of Nebalia. The 
nutritive part of the vitellus is separated quite at the commence- 
ment of the development, without participating in the segmen- 
tation of the plastic part as in Balanus and Basanistes, This 
genus does not appear to go through a remarkable metamor- 
phosis ; the changes consist merely in an evolution of the per- 
sistent form of the body and its parts. See the journal noticed 
above, p. COO. 
Branchipus. A. E. Venill distinguishes the following generic groups : — 
1. Branchipus, restricted. Male with stout, two-jointed claspers; female 
with large, thick, ovate egg-pouches ; a pair of simple appendages resembling 
antennae between the bases of the claspers in front. B. stagnalis (L.), spi- 
nosus (M.-Edw.), vernalis,^^. n., Massachusetts, and perhaps (Mid- 
dend.). 
2. Branchinccta. Claspers slender and simple, no appendages between 
them; egg-pouches elongated, with lateral lobes; branchial organs more 
elongated, the middle ones longest. Branchipus {Branchinccta) arcticus, 
sp. n., Labrador, Br. {Br) grccnlandicus, sp. n., Greenland, and B. ferox 
(M.-Edw.). Verrill ^‘prefers for the present to regard it as a subgenus of 
Branchipus^ 
3. Heterohranchipus, gen. nov. Claspers of the male very long, three- 
jointed, floxuous; external male organ very long, slender, curved, Bran- 
chipus cafer (Lov^n). 
4. Chirocephalus (Provost). Two long, ligulate fleshy processes, serrated 
on each side, coiled in a spiral beneath the head, between the claspers of the 
male, extended in copulation. C. diaphanus (Provost). 
Artemia gracilis, sp. n., found in a tube of water from the salt marsh near 
New Haven and Boston, and A. monica, sp. n., locality miknown; with some 
remarks on this genus generally, and ite occurrence in concentrated salt 
water. Verrill in Silliman’s Am. Journ. xlviii. pp. 244-249. A. fertilis, 
sp. n., Great Salt Lake, Verrill, ibid. p. 430. 
Cladocera. 
Notes on the development and structure of JDaphnia {longispina) and Bgn- 
ecus, by A. Dohrn. Jena. Zeitschr. f. Med. u. Naturw. v, pp. 278-292, 
pi. 10. 
Lyncem. The outer form and the anatomy of this genus have been studied 
by F. Plateau, M^m. Couronn^s Acad. Belg. xxxiv. (abstract in Ann. & 
Mag. Nat. Hist. iii. p. 13). 
OSTRACODA. 
Cypridid^. 
Cypris monacha (Miill.). The existence of males and females in this 
species has been observed by F. Plateau ; this agrees with the observations 
1869. [voL. VI.] 2 u 
