CRUSTACEA* 
533 
Zool. Record, vol. iv. pp. Oil & 020) is translated in Ann. & Mag. Nat. Hist, 
ii. pp. 133-138, pi. 1. figs. 18-22. 
SIPHONOSTOMA. 
Lern( 2 a hranchialis. Its metamorphosis has been described 
by C. Claus, partly from observations on living animals made 
by Dr. Metzger. The young live on the gills of Pleuronectes 
jlesus, and are free in their first stage, with two pairs of an- 
tennfE, the second pair being prehensile, two pairs of feet, and a 
caudal furca fringed with bristles (pi. 4. fig. 4) ; soon they attach 
themselves by a frontal process, the bristles of the furca are 
lost, but the number of feet increases in subsequent moul tings 
to four pairs. In this state they grow considerably, and the 
testicles or ovaria make their appearance (pi. 4. figs. 6, 9, II, & 
13). Then follows a second period of free life, in which the 
bristles of the furca reappear, and the two sexes approach each 
other. In this state the female is distinguished by a much 
longer tail from the male, but otherwise the size and shape of 
both is not very different ; the antennse are still the same as in 
the former stages (pi. 3. figs. 3, 4, & 5). Finally the female 
fixes itself on the gills of the Codfish, loses the antennie, feet, 
and caudal furca, whilst the three frontal horns are developed. 
It coils its body up in the well-known manner, develops eggs, 
and becomes the worm-like creature known as Lern< 2 a hran- 
chialis (pi. 3. figs. 6-7). Nearly the same observations are 
contained in the paper by A. Metzger, Wiegm. Arch. 1868, pp. 
I06-II0. 
Lcrnmocera esocina (Herm.), from the gills of the pike; the 
different stages are described and figured by Claus (ibid.), 
pi. I & pi. 2. figs. I, 2, 8. The young has the same two pairs of 
antennae, three pairs of feet, and a caudal furca, of which each 
branch is provided with one long and several short bristles ; but 
the two pairs of horns or arms which persist in the adult animal 
are already present, only proportionally smaller, in the young. 
CIIIRIPEDIA. 
Balanid.®. 
Fritz Mueller’s interesting paper on Balanus armatus, sp. n., and on a 
hybrid between this species and B. improvmis, var. assimilis (Dana) (see 
Zool. Record, vol. iv. pp. G21, G22) is translated in Ann. Si Mag. Nat. Hist, 
i. pp. 392-412, pi. 20. 
Suctoria. 
He.sse’s descriptions of SaccuUnidia gibhsii and S. horhstia-nodosa (see 
Zool. Record, iv. p. G22) are translated in Ann. & Mag. Nat. Hist. ii. 
p. 234. 
