344, 
ZOOLOGICAL LITERATURE. 
Trans, of Nortlmmb. & Diuham, p. 30 & 31, pi. iv. fig. 14, from off* Tyne- 
mouth. 
LYNCEIDiE. 
Eurycereus cookii. King, Trans. Ent. Soc. N. South Wales, vol. i. p. 164, 
pi. xii., from rivers in the neighbourhood of Sydney. 
OSTRACODA. 
Prof. Claus lias communicated in Zeitschr. fur wiss. Zool. 
XV. p. 391, a memoir on the various changes that take place in 
the young Cypvis during the growth of the animal, from the time 
that it quits the egg to that of its attaining adult development. 
He traces the changes by aid of the exuviation of the growing 
animal, and finds that there are eight distinct changes in the 
course of development after the larva has quitted the ovum, of 
the period preceding which he has made no observation. 
In the first stage the shell (length 0T32 mm., height 0-999mm.) is unlike 
that of the adult, being broader in proportion to its length, as 4 : 3 j it is 
extremely delicate and already minutely dotted and porous, having four 
muscular impressions on each side. The appendages at this time are three 
pairs (the two pairs of antennae and the mandibles), all of which appear to 
be used exclusively for locomotion. The animal now closely resembles the 
Larva of Naujfiim among the Copepoda. Tab. xxviii. fig. 1. 
In the second stage the shell (length 0*16 mm., height 0T15 mm.) has 
increased in length, is still delicate, but already a little calcareous, with 
thickening edges. The alimentary canal is visible in the entire length, but 
without the liver-lobes. The stomach is round. The antennae have not 
•altered much ; but the molar process is developed at the base of the mandi- 
bles, and the first pair of maxillae and the first pair of feet have made their 
appearance in a rudimentary form. Eig. 2. 
The third stage. The shell (length 0*18 mm., height 0*133 mm.) passes 
nearer to the form of the Cgpris, without altering niuch that of the appen- 
dages, the greatest alteration being the increased development of the maxillae 
and the appearance of a branchial lamina. Fig. 3. 
Fourth stage. The shell (length 0*23 mm., height 0*16 mm.) shows a con- 
siderable indentation of the ventral mai'gins. The maxillae have made the 
greatest advancement, and the second pair present themselves much as the 
first appear in the second stage. Fig. 4. 
Fifth stage. The shell has attained a length of 0*28 mm., height 0*18 mm . ; 
all the appendages approximate nearer to the adult form ; and the last 
pair of feet have made their appearance in the form of a delicate sac, and 
resemble an early stage of the maxillae. Fig. 6. 
In the sixth stage the shell is in length 0*35 mm., height 0*215 mm. j it 
exhibits a few hairs on the surface, and all the appendages have increased 
in length and adult characters. Fig. 6. 
In the seventh stage the shell in length is 0*45 mm., and in height 0*28 mm. 
Now the pleon (or, more correctly, the furcal appendages, which certainly 
homologize with a pair of the pleopoda, and may be the posterior or uropoda) 
makes its appearance. Fig. 7. 
