188 
ZOOLOGICAL LITERATURE. 
disk forward. While this extension is going on, the cerebral lohes change 
their position from beneath the optic lobes to one in front of them. 
(9.) Two anal fins, one quite large and the other very small, are developed, 
but both are afterwards wholly absorbed. 
(10.) The dorsals change position from the middle to the end of the tail. 
At the time of hatching, however, there is still a slender terminal portion of 
‘the tail, which is afterwards either absorbed or covered up by the enlarged 
dorsals, as they extend backward. 
Raja clavata. M. Gervais has observed a case of notomely in this species j 
the specimen had a pair of supernumerary pectoral fins on its back. Compt, 
Rend. 1864, ii. p. 802. 
V Pteroplatea marmoratay sp. n., Cooper, Proc. Calif. Acad. Nat. Sc. iii. p. 112, 
fig. 25, from the coast of California. 
^ Urolophus halleriy sp. n.. Cooper, Proc. Calif. Acad. Nat. Sc. iii. p. 95, 
fig. 21, from the Coast of California. 
V Trygonoptera javanica, sp. n.. Martens, Monatsber. Acad. Wiss. Berl. 1864, 
p. 260. The genus Trygonoptera (Miill. & Henle) was known from a draw- 
ing only ; Dr. von Martens, having discovered this second species, says that 
the teeth of this genus are not exactly acute, and that it has a rayed terminal 
caudal fin. 
Leptocardii. 
Myxine glutinosa. Prof. Steenstrup lias discovered a female 
I specimen, in which the eggs present a very different appearance 
^ from those hitherto found in these fishes, and are evidently 
in a state of maturity. They are proportionally much thicker 
\ and shorter, ovate in form, about 15““ long, and 8““ broad, 
I enveloped in a horny case which at each end is provided with 
I a bundle of short threads, each thread ending in a treble hook. 
I The eggs are attached to each other by means of these hooks, 
I and after being deposited they probably fix themselves by the 
\ same means to other objects. (Efvers. Dansk. Vidensk. Selsk. 
\ Forhandl. in 1863, pp. 233-238, with a woodcut. 
Branchiostoma lanceolatum. Prof. Steenstrup observes, with regard to the 
account given of this fish in the third edition of Yarrell’s British Fishes, 
1, that the specimen from the Moray Firth, stated to have been 7 inches 
long (p. 4), cannot have been a Branchiostoma y but was either a Leptocephalus 
morrisiiy or more probably a young Myxine ; 2, that the whole article of Mr. 
Wilde on the habits of this species, inserted on pp. 6 & 7, refers not to a 
fish, but to a Salpa, probably Salpa runcinata (Cham.). Ofvers. Dansk. 
Vidensk. Selsk. Forhandl. in 1863, p. 238. 
