XVII ELASMOBRANCHII—HOLOCEPHALI 471 
transverse ridges, and no doubt belonged to a Japanese Chimaera.' 
In neither egg-case was there any trace of tendrils. The eggs 
probably lie on the sea-bottom, or, when the cases have styliform 
prolongations, it is possible that they are implanted in the ooze. 
Callorhynchus (Fig. 269) is distinguished by a singular pro- 
longation of the rostrum, which terminates in a downwardly- 
directed cutaneous flap, evidently from its abundant nerve- 
supply an important tactile organ. 
A frontal clasper is present in 
the male. The prolonged caudal 
axis 1s up-tilted, and the tail is 
more distinctly heterocercal than 
in Chimaera. The only species, C. 
antareticus, is confined to the Ant- 
arctic basin and the South Pacific. « 
The egg-cases of Callorhynchus 
differ considerably from those of 
Chimaera, and so large are they 
that one may measure 25 cm. in 
length, or nearly: as long as the 
abdominal cavity of the Fish. Each 
case is ovoid in shape, surrounded 
by a wide flat margin which is 
covered on one side with yellow 
hair-like fibres, thus giving to the 
case a protective resemblance to a 
mass of seaweed (Fig. 270). In Fic. 270.—Egg-case of Callorhynchus 
Piercentralpart.of the case there, .727e@eus laid open to show the 
embryo and its lobed yolk - sac 
is a pear-shaped cavity in which (y.s) 3 s, dorsal spine. (Cambridge 
the egg or the embryo is contained,  “se™) 
From one end of this cavity a passage, guarded by a valve, leads 
to the exterior, and provides for the escape of the young. While 
in the egg-case the nearly ripe embryo has long external gills, 
and its body is nearly sessile on a large and singularly lobed 
yolk-sac. 
The third genus, Harriotta (Fig. 271)” is remarkable for its 
1 See also an account of the egg-case of a Chimaeroid dredged from a depth of 
516 fathoms in the Bay of Bengal (Wood-Mason and Alcock, Ann. Mag. Nat. 
Hist. (6) viii. 1891, p. 21). 
2 Goode and Bean, op. cit. p. 32. 
