34 



CHIM^EROID FISHES AND THEIR DEVELOPMENT. 



the last regard it differs again from the capsule of fig. 1 5 E, in which the portion of 

 the web in front of the opercular hinge is far more transparent than the posterior 

 portion. Again, the capsule of fig. 1 5 c, although somewhat resembling that of fig. 

 1 5 B, differs notably in proportions ; thus, the tail-sheath is relatively longer. The 

 capsule is also much lighter in substance. A sixth and final capsule, fig. 1 5 F 

 (Australian), one of several specimens in the British Museum, presents additional 

 differences. It is much broader than the rest, and is notably deficient in rugulae.* 



I 5 D 



Fig. 15 D. Egg-capsule of Callorhynchus. (Martinez.) From Chile. (Ventral aspect.) One-half actual size. 



Fig. 15 E. Egg-capsule of Callorhynchus. (Savatier.) From Magellan. (Ventral aspect.) One-half actual size. 



Fig. 15 F. Egg-capsule of Callorhynchus. (British Museum.) From Australia. ( Dorsal aspect.) One-half actual size. 



Specimens similar to the last mentioned appear in the museums of Copenhagen 

 and of Harvard University. 



Other Callorhynchid capsules include a fossil one, ' 'Aletodus" (Ischyodus), and 

 one of the curious elongated forms from the middle Pacific, which has recently 

 been described by Carman. The first (fig. 13), lately discussed by Jaekel, 

 proves so similar to the foregoing recent capsules that one may doubt the propriety 

 of regarding it as having belonged to a separate genus. The second, Carman's cap- 



*The specimens, four in number, in the British Museum, are essentially alike ; two were collected near Dunedin, 

 two near Hobart (mem, kindly furnished by Mr. Boulenger). 



