39 2 



Memoirs of the Indian Museum. 



[Voi,. V, 1916.] 





skeletal structures of the pectoral, caudal, dorsal, and ventral fins takes place. The 

 ventral fin-fold persists, and the pelvic fin has not yet made its appearance. 



Stage) XIII (pi. xviii, fig. 6). The specimen measures 12 mm. in length. The 

 myotomes are fully developed, and more or less completely hide from view the organs 

 inside the body. The prolongation of the lower jaw as snout or beak becomes 

 quite a prominent feature, being just over ^ of a mm. in length. The pelvic fin 

 makes its appearance for the first time. The dorsal and anal fin-rays are well 

 developed. The dorsal fin contains 11 distinct and 2 or 3 indistinct fin-rays. The 

 anal fin contains 14 distinct fin-rays. The ventral fin-fold still persists though faintly, 

 but seems to be interrupted or folded up in the region of the pelvic or ventral fin. 

 The animal is now really a young fish in nearly all respects, and thus marks the 

 termination of the larval stage. 





