BXPIv ANATION OF PLATE XVII. 



Gobius ostreicola, Chaudhuri. 



Fig. i. — Ovum attached to a dead Oyster shell. 

 ,, 2. — Lateral view of the embryo, inside the egg-membrane. 



rt=eye; è=continuous fin; c=notochord; <i=ear; e=beginning of 

 nervous system; /=heart ; g=egg-membrane; Ä=pedicle; i=fila- 

 ments; ;=yolk. 

 ,, 3. — An empty egg-membrane attached to the shell by means of filaments. 

 ,, 4. — Ventral view of an embryo slightly older than the one seen in fig. 2. 

 ,, 5. — Lateral view of the embryo, showing a heterocercal tail. 



#=heart; &=two streaks of chromatophores lying above and beneath 

 the notochord; c=posterior portion of the notochord; d=jd\k ; 

 e=eye; /=pre-anal fin ; g=anus. 

 ,, 6. — Dorsal view of a slightly older embryo. 



a=gas-bladder ; 6=pectoral fin ; c=tail curved ; d=yo\k. 

 ,, 7. — Dorsal view (diagrammatic). 



<2=pectoral fin (fan-shaped); b=two streaks of chromatophores; 

 c=caudalfin; d=dorsal fin ; e^- chromatophore ; /=gas-bladder. 



Petroscirtes bhattacharyae, Chaudhuri. 



Fig. 8. — Lateral view of the smallest specimen at stage I. 



a=opercular spine; ô=pectoral fin; c=anus; ^=notochord ; e = 

 dorsal fin-fold; /=caudal fin-fold; g=ventral fin-fold; Ä=chro- 

 matophores. 

 ,, 9.-— Dorsal view of the medium-sized specimen at stage II. 



a=frontal prominence; è=narial tentacles; c=eye; <i=operculum; 

 ß=opercular spine; /=pectoral fin; g=brain; Ä=dorsal fin; i = 

 dorso-lateral (paired) membranous fin-fold. 

 „ 10. — Lateral view of the largest specimen at stage III. 



a=eye; 6=frontal prominence; c=mouth; <i=opercular spine; e= 

 operculum; /=pectoral fin; g=pelvic (ventral) fin; Ä=dorsal fin; 

 î = myotome; /=longitudinal horizontal septum; &=anal fin; /= 

 dorso-lateral membranous fin-fold; m=caudal fin. 

 „ 11. — A portion of the dorsal fin with its left membranous fin-fold. 



tf=myotome; b =longitudinal horizontal septum ; c= conical muscular 

 process; d=spine (unsegmented fin-ray); e=left membranous fin- 

 fold; /=pigrnents; g =epiaxial portions of myotomes; A=dorsal fin. 



