[121] 



EMBRYOGRAPHY OF OSSEOUS FISHES. 575 



pc. post-cardiac membrane. 

 pv. muscle plates ; protovertebrae. 

 pn. pineal gland. 



pr. protoplasm; protolcncite; germinal pellicle. 

 pr7i. nodose protoplasmic processes from the edge of the germinal dibk. 

 jmp. pronephros. 

 j)i. pigment cells. 

 pst. medullary pl.ate. 

 pf. pectoral fold. 



r. rim of blastoderm, 

 St', sinus venosus. 

 B. ep. sensory layer of epiblast. 

 «/i. sensory hillocks or papillae of lateral line. 

 ag. segmentation cavity. 



8c. segmenting corjjuscles f 



at. subnotochordal strand of mesoblastic cells ; in part the postanal gnt. 



8. sagitta. 



t. tongue. 



V, vent. 

 ve. ventricle. 



vt. vitelline membrane; egg capsule. 



ra, vesicles imbedded in the germinal pellicle. 



w. posterior wall of pericardiac cavity. 



y. rudiment of air bladder and dorsal lobe ol the liver. 

 yh. yelk blastopore. 

 yc. yelk canal. 



