Im^'. 





DEVELOPMENT AND METAMORPHOSIS. 

 Fig. 38. 



3. 



93 



Transformation of the mandible and hyobrancliial apparatus of 

 Pelodytes punctatus. (After Eidewood, ' P. Z. S.,' 1897.) Nine 

 different stages, No. 9 representing the adult. Pigs. 1 — 7 

 dorsal view. Figs. 8 and 9 ventral view. 



as. Angulo-splenial bone. 

 bh. Basihyal. 

 cbr. Oeratobranchial. 

 ch. Oeratobyal. 

 d. Dentary bone. 

 fl. Lateral foramen. 

 h. Hyoidean cornii. 

 ha. Convex surface by whicli 

 the ceratohyal articulates 

 with the palato-quadrate 

 cartilage. 

 hbr. Hyobranchial plate. 

 hgs. Hyoglossal sinus. 

 m. Internal or mesial part of 

 the mandibular cartilage. 



m'. Lateral part of same. 

 mm. Mento-Meckelian (symphy- 

 sial) bone. 

 pa. Anterior process. 

 pal. Antero-lateral process. 

 ppl. Postero-lateral process. 

 s. Space enclosed between the 

 hyobranchial plate and 

 the proximal ends of the 

 first and second cerato- 

 branchials. 

 sp. Spicules of branchial arches. 

 t. Thyrohyal. 

 tf. Thyroid foramen. 

 V. Ventral splint-bone. 



