DEVELOPMENT AND METAMORPHOSIS. 

 Fig. 38. 



93 



u: h. 



if i 



l. ctjr z 



Transformation of the mandible and hyobranchial apparatus of 

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

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

 dorsal view. Figs. 8 and 9 ventral view. 



as. Angulo-splenial bone. 

 bh. Basihyal. 

 cbr. Ceratobranchial. 

 ch. Ceratohyal. 

 d. Dentary bone. 

 fl. Lateral foramen. 

 h. Hyoidean cornu. 

 ha. Convex surface by which 

 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. 

 p>al. 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. 

 if. Thyroid foramen. 

 v. Ventral splint-bone. 



