140 BULLETIN OF THK ESSEX INSTITUTK. 



r. Uostrmn. 



r I. Foramen foi* ramus lateralis facialis iif the seventh nerve. 



r m. Foramen for ramns maxillaris of fifth nerve. 



r n. Foramen for ramus mandibularis of fifth nerve. 



r p. Foramen for ramus ophthalmicus profundus of fifth nerve. 



7' p i. Foramen for ramus palatinns inferior. 



r p s. Foramen for ramus palatinus superior. 



r s. Foramen for ramus ophthalmicus superficial! s of fifth. 



s. Stapes. 



s b. Supraorbital hand. 



sp. Stapedial process. 



s t. Synotic tectum. 



s n. Support of balancer. 



t. Trabecula. 



t a. Tympanic annuUis. 



t c. Tegmeu cranii. 



t e. Tectal cartilage. 



t in. Taenia tecti medialis. 



tr c. Trabecular crest. 



V. Foramen for branch of fifth nerve. 



vii. Foramen for branch of seventh nerve. 



viii. Foramen for branch of eighth nerve. 



V p. Ventral na.sal process. 



V r. Ventral trabecular rod. 



EXPLANATION OF PLATE. 



Fig. 1. Side view of model from Amblystoma punctata, ten mm. 

 long. 



Fig. 2. Dorsal view of same. 



Fig. 3. Dorsal view of •inoAel fromAmblyatoniapunctata, eleven mm. 

 long. 



Fig. 4. Side view of model from Amblyatoma punctata, twelve mm. 

 long. 



Fig. 5. Dorsal view of same. 



Fig. (). Ventral view of same. 



Fig. 7. Dorso-midian view of otic capsule of same. 



Fig. 8. Side view of model from Amhlyntoma jeffersoniaiia, thirty- 

 nine mm. long. 



Fiii. 9. Dorsal view of same. 



