)7G 



B. F. Kingsbury and H. D. Kecd. 



of the two structures may be seen ij-ova the accompanying figures, 

 4-5. 



These fig-ures may be compared with the simiLir figures of the 

 36 mm. Triton larva (PL VII, Figs. 49 and 50). Fig. 4 may also 

 be compared with Fig. 41, Plate V, of Salamandra and Fig. 32, 

 Plate III, of transforming Amby stoma. 



Adequate descriptions of the "sound-transmitting apparatus" in 

 Diemictylus are lacking. Parker ('82a) describes the condition 

 in both larva and adult (pp. 179, 181), but each statement is brief 

 and without significance ; more significant is his comment when 



Fig. 4. 



Fig. 5. 



Fig. 4. Diemictylus viridescens, larva 37 mm. long. C, arteria carotis 

 interua ; C.I., caualis lateralis; Col., columella; G.p., cavum perilymphaticum ; 

 Cr.s., crista semicircularis ; O;;., operculum ; V.})-!., vena petroso-lateralis. 



Fig. 5. Diemictylus viridescens, larva 37 mm. long. C, arteria carotis 

 interna ; GoL, columella ; G.p., cavum perilymphaticum ; Op., opercul^um ; 

 V.p-L, vena petroso-lateralis. 



characterizing the skull of Spelcrpes (See foot-note on p. 578). Cope 

 ('88) is not suffiqiently detailed and Wiedersheim ('77) does not 

 particularly emphasize the relations in this portion of the skull of 

 Diemictylus. 



Plethodontidae. 

 Representatives of all the genera of this family have been exam- 

 ined as follows : Batracoseps, Hemidactylium, Manculus, and Auto- 

 dax, the adult stage only ; Gyrinophilus, Plethodon, and Stereochilus, 

 both larva and adult; Spelerpes, adult and a series of twelve devel- 

 oj)mental stages of larvse from 15 to 55 mm. in leng-th. 



