CoGuHiLL, F2fth Nerve in Amphibia. 59 
stoma. The terminal branches of the ophthalmicus profundus 
in Rana, therefore, can not be homologized each to each with 
the terminal branches of that nerve in Amblystoma. 
6. Asa general conclusion from the above, there is no 
distinct maxillaris branch of the trigeminus in Amblystoma. 
The functions of that nerve are performed by the ophthalmicus 
profundus. 
7. The general cutaneous branch of the trigeminus asso- 
ciated with the buccal VII in Amblystoma corresponds to 
Strone’s lateral ‘‘accessory ramus’”’ in the tadpole. 
Brown University, 
April 3, 1901. 
DESCRIPTION OF PLATE V. 
Fig. 1. Projection, upon the horizontal plane, of the rami ophthalmicus 
profundus V and palatinus VII of Amblystoma tigrinum, to show the anasto- 
mosis between these nerves. 
Fig. 2. Projection of the same nerves of the larva of Rana together with 
the ramus maxillaris V, on the horizontal plane (after STRONG), to show the 
character of anastomoses as compared with that in Amblystoma. 
Fig. 3. Four transverse sections through the head of a tadpole of Rana, 
at a stage some time previous to the appearance of the hind legs. Drawn with 
the camera lucida to show the relations of nerves at various levels. 
Fig. 4. Four transverse sections through the head of Amblystoma tigri- 
num, drawn with the camera lucida, to show the relations of nerves as com- 
pared with Fig. 3. 
In Figs. 3, 4, ’ 
A. Near the anterior end of the Gasserian ganglion, to show especially 
the relation of acto m,dandg. Fig. 3A is immediately cephalad of the Gas- 
serian ganglion. 
B At the level of the passage of ac, 6 and around the anterior border 
of the ear capsule. - 
C. At the posterior level of the eye. 
D. At level of posterior end of internal nares. 
REFERENCE LETTERS. 
ac.—Ramus of the trigeminus which fuses with buccalis VII. 
6.—Ramus buccalis VII. 
c.—Brain. 
g.—Gassserian ganglion. 
7.—Eye. 
