320 Henry L. Bruner 



naris; in the posterior portion of the lateral wall a small fenestra late- 

 ralis; and anterior to the last a fenestra rostro-lateralis', which contains 

 in its rostral end the external naris, in its posterior end the anterior 

 opening of the ductus naso-lacrymalis. Between the fenestra rostro- 

 lateralis and the fenestra dorsalis lies an oblique blade of cartilage 

 (cartilago obliqua, Co., Fig. 7), which springs from the anterior part of 

 the roof of the nasal capsule and terminates laterally in a cartilage 

 plate, the planum terminale [P.t.) of the cartilago obliqua. In a ventral 

 direction this plate is connected with the floor of the nasal capsule 

 by a narrow bridge, which separates the fenestra rostro-lateralis from 

 the fenestra lateralis. Caudalward the planum terminale extends to 

 the posterior wall of the nasal capsule and thereby separates the 

 fenestra lateralis and the fenestra dorsalis. 



The relation of the overlying skull bones to this cartilaginous 

 capsule may be briefly stated as follows: The fenestra ventralis is 

 closed excepting at the internal naris, by the vomer and palatine 

 process of the intermaxillare. The fenestra dorsalis is covered 

 caudally by the frontale, rostrally by the nasale; the fenestra late- 

 ralis is overlaid by the facial process of the maxillare, which also 

 extends forward and covers the posterior part of the fenestra rostro- 

 lateralis. Between frontale and nasale on one hand and the facial 

 process of the maxillare lies the prefrontale (fronto-lacrymale, lacry- 

 male of authors), which is perforated for the passage of the ductus 

 naso-lacrymalis (compare Fig. 3, PI. XVII). The facial portion of 

 the maxillare stops a short distance behind the external naris, which 

 is therefore bounded posteriorly by soft tissues only. This uncovered 

 portion of the fenestra rostro-lateralis, including the external naris, 

 is the apertura naris cranialis externa of my earlier paper (7) on 

 the nasal muscles of the Salamandrina. 



Each of the two nasal sacks of Triton is an undivided chamber 

 which shows in cross section a larger medial olfactory portion (iV.) 

 and a lateral respiratory portion or cavum maxillare [Cmx.]. These 

 two portions are separated in the roof of the nasal cavity by a 

 broad longitudinal thickening of the nasal wall, which extends from 

 the external naris to the anterior end of the planum terminale, where 

 it ends medial from the opening of the ductus naso-lacrymalis (see 

 Figs. 2 and 6, PI. XVII). This thickening (»Bindegewebswulst« of 

 Born [4], Riese [41] and Seydel [45]) lies for the most part within the 



1 The fenestra rostro-lateralis is the fenestra »rostralis« of my preliminary 

 notice in: Anatom. Anzeiger. Bd. XV. 1899. 



