The Smooth Facial Muscles of Anura and Salamandrina. 



361 



Int. Intermaxillare, 



Int.fuc. Pars facialis of the Intermaxil- 

 lare, 



Int.pal. Pars palatina of the Intermaxil- 

 lare, 



Int.dent. Pars dentalis of the Inter- 

 maxillare, 



Intr. Os intranasale, 



L.i. Lamina inferior, 



L.s. Lamina superior, 



M.c.n. Musculus constrictor naris, 



M.d.n. Musculus dilatator naris, 



3Ld.)i.a. Musculus dilatator naris acces- 

 sorius, 



M.l.s. Musculus labialis superior, 



M.S. Musculus submentalis, 



3Ick. Meckel's cartilage, 



JJx. Os maxillare, 



Mx.fac. Pars facialis of the maxillare, 



Mx.iUnt. Pars dentalis of the maxillare. 



N. Nasal cavity, 

 Nas. Os nasale, 

 Tl.o. Plica obliqua, 

 P.t. Planum terminale, 

 P.S. Pulvinar subrostrale, 

 F.m.d. Pars mentalis of the dentale. 

 Ff. Prefrontale (= Lacrymale Born), 

 Pr.p.i. Processus praenasalis inferior, 

 Pr.p.s. Processus praenasalis superior, 

 S. Loose syndesmoses (permitting mo- 

 vement], 

 S.7n. Sulcus marginalis, 

 Sept.nas. Septum nasale, 

 Sol.nas. Solum nasale, 

 Tect.nas. Tectum nasale, 

 T. Turbinal prominence, 

 T.c. Turbinal cartilage, 

 V. Vomer, 

 V.c.s. Vestibule of the cavum superius. 



Description of Figures. 



Fig. 1. Frontal section through the caudal half of the nasal muscle thickening 

 of Salamandra maculosa. Magnified 15 diameters. The section in- 

 cludes the musculus dilatator naris [M.d.n.) and the peripheral portion 

 of the median end of the constrictor naris [M.c.n.]. Between the dila- 

 tator naris and constrictor naris on the one hand, and the dilatator 

 naris accessorius [3I.d.n.a.) on the other, lie the tubules of the glan- 

 dula nasalis externa [Gl.n.e.]. 



Fig. 2. From Salamandra maculosa. Magnified 15 diameters. Frontal section 

 near the posterior end of the musculus dilatator naris [M.d.n.], and 

 through the opening of the ductus naso-lacrymalis [D.nl.] into the 

 nasal cavity. Outside of the duct lie tubules of the glandula na- 

 salis externa, which are covered by the facial portion of the ma- 

 xillare. 



Fig. 3. From Salamandra maculosa. Magnified 15 diameters. Frontal section 

 through the turbinal prominence which is supported by the turbinal 

 cartilage [T.c.]; the last is formed by the thickening and bending 

 inward of the lateral portion of the planum terminale. The ductus 

 naso-lacrymalis is passing through the prefrontale. 



Fig. 4. From Desmognathus fusca. Enlarged 22 diameters. Frontal section 

 through the posterior part of the fenestra rostro-lateralis, which is here 

 occupied by the os intranasale [Intr.]. The relations of the caudal 

 parts of the dilatator naris [3I.d.n.) and dilatator naris accessorius 

 [M.d.n.a.] are also shown. 



