64 



DAVIDSON BLACK 



5>>Si^ ,ArJurj. 



descTJnrf. 



Fig. 1 Damoniasubtrijuga. Transverse section through medulla just caudad 

 of the calamus. Abbreviations: Ar. fun., funicular area; C.c, canalis centralis; 

 F.ljn., fasciculus longitudinalis medialis; F.s., caudal extension of fasciculus 

 solitarus; Nu. c. vent., nucleus cornu ventralis; Nu. X. m., motor vagus nucleus; 

 Nu. XII., nucleus hypoglossus; R. desc. V. rm., descending trigeminal root chiefly 

 composed of fibers from the ophthalmic and maxillary divisions (rostromaxillary) 

 of this nerve (V. Valkenburg, 40); R. XII., hypoglossal rootlet. 



Fig. 2 Damonia subtrijuga. Transverse section through the medulla near 

 the rostral end of the motor vagus nucleus. Abbreviations: Fib. sec. X., second- 

 ary vagus fibers from the dorsal visceral nucleus (Kappers, 33); F. s., fasciculus 

 solitarius and associated gray which is of considerable size at the level (the de- 

 scending nature of the fasciculus is more apparent here than at the same level 

 in Amphibia); R. desc. V. md., descending trigeminal root chiefly composed of 

 mandibular fibers, many of which terminate in gelatinous gray abutting upon the 

 visceral sensory VII-IX area (V. Valkenburg, 1. c); R. X. m., vagus motor 

 rootlet; Vent. IV., fourth ventricle. Other abbreviations as before. 



