The Pliaryngeal Pouches in the Mammalia 249 



D. Pr., dorsal prominence of tonsillar fold. 



E. Au., external auditory tube. 



F. Pc, fundus prsecervicalis. 



Fl. P., filiform appendix of 2d pouch. 



F. Pc. v., ventral portion of fundus prjecervicalis. 



G. Au., auditory ganglion. 

 G. Ep., glosso-epiglottic fold. 

 G. Gas., Gasseriau ganglion. 

 G. Gn., geniculate ganglion. 



Gl. T., glandule tliyroidienne, dorsal process of 4th pouch. 



G. Nod., ganglion nodosum. 



Hy., hyoid. 



Hyp., hypophysis. 



Impr., impressio cochlear is. 



I. Tu., incissura tensoris. 



La. T., lateral thyroid. 



M., mouth. 



M. Gr., median oral groove. 



Mck., Meckel's cartilage. 



Mk. F., Meckelian fossa. 



Mn. F., manubrial fossa. 



Ph. G. 1-4, pharyngeal grooves. 



Ph. P. 1-4, pharyngeal pouches. 



PI. B., postero-lateral border of the tympanic pouch. 



P-M. F., post-manubrial fold. 



P. PL, palatine constriction. 



P. R., recessus posterior of the tympanic pouch. 



Prom., promontory of the tympanic pouch. 



Ps. F., post-salpingeal fold. 



P. T. R., posterior tympanic margin. 



Pul., pulmonary artery. 



S-M. F., stibmeckelian fold. 



S. P., Seessel's pocket. 



S. Pc, sinus prjEcervicalis. 



S. Pi., sinus piriformis. 



S. R., recessus superior of the tympanic pouch. 



St., stomatodeum. 



S. T. P., sulcus tympanicus posterior. 



S. T. T., sulcus tubo-tympanicus. 



S. T. Ty., sulcus tensoris tympani. 



T. Ao., truncus arteriosus. 



Thr., thyroid cartilage. 



Th. S., thymus superficialis. 



Thy., thymus. 



Ton. F., tonsillar fold of the 2d pouch. 



Tr., trachea. 



Tub., tuberculum impar. 



