SrSOXTjVS AND REFERENCES. 473 



" Eima ad infundibuli, s. vulva" — Various authors, according to Dunglison, A, 906. 



Mesal portion of the foramen of Monro — Balfour, A, II, 257. 



Mesal portion of the " ventriculus communis " — Stieda, 22, 453. 



Mesal portion of the " common ventricular cavity" — Spitzka, 6, 31. 



The aula is the most cephalic part of what ig commonly known as the third ventricle- 

 Its best defined portion lies between the two portse, and is bounded cephalad by the fornii 

 and caudad by the medicommissura. Ventrad it reaches the chiasma so as to include the 

 Recessus optici ; dorsad it is bounded by the triangular area of the fornix, called delta. 

 The form of the cavity is therefore peculiar and irregular. 



T7ie Name. — The origin of the name and the reasons for its use are briefly stated in 

 § 1065. Much remains to be done, especially in Comparative Anatomy and Embryology, 

 before the limits of this cavity can be well defined. 



§ 1186. Auliplexus, apx.—Fig. 113 ; § 1066. 



The aulic portion of the " plexus choroideus ventriculi tertii " or diaplexus. 



This portion of the plexus is so slight that it would hardly need a separate designation 

 but for the possibility that in the cat, as in Menobranchus, the larger diaplexus may be 

 only an extension of the more primitive auliplexus. 



§ 1187. Area cruralis (az.), Ar. cr.— Pig. 116, 118 ; PI. II, Fig. 3 ; PI. Ill, Fig. 11. 



A convenient name for the ill-defined and non-homogeneous area of the iasis encephali 

 bounded by lines projected laterad from the pons and chiasma. See Area intercruralis 

 (§ 1189). 



§ 1188. Area elliptica, Ar. el.— Fig. 116 ; PI. 11, Fig. 3 ; § 1140. 



According to the Am. Jour, of Neurology, etc. (I, 103), this is the surface of the oliva, 

 notwithstanding the funiculi of the If. hypoglossus emerge laterad of it instead of mesad 

 as in man. 



§ 1189. Area intercruralis {az), Ar. icr.— Pig. 116, 118 ; PI. II, Fig. 3 ; PI. Ill, Fig. 

 11 ; § 1133. 



Syn. — Interpeduncular space ; Area intercruralis (manuscript) — Spitzka, 7, 165. 



If the diverging fibrous tracts sometimes called peduneuU cerebri are to be called crura, 

 then the space bounded by them and by the pons and chiasma, should be intercrural 

 rather than interpeduncular. 



§ 1190. Area ovalis, Ar. ou.— Pig. 116 ; PI. II, Fig. 3 ; § 1140. 



The surface of an elevation of the ventro-lateral aspect of the metencephalon, lateral 

 of the Area elliptica. 



According to the Am. Jour, of Neurology, etc. (I, 103), this corresponds with the Tuber, 

 cle of Rolando, " tubereolo ciaereo." 



§ 1191. Area postpontilis (az), Ar. ppn.—Pig. 116 ; PI. II, Pig. 3 ; § 1133. 



The ventral aspect of the metencephalon. It includes the Area elliptica, the Ar. ovaliK 

 the pyramis and trapezium, and the ectal origins of several nerves. 



g 1193. Area prsechiasmatica (oz.), Ar. prch.— Fig. 116; PI. II, Fig. 3. 



The ventral aspect of the iasia encephali cephalad of the chiasma. 



§ 1193. Ar. septalis, Ar. spt.-Fig. 117; PI. II, Pig. 4; PL IV, Fig. 16. 



The mesal surface of either half of the Septum, lucidum ; see pseudoccelia, § 1397. 



Septal area — Flower, 13, 634. The name is ascribed to Huxley. 



§ 1194. Calcar (avis), A.— Gray, A, 62.5 ; Quain, A, 11, 542. 



This is the brief synonym of hippocampus minor, ergot and unciform eminence. It des- 

 ignates a projection into the postcornu of man and monkeys, and has not been observed in 

 the cat, where the postcornu is not normally developed. 



