SYJVOJSTYMS AND REFERENCES. 489 



alba called corona rndiata, and between tbe Nucleus lenticularis and the insula, wliicli lies 

 ectad of it, is a thin lamina of cinerea, the daustrum. 



The presence and arrangement of these divisions in the cat have not yet been deter- 

 mined by us, and we have therefore preferred to use the comprehensive term striatum. 

 The student will avoid some confusion if he bears in mind that all of them are portions of 

 the thickened procoelian parietes. 



Spitzka has commented (7, 166) upon the misleading use of the term Nucleus in this 

 connection ; we suggest that the caudate and lenticular portions of the striatum be known 

 as (Corpus) caudatum and (Corpus) lenticular e. 



§ 1319. Sulcus habenae, 81. A.— Fig. 123 ; PI. Ill, Fig. 7; §§ 1143, 1156, 1165. 



This name was proposed by the senior author (,♦>, 136 ; H, 538, 544) for the more or 

 less distinct furrow along the dorso-mesal angle of the thalamus just dorsad of the habena. 

 It coincides nearly with the line of reflection of the diacoelian endyma toward the oppo- 

 site side. 



§ 1320. Sulcus intercruralis lateralis, SI. ic. I.— Fig. 118 ; PI. Ill, Fig. 11. 



The A7'ea intercruralis of the cat presents some features which may not exist in man 

 or may have escaped notice. They are most distinctly visible when the cerebellum is 

 removed and the " medulla " is dorsiducted as in Fig. 118 and PI. Ill, Fig. 11. 



Caudad of the small (Locus) postperforatus there is a mesal fissure, the Sulcus intercru- 

 ralis mesalis, and on each side a Sulcus intercruralis lateralis. Between them, of course, 

 are two ridges. 



§ 1321. Sulcus intercruralis mesalis, SI. ic. ms. — See g 1320. 



§ 1322. Sulcus limitans, SI. /t.— Fig. 121 ; PI. Ill, Fig. 13; §§ 1149, 1155. 



This name was proposed provisionally by the senior author {0, 137 ; 1^, 538) for the 

 " depression between the thalamus and the striatum " (Gray, A, 6'2o ; Quain, A, II, 549), 

 which is obvious and usually mentioned, but has apparently not been named. So long as 

 both the bodies above mentioned are regarded as parts of the procoelian floor, this furrow 

 might not require special designation any more than the furrow between the fornix and 

 the hypocampa. But, in the cat at least, " this furrow is the line of separation between 

 the entocoelian surface of the striatum and the ectocoelian surface of the thalamus. A 

 shorter term is, however, desirable." 



§ 1323. Sulcus triradiatus (az.), SI. trd.—Fig. 118 ; PI III, Fig. 11 ; § 1169. 



This name was proposed by the senior author (IJ:, 554) for the three-pointed shallow 

 depression which demarcates the albicantia from each other and from the Tuber cinereum. 

 It is much deeper in the human brain. 



§ 1324 Terma (az.), t.—Fig. 110-112, 117 ; PI. II, Fig. 4 ; PI. IV, Fig. 16. Gray, 

 A, 620 ; Quain, A, II, 536. 



Si/n. — Lamina terminalis s. cinerea. 



The thin lamina between the prsecommissura and the chiasma and crista, and forming 

 the cephalic boundary of the caudal portion of the aula. 



The name was proposed by the senior author (.9, 137 ; 14, 541) as a brief and signifi- 

 cant substitute for the compound terms commonly employed. It is the termination of the 

 mesal series of coelise, and therefore has considerable morphological significance ; but it is 

 so delicate as to be sometimes overlooked, and is usually ruptured in the extraction of the 

 human brain. 



§ 1325. Thalamus, th.—Fig. 110-113, 117, 122, 123; PI. II, Fig. 4 ; PI. Ill, Fig. 6, 7, 

 9, 10, 13; PI. IV, Fig. 16, 18, 19 ; §§ 1143, 1144, 1156, 1157. Gray, A, 629; Quain, A, 

 II, 535. 



