134 



SCIENCE. 



or less distinct parts, but a few indicate general regions, 

 or areas which are distinguishable by color or elevation. 

 No purely histological features are referred to. Some 

 parts of the cerebellum and medulla are omitted alto- 

 gether. The names of the fissures of the cat's cere- 

 brum have been discussed in a previous paper, 8. 



In each case, the name first given is regarded as pref- 

 erable ; but occasionally I have indicated the desirability 

 of a better one. So much of each name as is printed in 

 small capitals is regarded as a sufficient designation of 

 the part under ordinary circumstances ; sometimes it may- 

 be desirable to add the words in parenthesis. Most of 

 the names are those in common use, with the omission 

 of superfluous elements like corpus, and the genitives of 

 the names of more comprehensive parts. Most of the 

 apparently new names will be found to be old acquaint- 

 ances under such thin disguises as translation, trans- 

 position, abridgement, and the substitution of prefixes 

 for qualifying words. In a few cases the old names are 

 wholly discarded for briefer new ones. Most of the new 

 names, however, refer to parts apparently unobserved 

 hitherto (e. g., crista, carina, delta,) or to parts which — 

 although probably observed — seem not to have been re- 

 garded as needing a special designation, (e. g„ aula, 

 quadrans, corpus prcrpontile.') 



Let me express here my desire to be favored with the 

 fullest and freest criticism, both as to the general ques- 

 tions involved in this revision, and as to the special 

 terms here proposed. 



Albicans, (Corpus). — abn. — C. candicans, c.mammil- 

 lare, etc. Unable to ascertain which of its many titles 

 has priority, I select that which indicates its most ob- 

 vious feature on the fresh brain. 



Amygdala, (cerebelli). — ag. cbl. 



ARACHNOIDEA, (Membrana). — Ach. — The arachnoid 

 layer. 



Area cruralis. — Ar. cr. — The general region of the 

 base of the brain between the pons and the chiasma. 

 The middle region, or region of the isthmus. 



Area elliptica. — A. el. — An area, in the cat, just 

 laterad of the ventripyramis. Perhaps it represents the 

 "inferior olive." 



Area intercruralis. — Ar. icr. — The interpedun- 

 cular space. The mesal part of the Area cruralis. 



Area postpontilis. — Ar. ppn.— The ventral aspect 

 of the metencephalon, (medulla). The caudal one of 

 the three general regions into which the base of the 

 brain may be conveniently divided for description. It is 

 more extensive, relatively, in the cat than in man. 



It will be noted that the adjective pontilis follows the 

 analogy of gentilis rather than montanus or fontz?ialis. 

 The form pontal, however, has been used by Owen. 

 (A, III). 



Area pr<ECHIASMATICA. — Ar.prch. — The cephalic 

 one of the three areas of the base of the brain. The 

 space cephalad of the chiasma. 



Arbor viT/E (cerebelli). — Arb. 



Aula. — a. — The cephalic portion of the third ven- 

 tricle ; the prethalamic part of the " third ventricle," be- 

 tween the two portas, or foramina Monroi ; 'aula,' 

 Wilder, 3 and 5." " The here common ventricular cav- 

 ity," in Menobranchuv, Spitzka, 6, 31. This represents 

 the cavity of the "unpaired hemisphere vesicle," formed 

 by a protrusion from, or constriction of, the " anterior 

 primary encephalic vesicle," the aula is relatively larger 

 in some of the lower vertebrates. 



Auliplexus.— apx.— The plexus of the aula. The 

 free border of the fold of pia, known as the velum, 

 forms a vascular plexus in the aula, in each porta, and 

 in the medicornu of the procceha. In place of com- 

 pound terms, like plexus aula:, etc., I suggest that single 

 terms be formed, auliplexus, port/plexus, and proplexus. 

 For the plexuses of the dicalia and metaccelia — the 

 "third" and "fourth ventricles" — we may use di- 

 plexus and mctaplexus. 



BASICOMMISSURA. — bcs. " The basilar commissure 

 of the thalami," Spitzka, 2, 14. The ventral continuity of 

 the two thalami. 



BlVENTER (cerebelli). — bv. — The biventral lobe of 

 the cerebellum. 



BULBUS OLFACTORIUS. — B. ol. The olfactory bulb. 

 The more or less expanded cephalic part of each lateral 

 half of the rhinencephalon, consisting of the pes and 

 pero. Often called olfactory lobe. 



Calamus (scriptorius). — elm. 



Calcar (avis). — clc. Hypocampa, or hippocampus 

 minor. 



Callosum, (corpus). — cl. — Commissura cerebri max- 

 ima, trabs medullaris, etc. 



Canalis centralis (myelonis). — Cn.ce. — The cen- 

 tral canal of the spinal cord. 



Carina (fornicis). — ca. — The mesal ridge of the 

 caudo-ventral surface of the fornix, dorso-caudad of the 

 crista. I am not sure of its existence in man. 



Cauda striate — cd.s. — "Surcingle," Dalton (1, 13) ; 

 the slender continuation of the striatum caudo-ventrad. 

 If a new name is required for this longer " tail," which 

 was described by Cuvier (B. 1 1 1, 51), as forming, with the 

 striatum proper, a "horse-shoe," Prof. Dalton's " surcin- 

 gle " may be technically rendered "cingulum." I have 

 not yet looked for the cauda in the cat. 



Cerebellum. — cbl. — Several of the external features 

 of the cerebellwn are omitted from this paper. 



Cerebrum. — cb. — T\\eprosencephalon,\tss the striata. 

 The heniisphara. 



Chiasma (opticum, or nervorum opticorum). — ch. — 

 The optic chiasma or commissure. 



Cimbia. — cmb. — " Tractus transversus pedunculi," 

 Gudden, as quoted by Meynert (A, 737). A slender white 

 band across the ventral surface of the crus cerebri. It is a 

 distinct ridge in the cat. The word is used in architec- 

 ture to denote a band or fillet about a pillar, and is here 

 proposed as a fitting substitute for Gudden's descriptive 

 name. 



Cinerea, (substantia). — c— The gray matter of the 

 nervous organs. 



Claustrum.— ch— The " claustrum," (Burdach) ; 

 " nucleus tania for mis," '(Arnold), as stated by Quain, A. 

 II, 564. 



Columna (fornicis).— Co. /.—The anterior pillar of 

 the fornix, assuming that there is one upon each side. 

 It would be convenient to have a single short name. 



Ccelia.— C— A ventricle of the encephalon. For a brief 

 statement of the reasons for substituting this for the word 

 ventriculus, see elsewhere in this article. 



Commissura fornicis— Cs. /.—in the cat, a distinct 

 band across the caudal aspect of the fornix just ventrad 

 of the crista, and apparently uniting the two columna; 

 more closely. 



Commissura habenarum.— cs. h.—A white band 

 connecting the caudal ends of the habenas, and forming 

 the dorsal border of the Fm. conarii. 



Conarium.— cn. — The glandula pinealis. Epiphysis 

 cerebri. Penis cerebri. 



Corona radiata. — Cn. r. — C. radians. 



Corpus pr^epontile.— Cp. prp.—A slight white 

 longitudinal ridge of the postpciforatus, near the meson. 

 It is distinct in the cat. When more fully known, per- 

 haps a better name may be found. 



Cortex (cerebri, or cerebelli).— ctx.— The ectal layer 

 of gray and white substance at the surface of the cere- 

 brum and cerebellum. 



Crena (calami).— cm.— The caudal end or notch of 

 the metaccelia. 



Crista (fornicis).— crs.— A small but, in the cat, very 

 distinct ovoid mesal elevation of the caudal surface of the 

 fornix, ventrad of the carina, and dorsad of the commis- 

 sura fornicis, and the recessus aula. It is also present in 

 the human brain. Wilder, 7. 



Crus cerebri— Cr. cb.— Pedunculus cerebri. 



