SCIENCE. 



135 



CRUS OLFACTORIUM. — Cr. ol. — The isthmus by which 

 the bulbus olf. is connected with the prosen, 

 Crusta (cruris cerebri), est. 



Decussatio piniformis. — dc. pnf. — " Finiform 

 decussation," Spitzka. 



Decussatio ventripyramidum. — dc. vpy. — The 

 " decussation of the anterior pyramids." 



Delta (fornicis). — d. — A subtriangular area of the 

 ventro-caudal surface of the fornix of the cat. The lat- 

 eral angles are at the porta, and the apex points dorso- 

 caudad. It is bounded by the lines of reflection of the 

 endyma, and represents the entoccelian surface of the 

 fornix. Wilder, 5. It probably exists in man. 



Dentatum, (corpus cerebelh). — dnt. 



Distela. — dtl. — The tela vasculosa forming the mem- 

 braneous roof of the dicoelia or " third ventricle." 



Diencephalon. — den. — The thalamencephalon, 

 deutencephalon, inter-brain, enclosing the dicoslia. 

 Whether it should include also the aula and its walls is 

 to be determined by reference to the condition of the 

 parts in some of the lower vertebrates. 



Dorsipyramis. — dpy. — The posterior pyratnid of the 

 m etencephalon . 



Diccelia. — dc. — The "third ventricle," or " ventri- 

 culus tertius," less the aula. The interthalamic space, 

 reduced in mammals by the medicommissura. 



DlPLEXUS. — dpi. — The plexus of the "third ventricle." 



Encephalon. — en. — The brain, including the medulla 

 or metencephalon. 



Endyma. — end. — Ependyma. Lining membrane of 

 the ventricles. 



Epencephalon. — epen. — The hind-brain, or cerebel- 

 lum with the pons and its peduncles, and the correspond- 

 ing part of the medulla. It is difficult, perhaps impos- 

 sible, to define exactly the limits of the epen. and the 

 metencephalon, and of their respective cavities. 



EpiCCELIA. — epc. — The division of the ventricular 

 cavity corresponding with the cerebellum. Perfectly dis- 

 inct in the cat, and even in man, but relatively more ex- 

 tensive in many of the lower vertebrates. 



Fasciola.— -fscl. — May not this single word take the 

 place of fasciota cinerea and fascia dentata ? The parts 

 are continuous, and the latter is not dentate in the cat. 



FlLUM TERMINALE (myelonis).— fl. t. 



Fimbria.— -fmb. — Corpus fimbriatum. Tcenia hippo- 

 campi. "Fimbria," Meyn. A, 667. 



FLOCCULUS. — flc. — Lobulus pneicmogastricus. The 

 flocks. This seems to be a different part from the lobulus 

 appendicular j s of the carnivora, with which it has been 

 sometimes confounded. 



Foramen C/ECUM. — Fm. c. — " Fossa cceca," Spitzka, 

 3, 6. Foramen ccecum is used by Dunglison and Vicq 

 D'Azyr (A, pi. xviii., "48 "), and should be retained, not- 

 withstanding the somewhat unusual application of the 

 word foramen. 



Foramen infundibuli. — Fm. inf. — The orifice in 

 the tuber cinereum left after the removal of the hypoph- 

 ysis and infundibulum. 



Foramen magendie. — Fm. mg. — The communica- 

 tion of the metacaelia with the " subarachnoid space." 

 Not having satisfied myself as to the nature of this com- 

 munication, I prefer to quote from Quain, A, ii., 513. 



FORNIX. — f. — Camara. Testudo cerebri, &c. 



Genu. — g, — Genu callosi. 



Habena. — h. — Habenula. Pedunculus pinealis. 

 There seems to be no need of using the longer word. 

 According to my observations, the habena have a dis- 

 tinct morphical significance as nearly corresponding with 

 the lines along which the endyma is reflected toward the 

 opposite side ; 5 and 7. 



Hypophysis. — ky. — Pituitary body. 



Hypocampa. — hym. — Hyppocampus major. The rea- 

 sons for preferring the form employed by Vicq D'Azyr are 

 presented elsewhere in this article. 



Iter. — i. — Iter a tertio ad ventriculum quartum. 

 Aquceductus Sylvii. A convenient name for the contracted 

 mesoccelia of man and most mammals. 



Insula. — ins. — Island of Reil. Lobus centralis. In- 

 sula cerebri. Gyri operti. 



Infundibulum. -inf. — Infundibulum cerebri, &c. 



Interopticus. — {lobus). — top. — The interoptic lobe ; 

 Spitzka, 4, 98 ; 5. In some reptiles. 



Lemniscus inferior. — Imn. £. — Spitzka, 4, 95 and 

 100. 



Lemniscus superior. — Imn. s. — I have not been able 

 to identify these parts in the cat. 



LlGULA. — Ig. — " Ponticulus." Ligula, Quain, A, II, 

 506. 



LIMES ALBA. — Im. a. — Limes alba radicis lateralis 

 rhinencephali. The white stripe of the lateral root of 

 the rhinencephalon. Perfectly distinct in the fresh brain 

 of the cat. 



Limes cinerea. — Im. c. — The gray stripe of the 

 radix lateralis. 



LIQUOR VENTRICULI. — lq. vn. — This term is used by 

 Mihalk. A, 163. Is a better one to be found ? 



Lobulus appendicularis (cerebelli). LI. ap. 

 The appendicular lobule of the cerebellum of many carni- 

 vora, and perhaps other mammals. It seems to have been 

 confounded in some cases with the human flocculus, but 

 more probably represents the lateral lobes of the cerebel- 

 lum. Its relations should be studied in a series of related 

 forms. See my paper, n, 217. 



Lobulus olfactorius. — L. ol. — The olfactory 

 lobe of the hemisphere. A part of the hemisphere said 

 to be in more direct connection with the rhinencephalon. 



LOBUS OLFACTORIUS. — L. ol. — A general name for 

 either half of the rhinencephalon, including the crus and 

 the bulbus. 



Locus Niger. — Ic. n. — The locus niger of the crus 

 cerebri, between the tegmentum and the crusta. 



Medicommissura. — mcs. — Commissura mollis. Mid- 

 dle commissure. "Thalamic fusion," Spitzka. 



Medicornu (proccelia;). — mcu. — Cornu temporale. 

 The middle or descending horn of the " lateral ventricle." 



Medipedunculus (cerebelli). — mpd. — Crus ad pon- 

 tem. Middle peduncle of the cerebellum. 



Mesencephalon. — men. — The mid-brain. The lobi 

 optici, postoptici and interoptici, with the corresponding 

 crura cerebri. 



Mesoccelia. — msc. The ventricular division cor- 

 responding with the mesencephalon. In man and most 

 mammals it is usually reduced and known as iter, or 

 aquaductus Sylvii. 



Metatela. — mtl. — The membraneous roof of the me- 

 taccelia, or " fourth ventricle." 



Metaccelia. — mtc. — The "fourth ventricle," ventric- 

 ulus quartus. Ventricle of the metencephalon. 



Metaplexus. — mtpl. — The plexus choroideus of the 

 metaccelia. 



Monticulus (cerebri). — mnt. — The ventral promi- 

 nence of the lobus temporalis. Natiform protuberance. 

 Aiveus. Subiculum. 



Myelencephalon. — myen. — The cerebro-spinal axis. 

 The term was proposed by Owen. 



Myelon. — my. — The spinal cord. Owen. Huxley. 



Nervus olfactorius— -N. ol. — Olfactory nerve. 



Nucleus lenticularis. — nc.ln. — Nucleus lenti- 

 formis. Meynert. 



Obex. — I have not identified this part. 



Oliva. — 0.— corpus olivarium. Olivary body. Olive. 

 The "inferior olive." Spitzka. 



Opticus, (lobus). Natis cerebri. An optic lobe, ex- 

 cluding the postopticus and interopticus. 



Pero (olfactorius). — po. — The softer cap, or shoe-like 

 covering of the rhinencephalic lobe, from which the nervi 

 olfactorii directly spring. In the cat this may be accurate- 



