1881.] 541 [Wilder. 



brain, these slight orifices, whicli are but rarely demonstrated, and have 

 never been, so far as I know, accurately figured, have a real and great 

 morphical value, and should be frequently named ; hence the desirability 

 of a short term capable of inflection. Since there is no other encephalic 

 porta, the single word is suflicient ; but Monroi may be regarded as belong- 

 ing thereto, in memory of the description of the parts by A. Monro 

 secundus (A). See my paper (3). 



Medicornu, etc. — In place of the terms Gornu descendens, etc., I have 

 suggested that the three prolongations of the procojlia into the LoM tem- 

 'poralis, frontalis, and occipitalis respectively, should be called medicornu, 

 prcecornu, and postcornu. The latter does not exist in the cat. 



Bima. — This brief name is proposed as a substitute for the phrase "rima 

 transversa cerebri magna, ' ' and its various classical or vernacular equiva- 

 lents. That, in the eat, the connection of the two borders of the rima is 

 complete, and capable of resisting a considerable pressure of air, alcohol 

 or plaster, has been repeatedly demonstrated by me since the 25th of No- 

 vember, 1876. But the proper nervous tissue is interrupted from the 

 dorsal border of the porta to near the tip of the medicornu, and, in so 

 heavy a brain as tliat of man, the membraneous connections are readily 

 torn during the extraction or manipulation of the organ ; see my paper, 9, 

 136. 



Proterma. — prtr. — The primitive lamina terminalis or I. cinerea. Terma 

 emhryonis. My reason for suggesting different terms for the adult and 

 embryonic terminal plates, is that, as now understood, the latter inchidesnot 

 only the lamina cinerea of anthropotomy, but also the parts afterward 

 differentiated to form the Columnce fornicis, and the prcecommissiira, with 

 perhaps some other parts of the fornix. 



Eypocampa. — In the paper on Nomenclature {9, 125) I stated that this 

 term is employed by Vicq D'Azyr (A) in the descriptions of the plates, 

 although the more common form Idppocampus occurs in the "List of ana- 

 tomical terms," in the same work. At that time, I had only seen the 

 passages in the description of pi. vii, fig. 1 and 3 ; pi. viii, fig. 2 ; on p, 

 61, and elsewhere, where the French form hypocampe is used. I have since 

 found several passages, as the descriptions of pi. vi, note, and plate viii, 

 fig. 2, where the Latin forms hypocampus and hypocampi are given. 



Vicq D'Azyr does not discuss the etymology of the term, but says (A, 

 p. 61), the "grande hypocampe" was first mentioned by Arantius and 

 Varolius, whose works are not now accessible to me. Even H3"rtl (A, 

 180), does not seem aware of the use of the word hj Vicq D'Azyr, and all 

 other writers, so far as I know, make it Mppocapmus. There is no such 

 word as y.djj.-m;^ and, if the original orthography cannot be ascertained, 

 hypocampa is to be preferred on etymological grounds ; the ridges known 

 as liippocampus major and Ji. minor bear no obvious resemblance to the 

 fish known to the ancients as l-Tzoy.dfi-oq and hippocampus, but the larger 

 of the two, which probably first received the name, does certainly present 

 a most notable doinnward curnature, such as the Greeks might have des- 

 ignated by ur.oy.aiizrj. 



