MORPHOLOGY OF THE BRAIN IN THE MAMMALIA. 323 



Mliicli they call " Stenops gracilis.'" There can, however, be little doubt that tiie 

 ambitious authors of this extraordinarily inaccurate book have followed in the footsteps 

 of Chudzinski, and have mistaken S/enojis [Nycticebus] for Lor Is. 



In the instructive memoir on the insula in the Carnivora which M. Holl * published 

 in 1809, thei-e is an interesting figure representing the lateral aspect of the right cei-ebral 

 hemisphere of a Lemur of unknown species. 



In 1!)00 E. Zuckerkandlt gave a brief account of the structure Avhich he c:ills by llie 

 misl(;ading title " Balkenwindung " in four species of the genus Lemur and in Chiroin/js ; 

 ;ind in the same year the most extraordinary contribution to the literatui'e relating to 

 the Prosimian brain was joublished +. 



In addition to Tiu-ner, to whose memoir reference has already been made, several other 

 Avriters have discussed the anatomy of the Lemur's brain, without apparently adding any 

 new data to the common stock. 



The writings of A. J. Parker § and Gegenbaur || belong to this categoi-y. 



Dr. Porsyth Major has described the form of the brain in two sub-fossil Lemuroids f; 

 and Rudolph Burckhardt has published some most extraordinary criticisms of Porsytli 

 ^Major's memoir, in the course of which he commits the blunders Avhich he erroneously 

 accuses tlie latter of perpetrating. 



Max AVeber, and in a lesser degree Eugene Dubois and Theodor Ziehen, have 

 investigated the weight of the brain in the various Prosimian genera. Their results 

 are discussed in the body of this Memoir. 



The nucleus of the material upon which this account is based consists of four brains of 

 Lemur fill c lis [labelled mougoz, ulbifrons, and two of tliem nlgrifro>is\ and one each of 

 Lemur varius. Lemur catta, Nycticebus tardiyradus, Loris gracilis, Perodicticus ijotta, 

 Galago Garneiti, Galago crassicaudata, and Microcebus Smithi, in the Collection of the 

 Royal College of Surgeons in London. These are the same brains upon which Ziehen's 

 memoir was based ; but as I found it necessary to remove the pia and arachnoid 

 membranes before I could pro2)erly see the surface of any of these specimens, the reader 

 will appreciate one of the reasons for any discrepancies which may bo found in the two 

 accounts of tlie same specimens. 



Since Ziehen's visit to the College of Surgeons two brains of CJiiromys have been 

 placed in the Galleries. One of these was found in the College Stores and the other was 

 purchased from the Zoological Society, Mr. Eeddard kindly consenting to part with his 



* " Ueber die Insel des CaruivorengcLirns," Arcb. f. Aimt. u. Phys., Anat. Abtli., Taf. 12. ti^;. Hi. 



t " Beitriige /.ur Anatomic des lleicbcentrums," 8it/.UDgsbcritbtL'u d. kaiserl. Akud. der Wisseiisch. in Wini. Malb.- 

 naliirw. CI., Bd. cix. Abth. iii., .July 1000, \). 2. 



J Ilonry C. Chapman, " Observations upon the .Vnatoray of Hijhlates Icuciscus and Chlromys imulnijusairiemt.i." 

 Proc. Acad. Xat. Sci. Philadelphia, May lOOO, p. 420. 



§ " Morpholojiy "f the Cerebral Convolutions, with Special Reference to the Order of Primates," Journ. .\cad. Nat, 

 Sci. Philadelphia, 2iid series, vol. x. (ISUG). 



II ' Vergleich. Anat. der Wirbelthiere,' i. Bd., Leipzig, 1898, pp. TGG & 7<)7. 



i[ "On the Br;iius of two Sub-Fossil Malagasy Lemuroids," Proc. Itov. f^oc. vol. 62 (1897), pp. 46-50. 



