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III. On the Brain of the Javan Loris (Stenops javanicus, Illig.). By William Henry 

 Flower, F.R.C.S., F.L.S., F.Z.S., Conservator of the Museum of the Royal College 

 of Surgeons. 



Read Marcli 11, 1862. 



[Plate XXVII.] 



Although the brain of Ste7iops has been described by such eminent anatomists as 

 Van der Hoeven', Schroeder van der Kolk-, and VroIik^ both tlie description and 

 figures given by these authors appear to me insufficient tor the requirements of modern 

 zoological science, partly because, at the period at which they were made, attention 

 enough was not paid to those precautions now known to be necessary for preserving 

 the essential characters of the organ during its examination, and partly because the 

 knowledge of the arrangement of the cerebral convolutions of the higher Quadrumana 

 had not then attained to that state of precision to which the researches of Gratiolet^, 

 and others who have followed in his path, have since brought it. It is proposed, 

 therefore, in the present communication, to put on record a new description of the 

 brain of an animal of this genus, dwelling especially upon the form and surface-markings 

 of the cerebral hemispheres, and to add a few observations suggested by a comparison 

 of this brain with that of some of the most nearly allied forms. 



The individual which furnished the subject of this memoir was an adult female, 

 which died in the Society's Gardens in January 1862. In the examination of the 

 brain every cai'e was taken to preserve the natural configuration of the different por- 

 tions of the organ ; the drawing of the upper surface was made before its removal from 

 the cranial cavity, and the other drawings, descriptions, and measurements have been 

 checked by a comparison with a cast of the interior of the skull. 



Description of the Brain- 

 When seen in situ (fig. 1), the two hemispheres present together an oval figure, 

 13 inch in length, and 1'05 inch across the broadest part, which is at the junction of the 

 middle and posterior third of the long axis. From this point the oval gradually narrows 

 to rather a sharp apex in front, formed by the closely approximated anterior termina- 

 tions of the two hemispheres. The more rounded posterior end of the oval is inter- 



' Tijdschr. voor natuurl. GescHed. d. 8, 1841, p. 337. 

 ^ Bijdrage tot de Anatomie van den Stejiops kukang. Leiden, 1841. 

 ' Nieuwe Verhand. der 1'^ Klasse v. h. kon. Nederlandsche Inst., 1843. 

 ■* Memoire sur les Plis cerebraux de I' Homme et des Piimatis. Paris, 1854, 

 VOL. V. — PART III. P 



