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III. On the Brain of the Javan Loris (Stenops javanicus, Illig.). By Witt1am Henry 
Fiower, F.R.C.S., F.L.S., F.Z.S., Conservator of the Museum of the Royal College 
of Surgeons. 
Read Marck 11, 1862. 
[Prats XXVII.] 
ALTHOUGH the brain of Stenops has been described by such eminent anatomists as 
Van der Hoeven', Schroeder van der Kolk?, and Vrolik®, both the description and 
figures given by these authors appear to me insufficient for 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 care 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, 
1°3 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. Geschied. d. 8, 1841, p. 337. 
* Bijdrage tot de Anatomie van den Stenops kukang. Leiden, 1841. 
3 Nieuwe Verhand. der 1* Klasse v. h. kon. Nederlandsche Inst., 1843, 
* Mémoire sur les Plis cérébraux de Homme et des Primatés. Paris, 1854. 
VOL. V.—PART III. P 
