402 DR. C. F. SONNTAG ON THE ANATOMY, 



hymen. The meatus urinariiis is within the vagina, so no 

 prominent vestibule is seen as in the human condition. The 

 glands of Bartholin lie between the vagina and rectum. Sperino 

 (47), Bischoff" (60), Chapman (12), Gratiolet (22), Hartmann (65), 

 Barkow (2), Hofimann (68), Symington (48), and Traill (49) 

 have described the external genitalia ; and many of these ob- 

 servers have described the internal organs. 



Winwoode Reade (57), Garner (21), and Mohrike (35) describe 

 a sexual season, and Bolau (5), Ehlers (59), Hermes (69), and 

 Keith (30) describe either the periodicity or characters of men- 

 struation. Pocock (80) contrasts menstruation in the Chim- 

 panzee and Hainan Gibbon. 



The Nervous System *. 



The olfactory nerve terminates by marked branches on the 

 upper thirds of the turbinate regions and nasal septum. 



The optic nerve is large and surrounded by a sheath of dura 

 mater. No arteria retinae centralis was detected in it, but the 

 injection ma,terial may not have traversed it. 



The oculo-motor nerve has superior and inferior divisions. The 

 superior division does not pierce, but runs to the inner side of, 

 the superior rectus. It supplies the superior and internal rectus 

 muscles and ends in the levator palpebrse superioi'is. The inferior 

 division runs downwards and outwards on the outer side of the 

 rectus inferior, gives a motor branch to the ciliary ganglion, 

 supplies the inferior rectus and ends in the inferior oblique. The 

 branch of the superior division to the internal rectus is ver}^ large. 



The trochlear nerve ends by three divisions to the superior 

 oblique muscle. 



The trigeminal nerve has three divisions as in Man, radiating 

 from the Gasserian ganglion. The ophthalmic division courses as 

 in Man, and breaks up into: — 1. Lachrymal nerve, lying between 

 the orbital wall and upper border of the external rectus. It 

 supplies the lachrymal gland, conjunctiva and skin of the eyelids. 

 2, Frontal nerve resembles that in Man. It breaks up into 

 supra-orbital and supra-trochlear branches. 3. Ifasal oiei've. 

 This is distributed as in Man, but the lateral terminal branch, 

 which is very large, comes out of the nasal cavity direct, and not 

 between bone and cartilage, as in Man. The ciliary ganglion is 

 larger than in Man. It lies on the lateral side of the oph- 

 thalmic artery and receives filaments from both divisions of the 

 third nerve, a twig from the naso-ciliary nerve, and sympathetic 

 filaments from the carotid plexus. It gives ofi' short ciliary 

 nerves : one large one, lying on the outer side of the optic nerve, 

 divides into upper and lower divisions on reaching the eyebnll. 

 The superior and inferior maxillary divisions of the trigeminal 

 are similar to those in Man, but I was unable to detect as many 

 branches radiating from Meckel's ganglion. The chorda tympani 



* The brain will be described in a separate paper by Professor G. Elliot Smith, 

 P.R.S. 



