458 DK. R. BROOM OX THE 



the relations of the squainosiil to the pai-ietal and maxilla, and 

 of the hyoid to the Vllth nerve and to the tympanic. 



Fig. 11 is through the incus and the stapes. The stapes is 

 seen pierced by the large stapedial ai'tery. The incus is large 

 and is seen mainly covei-ed by the squamosal. The Vllth nerve 

 is seen cut in three places, the inner part being continuous with 

 the geniculate ganglion. In the lower part of the section is seen 

 the large ganglion of the vagus nerve. 



Fig. 12 shows the tabular bone and its relations to the supra- 

 occipital, exoccipital, and auditory capsule. Whatever be its 

 significance, it has manifestly, as will be seen, nothing to do 

 with the auditory capsule, 



Concludiny observations. 



The skull of Chrysochloris is in part a primitive, and in part a 

 specialised aiid degenerate type. 



It is primitive in the structure of Jaeobson's cartilage, in 

 the feeble development of the inferior turbinal, in the simple 

 columella-like alisphenoid, in having a large maxillary zygomatic 

 process, in the possession of a large complicated pterygoid which 

 articulates with a large basisphenoidal process, and in the 

 possession of a distinct tabular bone. 



It is degenerate and specialised in the I'udimentary condition 

 of the orbitosphenoid, in the loss of the ectopteiygoid inter- 

 parietal, and jugal, and the lack of development of a zygomatic 

 process of the squamosal. 



The examination of the skull confirms the result of the 

 examination of Jaeobson's organ and its relations in showing 

 that Chrysochloris is not a near ally of Centetes, and that it 

 is not an Insectivore. Further, it is not allied to the Meno- 

 typhla, and ought to be placed in a distinct order Chrysochloridea. 



JExpIanation of Lettering of Text-Jignres and Flates. 



Art.D. articular head of deiitary ; A.S. alisphenoid; And. auditory capsnle ; 

 B.O. basioccipital ; U.S. basisphenoid ; JJ.-4. external auditory meatus; IS.O. 

 exoccipital; IP.J. forainen jugulare; F.B. fenestra rotunda; Fr. frontal; G.G. 

 (iasserian ganglion; G.X. ganglion of XtVi nerve; Hy. hyoid; Inc. incus; J.C. 

 Jaeobson's cartilage; hd. ; I.y. lacrimal gland ; Mai. malleus; Md. mandible; Mk. 

 Meckel's cartilage; Mx. maxilla; Na. nasal; O. orbit; O.S. orbitosphenoid; 

 P. A. prearticular ; P«. parietal: FaJ. palatine; PciJ. petrosal ; Fmx. preraaxilla : 

 P.N.F.C. posterior nasal-tloor cartilage; Ft. pterygoid; S.A. surangular ; S.E. 

 saccus endolymphaticus ; S.O. supraoccipital ; S.P.G. spheno-palatine ganglion; 

 Sq. squamosal; St. stapes; St.A. stapedial artery; Tb. tabular; Ty. tympanic; 



/'. Vth nerve; Vmd. mandibular branch of Vth nerve; Vmx. maxillary branch 

 of Vth nerve; VII. Vllth nerve; T'o. vomer; V.S.F. venous sinus of frontal; 



X. problematic bone at back part -of nasal capsule. 



EXPLANATION OF PLATES I. & II. 



Figs. 1-1:2. Transverse sections of skull of newly-born Chri/sorliloris hottentota. 



All sections arc 15 times natural size. 



