SLulls of the Fcliila; and Vivcrridic. 2G9 



fpiiPstr.T and on tlu- inner sicio abnttinp n^raiiist tlie ba^^ioccijiitftl ; 

 fp., foniincn liu-Hruni pusticnm with the coiulylnid fornnu!! just 

 beliind it; ;»wr., piimcfiiiitiil ; th., tviiipaiiic bulla, the position 

 of tlie partition sli()wn l)y a dotti,'(l Ihr', 



Fig. 2. Base of cranium of C'ryptoprorta ferox with the two bullae in 

 Tilace. Lettering and arrows as in fig. ] ; ftn., the foramen 

 laceruni niedi'im piercing the splienoid as a round hole entirely 

 separated from the periotic. 



Fiy. 3. Base of cranium of Muu//<>s iclincuinon with the antero-intemal 

 portion of the bulla of the left side cut away to show the bony 

 carotid canal {cc.) running alongside the basiocoipital and 

 terminating in front a little behind the part of the foramen 

 lacerum medium (/?«.) which is separated from the periotic 

 (l>er.), the rest of it being represented by the smaller, more 

 external orifice behind; co., the posterior orifice of the carotid 

 canal. Other lettering and arrows as in figs. 1 and 2. 



Fiij. 4. Base of cranium of NcnKlinia binotatu with the cartilaginous 

 portion of the bullre missing from both sides and the osseous 

 anterior portion, niarl;ed th. on tiie left side, removed from the 

 right. The stylomastoid foramen {st.) is remote from the 

 margin of the prominent mastoid (;«.) and the fenestra rotunda 

 on the periotic {per.) is on its inner side ; the foramen lacerum 

 nitdium (fm.) is a small orifice in the basisphenoid lying deeply 

 beneath the tympanic {th.) and touching the periotic by a very 

 narrow cleft. Other lettering as in preceding figures. 



Plate XI. 



Fiy. 1. I^eft auditory bulla of Civeltictis civetta, and seen obliquely from 

 the underside to show the course of the carotid cavlhI {car.), 

 represented by a dotted groove. The canal comes to an end at 

 the edge of the inturned portion of the tympanic bulla ; ea., ex- 

 ternal auditory meatus formed by tympanic ring. 



Fig. 2. Left auditory bulla of Arctictia bintnrong from the same aspect. 

 The carotid groove is almost converted into a bony tube in- 

 feriorly; eu., eustachian tube. The large groove behind the 

 carotid groove leads to the foramen lacerum posticum. 



Fig. 3. Anterior portion of the left bulla of Paynma larvata, to show tlie 

 carotid groove passing anteriorly into a bony tube, the arrow 

 indicating a bristle ti-aversing the canal. 



Fiy. 4. The same in Gcnettn felina. 



Fiy. b. Bight bulla of Fvlis imcia from the same aspect as represented in 

 the foregoing figures. The arrow indicates a bristle passed 

 through the carotid canal (car.), part of which is a complete 

 bony tube. In all Felidic the canal apparently takes the same 

 course, which is practically the same as that of Civettictis and 

 Arctictis, but the canal is almost always an open groove, and 

 not a bony tube. 



Fig. 6. Bight bulla of Viverricida malaccetifiis, with arrow indicating the 

 course of the carotid artery anteriorly beneatii the triangular 

 flange of bone, which is not united beneath the artery to the 

 adjacent bone of the tympunic ring to form a tube such as is 

 seen in Geiwtta. 



Fiy. 7. Left half of base of skull of Diployale hosei, showing the very 

 short carotid canal beginning at car. ; /j/j. and fp., foramen 

 lacerum medium and posticum ; st., Btyiomattoid foramm ; 

 tb., tympanic bulla, with the line showing the separation 

 between the two portions. 



