1882.] PROF. ST.-GEORGE MIVART ON THE ^LXJROIDEA. 515 



bronchi long and narrow in Hycena ; while in Suricata the bronchi 

 are very large, and almost without rings. 



In Felis, Fiverra, Genetta, Hemigalea, Herpestes, Suricata, Pro- 

 teles, and Hyana the lungs are divided into four lobes on the right 

 side, and into three on the left side. 



In Crocuta ' the right lung has six lobes and the left lung three. 

 INIeckel (/. c. p. 492) says that the two lower left lobes in the Genet 

 form but one, and that in the Tiger, Leopard, and Puma there are 

 also but two on the left. 



Great Blood-vessels. 



In Felis, Viverra, Genetta, Hemigalea, Proteles, and Crocuta the 

 aortic arch gives off one great trunk, whence arise first the right sub- 

 clavian and then the carotids. The left subclavian is given off 

 separately ^. 



In Felis, Genetta, Prionodon, Hemigalea, Herpestes, and Cro- 

 cuta^ the abdominal aorta does not give off common iliac arteries, 

 but first gives off two large arteries which spring opposite each 

 other from the aorta and are the external iliac arteries, and then 

 continues on for a short space before giving off another pair of 

 vessels (also arising opposite each other), which are the internal 

 iliac arteries. 



The Brain. 



In the brain of the Cat, and in the brains of such Felidce as I have 

 had the opportunity of seeing, there is a well-marked crucial sulcus, 

 the hinder inner end of which is separated (on the inner surface of 

 each cerebral hemisphere) from the anterior end of the calloso-mar- 

 ginal sulcus by the continuation forwards of the hippocampal gyrus 

 into the superior external gyrus. This condition does not seem to 

 obtain in any non-feline .^luroid. 



In Genetta the superior lateral gyrus (s) runs simply forwards 

 beside its fellow of the opposite side without being divided by any trans- 

 versely extending crucial sulcus, the place of which is only indicated 

 by a minute notch on its inner border (c b) . Nevertheless the supe- 

 rior lateral gyrus bears a small depression (d) placed a little behind 

 and external to the notch just mentioned ; and this depression may 

 represent the outer end of the crucial sulcus of Felis. 



At its anterior end the superior lateral gyrus dips down, and then 

 becoroes in part continuous with the middle lateral gyrus (m) above 

 the upper end of the supraorbital sulcus (« s). 



The Sylvian fissure {Sf), which is rather long and strongly con- 

 cave forwards, is bounded on each side by the inferior lateral gyrus, 

 which gyrus is much broader behind than in front of the Sylvian 

 fissure. The inner side of the anterior end of the superior lateral 

 gyrus (beyond the notch c w) runs backwards, beneath the calloso- 

 marginal sulcus, and becomes continuous with the hippocampal gyrus. 



From the minute indication of the crucial sulcus (c n) a sulcus runs 



' P. Z. S. 1879, p. 88, fig. 4. 



2 Meckel (Anat. Comp. vol. is. p. 396) appears to have found all four vessels 

 spring from a common trunk in the Genet. 

 ' P. Z. S. 1878, p. 89. 



