418 ON THE ANATOMY OF SUS SALVANIUS. [JuiielO, 



vvliich runs up almost to the middle line, and called the processus 

 superior; it then bends downwards and forwards, this portion being 

 called the processus anterior (ssa), and is continued forward as the 

 diagonal fissure (d). On the left side the suprasvlvian fissure is 

 more simple (figs. 2 and .S) : it has two posterior branches and an 

 ascending anterior branch as on the right side ; it then passes down- 

 wards and forwards and terminates. The diagonal fissure (d) is quite 

 separate on this side from the suprasylvian fissure. .Between the 

 sujirasylvian fissure (ss) and the longitudinal fissure is a straight 

 fissure, Jis. lateralis (/) (fig. 3). A little anterior to the processus 

 suj)erior of the suprasylvian fissure springs the Jis. coronalis (co) 

 (fig. 3), an important fissure, which runs from the longitudinal fissure 

 and extends forwards and outwards till it nearly meets the rhinal 

 fissure. Besides these principal fissures there are a few of small size 

 jirosent, especially on the right side. A very small speck of the 

 island of Reii is to be seen at the junction of the rhinal and sylvian 

 fissures on each side. The olfactory bulb is of considerable size. 

 In general form and in the arrangements of the fissures the brain 

 is exceedingly like that of Sus, especially on the left side. 



The uterus was seen, on opening the abdominal cavity, to occupy 

 the anterior portion ; and on examination was found to be pregnant, 

 containing five young. It resembles that of the Pig. 



The Jfidneys measure 5'5 cm. in length, and are surmounted by 

 suprarenal capsules of considerable size. 



Conclusions. — The differences found to exist between the animal 

 just described and Sus scrofa are very unimportant and few, the 

 chief being the absence in the present specimen of the transverse 

 fold between the gastric cavit)' and the antrum pyloricum, and of 

 the long Peyer's patch in the intestine, and the presence in the liver 

 of a superficial vena cava, of a small cystic fissure, and its right 

 lateral lobe being considerably larger than the left. Those differ- 

 ences are not sufficient to require the formation of a distinct genus 

 for the animal as has been done by Hodgson, who claims for it 

 the following generic characters as separating it from Sus: — a differ- 

 ence of dentition, since in the specimens examined by him the 

 posterior molar was absent, indicating probably that it was the skull 

 of a young animal, and that the tooth had not been acquired (this 

 suj)posed difference of the molar dentition from that of Sus, I have 

 shown does not hold good) ; the canines not being protruded beyond 

 the ]i[)S (a condition which we find to obtain in the male specimen 

 now living in the Gardens) ; the inner digit being shorter than the 

 outermost (a condition which we find obtains in Sus scrofa). Having 

 shown that none of these supposed generic characters exist, and that 

 the animal resembles Sus so closely that there is no ground for 

 separating it from that genus, the generic name Porcula, by which 

 it has been known since Hodgson first described it, m.ust be aban- 

 doned unless hitherto unobserved or at least unrecorded differences 

 should present themselves in the organs yet to be examined which 

 would justify the retention of the name. 



