882 MH. -E. G. PARSONS ON THE [Nov. 29, 



Pedetes. The caecum is 4 inches long in Di^us jaculus ; it has a 

 much larger calibre than either intestine, but is not charac- 

 teristically coiled ; it is sacculated, and has a fold of peritoneum, 

 about I inch wide, running along one margin and ending in a 

 free border containing vessels. In the hver of Dipus jaeulus the 

 right central and right lateral lobes apparently were fused into 

 one large one ; the caudate lobe was large, and resembled that of 

 the Eabbit in shape and relations. In Dipus Mrtipes the right 

 lateral lobe was distinct, though small, and was closely pressed 

 against the caudate, so that the two lobes together made a 

 concavity for the anterior part of the right kidney. The gall- 

 bladder was well marked in both species of Dipus. 



Respiratory System. 



The Larynx shows little wortliy of special mention; the 

 arytenoids, as is usual in Eodeuts, lie at the sides of the larynx. 

 There are no false vocal cords, but the true ones are well marked. 

 The epiglottis is remarkable for a very prominent cushion. The 

 Trachea is 1| inches loug, and has 18 rings before its bifurcation. 

 Opposite the 0th ring, i. e. | inch from the cricoid, a median septum 

 commences, and after this the trachea is a double-barrelled tube. 

 The septum at first consists merely of mucous membrane,_ and has 

 a concave free edge towards the larynx ; lower down cartilaginous 

 rings are continued into it, and these eventually become double. 

 In the foetal specimen the same septum was noticed ; it reached as 

 far forward as the 3rd ring (there were 16 rings altogether). The 

 right lung has four lobes, of which one is the azygos. The left 

 lung has three. There is an eparterial bronchus on the right side. 



In the respiratory system Diptis has no septum in its trachea ; 

 the right lung has four lobes, as in Pedetes, but the left only had 

 a single lobe in Dipus jaculus and Mrtipes. 



Urino-Qenital System. 



The Kidneys are compact spheroidal bodies and are very nearly 

 on the same level ; the right renal artery is, however, rather more 

 anterior (cephalic) than the left. On section one large median 

 papilla is seen opening into the pelvis renalis, aud when this is 

 turned aside two smaller ones are found in front and behind it ; 

 there is also a small one above and below, making seven in all. 



The Adrenals are described with the vascular system. 



The Bladder was contracted in this specimen, it measured 1| 

 inches in its longest diameter ; the ureters open at the junction 

 of the anterior | with the posterior ^ of the dorso-lateral aspect. 



The Urethra is 1| inches long, and opens into the vagina | inch 

 from the vulval orifice. 



The Uterus is bicornuate, aud the foetus ^^•as situated in the 

 right cornu, the placenta being attached to the autero-external 

 part, close to the opening of the Fallopian tube. The left cornu 

 was normal aud was 1 inch long. The cervix uteri projects into 



