1895.] AKATOMY OF CBAJTSA CHAVABIA. 357 



Peroneus longus. The fork to the ankle-cartilage consists of four 

 separate branches, becoming wider from above downwards. 



Peroneus brevis. The tendon of insertion forlis — part, as in Pah- 

 medea, being attached to a knob on the outer side of the tarso- 

 metatarsus, part going to the fascia covering the ankli^-joiut. 



Flexor perforans et perforatus indicis has an additional origin 

 from the end of the tibia. 



Flexor longus hallucis. The general arrangement is as in Palamedea, 

 and the slip to the toe from below the vinculum, which we found 

 in Palamedea, but which Garrod did not find in C. derhiana, is 

 present in 0. chavaria. Tlie vinculum consists of two slips. 



Abductor annularis is as in Palamedea, but in our paper we 

 called two muscles the adductor annularis. The first of these is 

 the abductor. 



Skelei'on. 



I add a few notes on the points of difference and resemblance 

 in the skeletons of Palamedea and the two Ghaunas. In Palamedea 

 the whole skeleton is the slightest of the three, and its long bones 

 are the longest. C. derbiana has the heaviest skeleton and its 

 long bones are the shortest. C. chavaria is intermediate. 



Sternum. 0. cJiavaria has the posterior lateral processes shortest ; 

 Palamedea intermediate ; C. derbiana longest and most anserine. 

 In the Chaunas the inner anterior surface of the sternum is pneu- 

 matic. It is not so in Palamedea. 



Vertehrce and Ribs. In Palamedea and C. cJiavana there are 

 16 cervical vertebrae without movable ribs ; in C. derbiana 17. 

 Then follow two dorso-cervicals with free movable ribs, the 1 7th 

 and 18th in Palamedea and 0. chavaria, the 19th in C. derbiana. 

 Then follow complete ribs articulating with sternal ribs ; 7 on 

 vertebrae 19 to 25 in Palamedea ; 8 in C. chavaria, on vertebrae 

 19 to 26 ; 8 in O. derbiana, on vertebrae 20 to 27. Lastly, there 

 follows an incomplete rib, of which the articular surfaces are much 

 reduced, and which meets a sternal rib that is attached not to the 

 sternum, but by a fibrous connection to the side of the preceding 

 sternal rib. In Palamedea this is borne on the 26th vertebra ; in 

 C. chavaria upon the 27th ; in the skeletons of C. derbiana that I 

 have seen it was not present, but its attachments are so slight 

 that it might easily have been lost in maceration. In Palamedea 

 the rib on the 23rd vertebra is the most anterior covered by the 

 ileum ; in the Chaunas it is the 25th. In Palamedea and 

 C. chavaria the thirty-first is the last vertebra with a transverse 

 process anterior to the acetabulum ; in O. derbiana the corre- 

 sponding vertebra is the thirty-second. 



In C. derbiana the penultimate sternal rib has a sharp back- 

 wardly directed process near the articulation with the costal rib ; 

 this is absent in Palamedea and in G. chavaria. 



Clavicle is V-shaped in Palamedea ; U-shaped in the Chaunas. 



Pelvis. The waist is broad in Palamedea, narrow in C. derbiana, 

 intermediate in C. chavaria. 



