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Show 1895.] ANATOMY OF CHAUNA CHAVARIA. 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 forks-part, as in Palamedea, being attached to a knob on the outer side of the tarso-metatarsus, part going to the fascia covering the ankle-joint. 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 iu Palamedea, but which Garrod did not find in 0. derbiana, is present in C. chavaria. The 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. SKELETON. I add a few notes on tbe points of difference and resemblance in the skeletons of Palamedea and the two Chaunas. In Palamedea the whole skeleton is the slightest of the three, and its long bones are the longest. G. derbiana has the heaviest skeleton and its long bones are the shortest. C. chavaria is intermediate. Sternum. G. chavaria has the posterior lateral processes shortest; Palamedea intermediate; G. derbiana longest and most anserine. In the Chaunas the inner anterior surface of the sternum is pneumatic. It is not so in Palamedea. Vertebrae and Ribs. In Palamedea and 0. chavaria there are 16 cervical vertebra? without movable ribs; in 0. derbiana 17. Then follow two dorso-cervicals with free movable ribs, the 17th aud 18th in Palamedea and C. 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 C. derbiana, on vertebrae 20 to 27. Lastly, there follows au 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 G. 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 G. derbiana the corresponding vertebra is the thirty-second. In C. derbiana the penultimate sternal rib has a sharp backwardly 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 iu the Chaunas. Pelvis. The waist is broad in Pcdamedea, narrow in C. derbiana, intermediate in C. chavaria. |