Proceedings of the General Meetings for Scientific Business of the Zoological Society of London 1894

Page 426

362 PROF. K. VON BARDELEBEN ON THE [Apr. 17, From the pronator radii teres goes a muscular belly to the radialis internus (comp. Rodentia and Carnivora). A muscle arises from the Pp. and is inserted into the metacarpal I. (as in Carnivora)=Interosseus 0 ? There is an extensor pollicis et prcepollicis. A very strong muscle is present on the hypothenar, arising from the distal end of the pisiform and the tendon of the palmaris longus. b. INSECTIVORA.1 The "palmaris longus" gets its nerve only from the ulnaris, muscle being situated rather on the ulnar side and inserted into the pisiform. The ulnaris internus is also implanted in this bone (perhaps there are two ulnares ?) c. RODENTIA. 1. SCIURUS ARIZONENSIS. (Plate XXI. fig. 4.) (Zool. Soc. Gardens.) Bone and pad of the Pp. are large, the thumb being small; on the Pm. a large pad. The pcdmaris longus has on the wrist an aponeurotic expansion of triangular shape ; it is inserted into the Pp., Pm., the other pads of the volar manus, and the sheaths of the digits. Nerve-supply from medianus (from the ulnaris no branch being found). Very strong muscles are met with in the pad of the minimus digit, connected with the palmaris longus and the ulnaris internus ; the muscular fibres reach the Pp. N. ulnaris: the tendons of the^. digit, sublimis (phalanx II.) are weak, those of the ft. profun­dus (phalanx III.) are very strong. There is an extensor (or abductor) pollicis et prcepollicis from the ulna (comp. Herpestes). 2. BATHYERGUS MARITIMUS. On the Pp. and Pm. there are nail-like formations (comp. Pedetes capensis). Its Pm. consists of two bones (P. Z. S. 1889, p. 260) : there are also two muscles, one for each bone. AVhether these muscles be two ulnares interni or one of them be a pcdmaris longus I cannot say. Both are supplied by the ulnaris nerve. On the wrist there are five muscles :-(1) A superficial muscle running obliquely from the Pm. to the Pp. and pollex, it continues the supposed palmaris (or ulnaris int.); (2) a superficial muscle from the Pp. to the thumb (nerv. medianus); (3 & 4) deep transverse muscles on the carpal joints (nerv. ulnaris); (5) a deep muscle between Pp. and pollex. Each digit has two " interossei" or deep short flexors. Extensor pollicis et prcepollicis longus runs obliquely from 1 M y notes and sketches concerning Centetes and other Insectivora having been lost, I can for the present give these few remarks only.