436 ON THE CARPUS OF CTENOilYS. [-^P>"- 1^) 



centralo-trapezoid, viz., the result of a fusion of these two ossides, 

 which remain distinct in Bathi/ergus H.nd Gcorijchus ; and that like- 

 wise ia the tarsus of Myoscalops the single bone is a scapho-meso- 

 cuneiforme. However, on examining closely the tarsus of 

 Mi/oscalojis, I discover au almost imperceptible ossicle, comparable 

 to a minute pin's head, attached to the proximo-tibial angle of the 

 second metatarsal ; this cannot well be anything else than the greatly 

 reduced mesocuneiform, whose place and function has devolved on 

 the enlarged navicular. AVe may further conclude, 2Jer analof/iam, 

 that the single bone in the carpus of Myoscalops is not a compound 

 of the ceutrale with the trapezoid, but that the former has usurped 

 the place of the latter, which has either completely vanished, or 

 had become so minute that it was removed iii the cleaning of the 

 carpus. 



The same rensonius: cannot however be resorted to in the case 

 of the supposed lunar of the above-mentioned Muridae, because in 

 Lepidohmur I have come upon an ossicle {x, fig. 6), occupying 

 exactly the same position on the palmar side as in the Kodents ; 

 whereas in Lejndoltnmr an undoubted lunatiun is present besides. 

 AVe must therefore look elsewhere for the bomologue of the 

 accessory ossicle of Muridae, Lepidoleniur, and possibly also of the 

 above-named Marsupials. 



Kohlbriigge describes and figures in the carpus of HyJohates 

 syndavtylus a small bone, situated between the radius and the 

 ulnare ; "a fibrous ligament connected the ossicle with the radius 

 and the ossiculum Daubentonii, cartilaginous tissue intervening 

 between both."" Kohlbriigge calls the ossicle '•ossiculum Cam- 

 perii," the here following description by^ Camper of a similar 

 occurrence in the " Mandi'ill " referring apparently to the same 

 ossicle : " In the manus of the Mandrill I found on Feb. 9th, 1779, 

 a fourth supernumerary ossicle in a hgament, \\hich took its 

 origin from the outside of the triquetrum and was inserted on the 

 navicular, which latter was fastened to the radius by a small liga- 

 ment."^ Thilenius identifies this ossiculum Cam peril with the 

 " intermedium antebrachii " of the human embryo ^, which in one 

 instance was found in adult man by Pfitzner '. The last-named 

 author found besides an "intermedium antebrachii" in the left 

 fore-limb of a Pha.tcoloriiys^ ; the specimen is figured by Thilenius'^ : 

 it presents itself in the form of " a roundish ossicle, situated 



^ J. H. F. Kohlbruprge : " Versucb einer Anatouiie des Genus Hylubates." 

 M. Weber, Zool. Ergebu. einer Eeise in Niederljindisch Ost-Indien, i. pp. 338, 

 339, pi. svii. fig 10 (1890-91). 



* ' Naturkundige Verhanr)elingen vau Petrus Camper over den Orang Outang 

 etc.,' p. 87, footnote (b) (1782). 



^ G. Tbilenius : '" Das Os intermedium antebrachii des Menschen," Morph. Arb. 

 V. p. S(18Vi5); id., •' Unters. lib. d. morphol. Bedeut. accessor. Elemeute am 

 menschl. Carpus (und Tarsus)," Morph. Arb. v. p. .iOl (1896). 



* W. Pfilzner, in Verb. Anat. Ges. 7. Vers. Gottingen, p. 191 (1893) 

 ("Triquetrum secundarium") ; id., Morph. Arb. iv. p. 505 (1895). 



* Verb. Anat, Gcs. 7. Vers. Gottingen, I. c. 

 ^ Morph. Arb. v. pi. i. fig. 12 (1895). 



