26 CEBID.#.—SIAMIRIS. 
The Reep Ter-Trr. Callithrix donacophilus. 
*qa, b, c. Skulls. Bolivia. From Mr. Bridges’ Collection. 
The Warre-HANDED Tzz-Tzx. Callithrix moloch. 
a. Skull. Brazils. 
The Brack-HanpED TrE-Trr. Callithrix melanochir. 
a. Skeleton. From Mr. Brandt’s Collection. 
The Cortanep Tez-Tre. Callithrix torquatus. 
Callithrix amictus, Spx, Sim. Bras. pl. 38, fig. 1 (skull). 
#q, Skull. §. America. From Mr. Stevens’s Collection. 
The Coreen TeE-Tez. Callithrix cupreus. 
Spiz, Sim. Bras. pl. 38. fig. 3 (skull). 
The Buack-rrontep Tzz-Tzs. Callithrix nigrifrons. 
Spiz, Sim. Bras. pl. 38. fig. 1 (skull). 
SIAMIRIS. 
Teeth :—Incisors 5; Canines -7; Premolars 53; Molars 35 = 36. 
The Botrvran Tez-Trr. Siamiris entomophagus. 
Chenu, Encyclop. d’Hist. Nat. p. 216. fig. 177 (skull). 
Chrysothrix entomophagus, D’ Orbigny, Voy. ix. pl. 4 (skull). 
*a, b. Bolivia. From Mr. Bridges’ Collection. 
c. Voyage of H.M.S. Herald. Presented by Capt. Kellett and Lieut. 
Wood. 
The Trs-TEE. Siamiris sciureus. 
Simiee sciuree, Spix, Cephalogenesis, tab. 6. figs. 8-11 (skull), 1815. 
Cebus sciureus, Blaimv., Ost. Atl. G. Cebus, pl. 6 (skull). 
Cervical vertebre.............. 7 
Dorsal, sche -e6 eae ae Fee 13 
Luiibar | ¢swadkv acd secewka sh 7 
Sacral ...........05. ees ee 3 
Caudal sis a iees ge hg viele aro ae asain 27 
¥*q, Skull. Para. Presented by R. Graham, Esq. 
b. Skeleton. From the Zoological Society’s Collection. 
ce, Skull, Para. Presented by J. P. G. Smith, Esq. 
d, Skull. District of Quito. From Mr. Stevens’s Collection. 
