LIST OF PLATES. 



I. Stenocephalemys albocaudata Frick; Dasymys sp. 

 II. Stenocephalemys albocaudata Frick; Epimys tulhergi endorohce 

 Heller. 



III. Otomys jacksoni mearnsi Frick; Otomys jacksoni malkensis Frick. 



IV. Arvicanthis abyssinicus bltcki Frick; Arvicanthis abyssinicus 



mearnsi Frick. 

 V. Arvicanthis abyssinicus raffertyi Frick. 

 \'I. Diploceras osborni Peterson, Palatal view of skull. 

 VII. Diploceras osborni Peterson, type; Superior dentition of Diplacodon 



elatum Marsh. 

 \'III. Diploceras osborni Peterson, Paratype. 

 IX. Type of Diplacodon elatum Marsh. 

 X. Restoration of skeleton of Diploceras osborni Peterson. 

 XI. Heterotitanops parvus Peterson. 

 XII. Facial view of the skulls of Lasiopyga callitrichus and L. griseo- 

 viridis. 



XIII. Right lateral views of the skulls, mandible included, of Lasiopyga 



callitrichus and L. griseoviridis. 



XIV. Direct superior views of the skulls, mandible removed, of Lasio- 



pyga callitrichus and L. griseoviridis. 

 XV. Direct basal views, mandible removed, of Lasiopyga callitrichus 

 and L. griseoviridis. 

 X\T. Callithrix jacchus; Seniocebus meticulosus; Callithrix sp. ; Aotus 

 miriquouina. 

 X\'II. Callithrix jacchus; Seniocebus meticulosus; Aotus miriquouina; 



Callithrix sp. 



X\'III. Lasiopyga callitrichus. 



XIX. Lasiopyga callitrichus. 



XX. Lasiopyga callitrichus. 



XXI. Lasiopyga callitrichus. 



XXII. Homeosaurus digitatellus Grier. 



XXIII. Psectrogaster curviventris. 



XXIV. Prochilodus rubrotceniatus. 



XXV. Acestrorhynchus microlepis; Curimatus spilurus; Hiodon tergisus; 

 Curimatus microcephalus; Citharinus congicus. 



V 



