Family HAPLODONTID^. 



= Gonns JploihmUa, Richardhon and Authors (we beyond). 



< Soltirida or CtutorUa, of some Authoiw. 



< Cailorina, Baird, Hamm. N. Am. 1H&7, 350 (nnitod with Cattor in a subfamily C<utori»a of SiAuHia). 

 = Jlaphodotiiida, Lilukdoro, Syit. Ofv. Onag. D&kh^IJ. 1806, 41 (oa family of tlie HyBtricomorph scries). 

 = naploodonlida, Qiix, Arrons. Fam. Hamm. 1S73, 22 (as family of a special series, Baploodontoidva). 



== Baplodoniida, Alston, Proo. ZoCl. Soo. Lood. 1870, 78 (oa family of Uie Soiuromorpli series). 



CBkUB.— Teeth: I.{^\; C.§£|; Pm.?^; M. |^=?4=U=22; all root- 

 less, prismatic, simple, of unique pattern of the molar crowns. Vertebra: C. 7 ; 

 D. 13; L. 6 ; S. 5 ; Cd. 11 = 42. Seventh cerctc/i/semicostiferous, without ver- 

 tebrarterial canal. Clavicles perfect. Scapula triangular, with prominent spine 

 and well-developed acromion and coracoid. Tibia and Jibula not anchylosed, 

 though closely apposed below. Ulna with long olecranon; radius perfect, 

 admitting of rotatory movements. Carpus and tarsus each with nine bones, 

 including an os intermedium. Humerus with well-developed greater and lesser 

 tuberosities, deltoid ridge, and tubercle ; the inner condyle perforate. Femur 

 with prominent greater and lesser trochanters, glutseal ridge and tubercle. 

 A large osseous patella. Pelvis straight and narrow ; ilia prismatic, project- 

 ing beyond the sacrum. Thorax capacious, contracted anteriorly, with 13 

 ribs, 7 sternal, the first borne partly upon the last cervical vertebra. Skull 

 with no trace of postorbital processes (so conspicuous in Sciurida), massive, 

 greatly depressed, very broad behind; zygomata widely separated behind, 

 chiefly constituted by the malars. Anteorbitai foramen low in position, small, 

 oval, oblique, transmitting a fascicle of the masseter. Lachrymal large, scale- 

 like. Nasals broad, not protrusive. Mandible massive, the descending ramus 

 broadly laminar, twisted into the horizontal plane; coronoid h\gh, falcate. A 

 large hyoid, connected with the skull by long osseous cornua. Right lung 

 quadrilobatp ; l^ lung bilobate. Salivary glands enormous (as in Castorida). 

 Stomach with the cardiac portion produced into a horn-like process. Liver 

 quadripartite, the led lobe with a long process, the Spigelian lobule bifid. 



549 



