PLATE XLIV. 
AH the figures on this plate are of the noJiiral size, excepting Fig. 8 b, which is one and one-half natural size. 
Fig. 1. Inf<3iior iucisor tooth of Calamodoii arcamocnus, which wasfouml alouo, seen from the side; a, au- 
tei'ior, b, proximal, and, c, posterior views. 
Fig. 2. Inferior incisor of an isolated individual of Calamodon simplex, seen from the side; a, anterior 
view; b, proximal view, giving section ; c, posterior view. 
Figs. 1. Teeth of one individual of Calaniodon simplex. 
Fig. 3. Jlolar tooth, outer side; a, inner side ; b and c, anterior and posterior A'iows ; d, triturating sur¬ 
face of the crown. 
Fig. 4. Portion of the inferior incisor tooth, including only the enamel-covered face; a, from front; b, 
section ; d, lateral view. 
Fig. 5. A superior incisor of auotlier specimen of Calaniodon simplex, lateral view. 
Fig. 6. An isolated superior molar of a species of Calaniodon, worn by prolonged use, lateral view ; a, ex¬ 
ternal side; 6, triturating face; c, base of fang. 
Fig. 7. Fragment of an iucisor tooth of uncertain reference, from the side ; a, anterior face ; h, section at 
eml of shaft. 
Fig. 8. Superior maxillary bone of Plesiarctomgs baceatas, from below ; a, from the outer side ; b, inferior 
aspect, enlarged one-half. Pago 171. 
Fig. 9. Left mandibular lamus of Plesiarctomgs delicatissimus, inner side; a, outer side; b, superior view. 
Pago 172. 
1'Tg. 10. Left ramus of mandible of Piesiarctomys deZicatior, inner side; a, outer side; 6, superior, c, iiferior 
views. Page 172. 
Fig. 11. Right ramus of Plesiarctomgs dclidatior, from within; b, from above. 
Fig. 12. Right inferior incisor of P/csiarctomys delicatissimus, front and side views. 
