VI 



EXPLANATION OF THE PLATES. 



PLATE IX. 



Fig. 1. Tibia of Laelaps aquilunguis, the inner side. 1 a, the same, anterior view. Size one-fourth nature. 

 1 c, distal extremity of the tibia. 



Fig. 2. Fibula of the same, seen from the tibial or inner face. 



Fig.. 3. Astragalus of the same, anterior view. One-third natural size. 8 «, external view. 8 b, inner extremity. 

 3 c, ascending apophysis. 



Fig. 4. Distal caudal vertebra of the same. One-half natural size. 



PLATE X. 



Fig. 1. Penultimate phalange of Laelaps aquilunr/uis, lateral view. Natural size. 



Fig. 2. Ungueal phalange of the same, lateral view. Natural size. 



Fig. !3. Humerus of Laelaps aquilinyuis, external view. One-half natural size. 3 a, same, posterior view. 



Fig. 4. Ischiadic bono of the same, the inner side. One-third natural size. 



Fig. 5. Fragment of right ramus of the mandible of the same, with functional and succcssional teeth. One-half 

 the natural size. 



Fig. G. Crown of a succcssional tooth of the same jaw (seen in Fig. 5 behind the second tooth). Natural size. 

 (The artist has represented the denticulate mx liner than in nature.) 



Fig. 7. Beak of the Eocene fish Coelorhynchus omatus, Leidy. From near Petersburg, Va. From the collection 

 of John 8. Haines, Gcrmantown, Pa. The bones of the Laelaps figured in Plates VIII., IX. and X., are those of the 

 type specimen from Barnesboro, N. J, 



PLATE XL 



Fig. 1. Mandible of Lytoloma angusta, Cope. One-half natural size. Lateral view. 1 «, Same, from above. 

 1 b, median lateral marginal bono, lateral view. 



Fig. 2. Posterior part of carapace of Taphrosphys sulcatum, Leidy. One-fourth natural size. The inner or 

 inferior view. (The artist has omitted the distal part of the iliac scar on the left middle costal bone of the plate. 



Fig. 3. Cervical vertebra of llyposaurus rogersii from behind. Natural size. 



Fig. 4. Laelaps aquiltmrjuis. Extremity of non-anchyloscd sacral vertebra of type specimen. One-third natural 

 size. 



Fig. 5. Lateral view of a second sacral vertebra of same. 5 a, superior aspect of the same. 



Fig. G. Mosasaurus depressus, os quadratum, distal extremity and part posterior hook broken off; external 

 view ; one-half natural size ; from type specimen from Burlington Co., N. J. 



Fig. 7. Mosasaurus maximus, os quadratum with the posterior proximal hook broken off; one-third natural 

 size; external view. Museum Kutger's Collogc. 



Fig. 8. Suspensorium of Mosasaurus perhaps M. dehayi, from above ; 5-11 th, natural size ; 8a, posterior part 

 of the squamosal bone of the same specimen, in natural relation, except its removal to a short distance to show the 

 entering angle of the opisthotic. 



Fig. 0. Long bone (?) of the pelvis or limbs, of Rhabdopelix lomjupinu, from the Trias. On the same block 

 of sand stone is the section of a vertebra ; natural size. 



