xviii ■ List of Illustrations. 



Fig. page 



409. Longitudinal sections of molar teeth, 4— B, various species of Mastodon, 



C Elephant . . . 511 



410. Skull of Dwiotfemum . • .512 



411. The teeth of the permanent dentition of the left half of the skull of a 



Dog, and the milk dentition of the same 51** 



412. The same of a Cat .513 



413. The teeth of the left half of the upper jaws of : A Dog, B Bear, C Marten, 



D Badger, E Viverid, .P Hyaena, G Lion 514 



414. Pes of a young Sea Elephant ... . 518 



415. Upper teeth of the Sea Elephant .... • 518 



416. Eight anterior appendage of a Pilot Whale . ■ 520 



417. SkuU of a Dolphin .521 



418. SkuU of a Mystacocete 521 



419. Diagrammatic transverse section of the anterior portion of the head of a 



• Balsenopterid. ... 522 



420. Skull of a Pilot Whale . ... . . .524 



421. A Manus of the Great Anteater, B of the Two-toed Anteater 526 



422. Eight ramus of the mandible : A oi a. Eabbit, B of an Agouti 527 



423. Transverse sections of molars of various Rodents . . • 528 



424. Left hind foot of a Maki .... 531 



425. A diagram of Appendicularia, B diagram of an Asoidian larva . 537 



426. Diagrammatic longitudinal section of an Asoidian 538 



427. Diagram of a Salpa . 540 



