C 437 ] 



V. On the Intestinal Tract of Mammals. 

 By P. Chalmers Mitchell, M.A., D.Sc., Secretary to the Soc 



Received and read June 6th, 1905. 



[Text-figures 1-50.] 



Contents. 



Introduction 438 



Morphology of the Intestinal Tract 438 



Systematic Description 442 



MONOTREMATA 442 



MARSEPIALIA. 



Didelphyidae 445 



Dasyuridae 446 



Peramelida3 446 



Phascolarctidas 449 



Phalangeridas 449 



MONODELPHIA. 



Tr/BTJXIDENATA 453 



Orycteropodidas 453 



Pholidota. 



Manidae 454 



Xenarthra. 



Bradypodidse 455 



Myrmecophagidaa 455 



Dasypodidae 458 



Htracoidea. 



Hyracidaa 460 



SlKENIA. 



Manatidae 464 



Halieoridae 465 



Rhytinidae 465 



Peobosctdea. 



Elephantida; 466 



C'etacea. 



Delphinidae 467 



Aeiiodacttla. 



Hippopotamidas 469 



Suidie 469 



Tragulidae 471 



Camelidaa 473 



Cerridse 474 



Bovidae 474 



Giraffidie 474 



Peiussodactyla. 



Tapiridai 470 



Ithinocerotidae I~ s 



Equidse 480 



Rodbntia. 



Sciuroidea 480 



Castoroidca 482 



Myoxoidea 482 



Dipodoidea 482 



Myoidea 482 



vol. xvii.— part v. No. 1. — December, 190 



Page 



Hystricoidea 484 



Ochotonidaa 488 



Leporidos 488 



Insectivora. 



Tupajidas 490 



Macroscelidida3 490 



Talpidae 490 



Soricidte 490 



Erinaceidae 491 



Centetidae 492 



Chikoptera. 



Megachiroptera 492 



Microchiroptera 492 



Galeopithecidje 493 



Carnivora. 



Otariidae 493 



Tricheehidae 493 



Phocidas 493 



Mustelidae 495 



Procyonidas 496 



Ursidse 49S 



Canidae 498 



Hysenidae 498 



Viverridas 500 



Felidae 501 



Peosihls;. 



Tarsiinse 503 



Lemurinae 503 



Indrisinae 503 



Chiromyinae 505 



Galaginos 507 



Lorisinos 508 



SiMLas. 



Hapalidas 508 



Cebidae 509 



Cercopithecida; 511 



Hylobatidse . . . . ■ 512 



Ant hropomorpha) 513 



Hominidae 515 



Homology of the Mammalian Csecum 515 



Eorm and Function of the Coocum 522 



.Secondary Relations between the Proximal and 

 Distal Portions of the Intestinal Tract .... 524 



Homoplastic Modifications 526 



Summary of Systematic Inferences 52S 



General Conclusion 534 



List of References 535 



5. 3n 





