84 Dr. C. Collingwood on Recurrent Animal Form, 



aberrant animal, falsely called the Flying Squirrel (Galeopithe- 

 cus), is the representative of the Order Cheiroptera, or Bats. 



Among the Pachyderm ata are some no less striking examples 

 of species homomorphic with those of other Orders. Thus the 

 Hyrax, an animal in structure intermediate between the Ilhino- 

 ceros and Tapir, a miniature Rhinoceros, as it has been called, 

 yet so closely resembles the Rodentia in its outward form, that 

 it was long classed with them ; and Cuvier makes the following 

 remark concerning it: — " There is no quadruped," he says, 

 "which proves more forcibly than the Daman [Hyrax capensis) 

 the necessity of having recourse to anatomy as a test by which 

 to determine the true relationship of animals." 



The general resemblance between the Cetacea and the Pinni- 

 grade Carnivora (Seals) need only be referred to ; it is made 

 very distinct through the herbivorous family Manatidre, espe- 

 cially the Dugong (Halicore Dugong). 



We have seen how the Loris resembles the Sloth ; and on the 

 other hand, the Edentate genus Bradypus (Ai) bears a singular 

 resemblance to Monkeys in general, even in that particular 

 which is so characteristic of them, viz. their physiognomy, while 

 it has a carnivorous homomorph in the Sloth Bear (Ursus labia- 

 tus), called by Pennant the Ursiform Sloth, and by Shaw, 

 Bradypus ursinus. 



The Insectivora are connected through the Hedgehog (Eri- 

 naceus europaus) with one of the most anomalous of animals, 

 the singular Monotreme genus Echidna, which has, besides, 

 other homomorphs, to be afterwards mentioned; and further 

 through the Shrews (Soricidce), with the Rodent genus Mus -, 

 and with the Carnivora by the Bulau (Gymnura Rafflesii), for- 

 merly described as a Viverra. 



The Rodentia are united homomorphically with the Pachy- 

 dermata by means of the Capybara (Hydrochosrus Capybara), 

 formerly called, from its pig-like appearance, Porcas fluvia- 

 tilis (Fermin), Thick-nosed Tapir (Pennant), Cochon d'eau 

 (Desmarchais), and Sus maximus palustris (Barrere). By the 

 Flying Squirrel (Pteromys) they claim some homomorphic affi- 

 nity with the Cheiroptera ; but their chief hoinomorphism is 

 with the Marsupialia, and most striking are the resemblances. 

 Not only do the Rodentia and Marsupialia bear a general 

 mutual resemblance throughout, both Orders possessing that 

 extraordinary development of the hinder extremities and tail 

 which enables the Jerboas, in common with Kangaroos, to take 

 such wonderful leaps, but there are particular animals in both 

 Orders which bear a most remarkable resemblance to one an- 

 other. Thus, the Rodent Jerboas (Dipus) are closely imitated 

 by the Tufted-tailed Rat-Kangaroo (Hypsiprymnus penicillatus. 



