REPORT ON ZOOLOGY. IGI 



Cetacea. Desmarets, in his Mammalogie, published in 1820, 

 follows Cuvier. Blainville* distributes the Mammalia pri- 

 marily into the two subclasses of Monodelphes and Didelphes, 

 this last being instituted for the reception of the Marsii- 

 pialia, and Monotremata of Geoffroy. His subclass of Mono- 

 delphes includes seven orders ; of these the first five are the 

 same as Cuvier's, only the Rodentia and Edentata are trans- 

 posed, and the latter includes the Cetaceous animals, with the 

 exception of the Lamentines : these last, with the P roboscidiens 

 of Cuvier, form his sixth order, called Gravigrades : his se- 

 venth order, Ongulogrades, comprises the rest of Cuvier's 

 Pachydermata and his Ruminantia. Latreillef considers the 

 Monotremata as a distinct class altogether. His class Mam- 

 malia comprises Cuvier's eight orders, besides the three ad- 

 ditional ones of Cheiroptera, Amphibia, and Marsiipialia (in the 

 R^gne Anim. only subordinate groups in the order CarnassiersX.) 

 Mr. MacLeay, in a paper in the Linncean Transactions^ already 

 alluded to in a former part of this Report, dated 1826-7, adopts 

 as primary divisions the old groups Primates, Feraz, GUres, 

 Ungulata, and Cetacea, the first three, and last, being identical 

 with the four Linnaean orders bearing the same names, the fourth 

 (adopted from Aristotle and Ray) including the Linnaean orders 

 BriitcB, Pecora, and Belliice. Mr. MacLeay has made some im- 

 portant and interesting remarks on the series of affinities con- 

 necting the above orders which deserve to be consulted, but which 

 would occupy too much room here. He attempts to show that 

 the chain returns into itself, forming a circle. He considers 

 the whole class as passing off to the Birds by the Glires\\, and 

 as also indicating an affinity to the Reptilia in the Monotre- 

 mata, In 1827, Temminck published the first part of his valu- 

 able Monographies de Mammalogie, at the end of which he 

 gives a systematic arrangement of the whole class. He adopts, 

 in addition to Cuvier's orders, those of Cheiroptera and Mono- 

 tremata : the former is inserted between the Quadrumana and 

 Carnivora ; the latter is placed at the end of the whole series, 

 as serving to pohit out the transition to Reptiles and Birds. 



* Principes, SfC, tab. 3. t Fam. Nat. 



X Latreille thinks that at the end of the Quadrumana, the Mammalia divide 

 themselves into two series: one composed of the Cheiroptera, Marsupialia, 

 Rodentia, and Edentata ; the other of the Fera; Amphibia, Pachydermata, 

 Ruminantia, and Cetacea. See Fam. Nat., p. 59, note (}). 



§ voh xvi. p. 1. 



II The analogy which exists between the organization of the Mammalia 

 Rodentia and that of Birds, was pointed out by Professor Otto of Breslau the 

 same year. HeeBull. desSci. 1827, torn. xii. 

 1834. M 



