622 CLASS XVII. 



grey, mixed with black above, red-brown along the sides, yellowish-white 

 on the belly ; 9 inches long, of which the tail forms 3, &c. 



b) With tail long, equalling or sUglitly surpassing the body, with ears 

 somewhat long. 

 Sp. Didelphis dorsigera'L., ^cwkeses. Saugeth.'Vah. 150; Surinam; — Didel- 

 phis murina L. Schkeber Sdugeth. Tab. 149, Diet. univ. d'Hist. nat., 

 Mamm. PI. 17, fig. 2; Brasil, Peru, &c. These species carry their young 

 on the back when they are sufficiently developed to leave the teat, to which 

 at first they were attached, whilst these throw their tails like tendrils round 

 the tail of the mother. 



ft With niammce contained in a pouch. {Tail long, but in many shorter 

 than body.) 



Sp. Didelphis virginiana Shaw, Buep. Suppl. vi. PI. 33, 34, pp. 240 — 243, 

 Sarigue et Sarigue a longs p)oils, Scheeb. Sdugeth. Tab. 145*, GtEOFFR. et 

 F. Cuv. Mamm. PI. 96 — 98 ; — Didelphis cancrivora Gmel., Scheeb. Sdugeth. 

 Tab. 145, Geoffe. et F. Cuv. Mamm. PI 99, Gueb. Iconogr., Mamm. 

 PI. 20, fig. I (the skeleton figured by Temm. Monogr. i. PI. 5) ; from South 

 America, brown-gi-ey, with black feet, &c. Perhaps in some species the 

 pouch is only temporally developed. T. T. Reinhaedt saw a Didelphis 

 aliiventns without pouch, notwithstanding this sj)ecies is otherwise 

 instructed with it. VidensJcabel. Meddelelfcr fra den naturh. Forening i 

 Kjobenhavn for 1854. 



Chironectes Illig. Hind feet palmate. (Manimse contained in 

 a poucli ; tail longer tlian body.) 



Sp. Didelphis palmata Geoffe., Lutra minima Zimmerm., Bodd., Chiro- 

 nectes variegatus Illig., Buff. Suppl. iii. PI. 22, Wateeh. Nat. Libr. PI. 

 4, Mamm. i. PI. 17, fig. 1; Cuv. R. Ani., ed. ill., Mamm. PI. 48, fig. 4; 

 Yapoclc, a species occurring in and near the rivers of Guiana and Brasil ; 

 it is about 2 feet in length, of which the tail forms one half. (The teeth, 

 which were described by Ogilby in a young specimen, do not differ in the 

 adult from those of the other species of Didelphis.) 



Section II. Mammalia 2ylcicentalia. 

 a) Posterior extremities none. 



Order III. Cetacea. 



Anterior feet changed into fins, posterior none^ Tail horizontal, 

 flat, continuous with trunk. External ears none. 



1 LiNNiEUS wrote "Caudaeloco pedes compedes in pinnam planam." Syst. nat. 

 ed. XII. I. p. 25. This mistake of Linn^us that the posterior extremities coalesce to 

 form the tail was not without its influence, even after the skeleton had become known, 

 in respect of the Cetacea herbivora {Sirenia Illig.) ; see Illiger Prodrom. p. 140 and 

 Fischbe Synopsis, p. 501, the last of whom copied the first-named. 



