2J2 CHELYDIDiE. 



bridge. Snout sliort, obluscly poiutcd, slightly prominent; head 

 covered above Avith undivided smooth skin ; sides of neck with 

 conical erect tubercles. Iiiterdigital web moderately developed ; 

 three or four large transverse lamelhc on the upper surface of the 

 fore liml). Carapace brown ; plastron brown in tlie adult, yellow 

 spotted with brown in the young; head, neck, and limbs dark olive 

 above, white interiorly, the limit between the two colours sharply 

 defined. 



Length of shell 17 ccntim. 



Ijrazil. 



a, b. 5 & ligr., spir. Ijrazil. 



c. 5 , ppir. Brazil. (Type of H. depressn.') 



d. llgr. f-tffd Brazil. 



e. Yg., shell. Brazil. Mrs. Miers [P.]. 



2. Hydromedusa tectifera. 



Hvdromedusa maximiliani {no7i Mik.), Wat/l. Syst. Amph. p. L3.5, 

 pi. iii. figs. 25-42 (18;J0) ; Peters, Arch. f. Anat. v. P/ii/s. 1839, 

 p. 2.-0, pi. xiv. figs. 1-4 ; Grai/, Cat. >S//. licpt. i. p. 50 (1855), and 

 Hxppl. p. 73 {1870), cmdAjin.'i!)- May. N. II. (4) xi. p. 302 (1873) ; 

 Bitrmeistei; An. Soc. Sc. Aryent. xxi. p. 5 (1880). 



Chelodina maximiliani, Bum. ^- Bihr. ii. p. 449 (1835) ; Hensel, 

 Arch.f. Aat. 1808, p. 355. 



Ilydioiiiedui^a tectifera, Cojje, Proc. Ain. Philos. Soc. xi. p. 147 

 (18(39); Gray, Svppl. p. 73; Boideny. Ann. ^- 3Jay. N. H. (5) 

 xvi. p. 85 (1885). 



platanensis, Gray, Ann. ^- Maq. N. H. (4) xi. p. 302 (1873) ; 



Gunlh. Ann. tS; May. N. II. (5) xiv. p. 423, pi. xiv. (1884). 



wagleri, Giinth. I. c. p. 423. 



Each dorsal shield, in the young, concentrically striated and with 

 a conical central nodosity ; these nodosities disappearing in the 

 adult, except on the hinder shields. Upper surface of head reticu- 

 lated or divided into numerous small irregidar shields. Digits ex- 

 tensively webbed. Carapace dark brown ; plastron yellowish, with 

 dark brown spots in the young : head and neck olive, with a broad, 

 white, black-edged, lateral band, and a curved white streak on each 

 side of the throat. 



Length of shell 20 centim. 



Southern Brazil to Buenos Ayres. 



a-h. (S & yg., spir. Bio Grande do Sul. Dr. v. Iliering [C.l 



c. Eggs, Bio Cirande do Sul. Dr. v. Ihering [C.J. 



d. cJ, stffd. ]3ufnos Avres. (Type of //. ira(/le>-i.) 



e. 2 , sbell, imperfect. Bio de la Plata. M.Bravard [C.]. (Type 



of H. j)Jatanensis.) 

 f. Yg., spir. South of Bio de la Lieut. Gairduer [P.]. 



Plata. 



