le CHELYDID&. 
bridge. Snout short, obtusely pointed, slightly prominent; head 
covered above with undivided smooth skin; sides of neck with 
conical erect tubercles. Interdigital web moderately developed ; 
three or four large transverse lamellae on the upper surface of the 
fore limb. Carapace brown; plastron brown in the adult, yellow 
spotted with brown in the young; head, neck, and limbs dark olive 
above, white inferiorly, the limit between the two colours sharply 
defined. 
Length of shell 17 centim. 
Brazil. 
a,b. 9 & her., spir. Brazil. 
Ca On Spit: Brazil. (Type of I. depressa.) 
d. Hey. stffd Brazil. 
e, Yg., shell. Brazil. Mrs. Miers [P.]. 
2. Hydromedusa tectifera, 
Hydromedusa maximiliani (non Mtk.), Wagl. Syst. Amph. p. 135, 
pl. iii. figs. 25-42 (1830) ; Peters, Arch. f. Anat. u. Phys. 1839, 
p. 260, pl. xiv. figs. 1-4; Gray, Cat. Sh, Rept. i. p. 59 (1855), and 
Suppl. p. 73 (1870), and Ann. § Mag. N. H., (4) xi. p. 802 (1873) ; 
Burmeister, An. Soc. Se, Argent. xxi. p. 5 (1886). 
Chelodina maximiliani, Dum. § Bibr. u. p. 449 (1885); Hensel, 
Arch. f. Nat. 1868, p. 555. 
Hydromedusa tectifera, Cope, Proc. Am. Philos. Soc. xi. p. 147 
(1869); Gray, Suppl. p. 73; Bouleng. Ann. § Mag. N. H. (5) 
xvi. p. 85 (1885). 
—— platanensis, Gray, Ann. § Mag. N. H. (4) x1. p. 302 (1873) ; 
Giinth. Ann. § Mag. N. H. (5) xiv. p. 428, pl. xiv. (1884). 
— wagleri, Giinth. 1. c. p. 425. 
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 irregular 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-b. 6 & yg., spir. Rio Grande do Sul. — Dr. v. Ihering eer 
ce. Eggs. Rio Grande do Sul. _—_—-Dr. v. Ihering [C. ].* 
d. 6, stfid. Buenos Ayres. (Type of H. wagleri.) 
e. 2, shell, imperfect. Rio de la Plata. M. Bravard[C.]. (Type 
of HH. platanensis.) 
FS. Yg., spir. South of Rio de la Lieut. Gairdner | P. ]. 
Plata. 
