2, THALASSOCHELYS. 185 
Chelonia caouana, Schweigg. Prodr. p. 22 (1814) ; Wagl. Syst. Amph. 
pl. i. figs. icxxvi (1830); Dum. § Bibr, ii. p. 552 (1835). 
Caretta atra, Merv. Tent. p. 17 (1820). 
cephalo, Merr, 1. e, 
Chelonia multiscutata, Kuhl, Beitr. Zool. p. 78 (1820). 
olivacea, Eschscholtz, Zool, Atl, p. 3, pl. ili. (1829); Cantor 
Cat. Mal. Rept. p. 15 (1847). 
cephalo, Temm. § Schleg. Faun. Japon., Rept. p. 23, pls. iv. & 
vi. (1833) ; Cocteau, in R. de la Sagra, Hist. Cuba, Rept. p. 39 
(1843). 
Chelonia pelasgorum, Val. in Bory, Expéd. Morée, Zool, pl. vi. (1833). 
dussumieri, Dum. § Bibr. p. 557, pl. xxiv. fig. 1. 
Caretta olivacea, Riipp. N. Wirbelth, Abyss., Amph, p. 7, pl. iil. 
(1835). 
Chelonia caretta, Bonap. Faun. Ital, (1835) ; Holbr. N. Am. Herp. 
ii. p. 33, pl. iv. (1842). 
Caouana caretta, Gray, Cat. Tort. p. 52 (1844), and Sh. Rept. i. 
p- 72 (1855), and Proc. Zool. Soc. 1873, p. 404. 
elongata, Gray, Cat. Tort. p. 53, and Sh. Rept. i. p. 73. 
olivacea, Gray, Cat. Tort. p. 63, and Sh. Rept. i. p. 73; Giinth, 
Rept. Brit. Ind. p. 52 (1864). 
Thalassochelys caouana, Agassiz, Contr. N. H. U.S. 1. p. 834, pl. vi. 
figs. 13-32 (1857). 
corticata, Girard, U. S. Explor. Evped., Herp. p. 431, pl. xxix. 
(1858) ; Strauch, Chelon. Stud. p. 187 (1862), and Verth. Schildkr. 
p- 146 (1865) ; Schreib. Herp. Eur. p. 513 (1875). 
Lepidochelys olivacea, Girard, le. p. 435; Gray, Proc. Zool. Soc. 
1873, p. 407. 
dussumieri, Girard, 1. ec. p. 437. 
Thalassochelys olivacea, Strauch, Chelon. Stud. p. 63, and Verth. 
Schildkr. p. 147. 
elongata, Strauch, Chelon. Stud. p. 63. 
Cephalochelys oceanica, Gray, Proc. Zool. Soc. 1873, p. 408. 
Fremonia elongata, Gray, l. ec. fig. 
Thalassochelys tarapacona, Philippi, Zool, Gart, xxviii. p. 84 (1887). 
Carapace of young with three strong keels, of adult arched or 
subtectiform ; dorsal shields juxtaposed ; margin serrated posteriorly 
in the young, formed of 27, or rarely 25 shields. Intergular shield 
very smal] or absent. Head large, with very strong, hooked jaws ; 
symphysis of lower jaw very long; alveolar surface of horny beak 
with a median ridge, of jaws without; two pairs of shields anterior 
to the azygous frontal. Limbs of young usually with two claws, of 
adult frequently with but one. Young uniform dark brown or 
blackish ; adult brown above, yellowish inferiorly. 
Length of shell 1 m. 5 centim. 
Tropical and subtropical seas; Mediterranean; an accidenta 
visitor in the North. 
The enormous amount of variation in the large series of Logger- 
head Turtles in the Museum leaves no alternative but to further 
multiply the number of species, or to admit only one. I have 
adopted the latter course. 
a,b, c,d. Her. & yg., stffd. Atlantic Ocean, 
e. Ad., shell. Coast of Devonshire. W.Wilson, Esq. [P.] 
