2. Tn.vLAssocnELYs. 185 



Chclonia caouana, Srhircinf/. Prodi: p. 22 (1^14) ; Jfw//. S'l/st. Ainph. 



pi. i. figs, i-xxvi (ls:50) ; Jhnn. ^S' Bihr. ii. p. o.j2 (\6-'>o). 

 Caretta atra, Men: Tent. p. 17 (1820). 



fcplialo, Mcrr. I. c. 



Chelouia imilti.-ciitata, Kuhl, Pwitr. Zool. p. 78 (1820). 



olivaci'a, E,-ichM]toltz, Zoid. Atl. p. '■*>, pi. iii. (1820) ; Cantor 



Cat. Mai. lirpf. p. 1:5 (1847). 



ceplialo, Ti'inm. Sf- Scftlc;/. Faun. Japon., liept. p. 23, pis. iv. & 



vi. (18:}:5) ; Cucteatt, in Ii. do la Saara, Hist. Cuba, Rept. p. o-") 



(184_;3). 

 Cheloniapelasgorum, Val. m Bonj, Fjxpcd. Morcc, Zool, pi. vi. (183.j). 



iliissiiniieri, Dum. !^- liiltr. ]>. 557, pi. xxiv. lig. 1. 



Caretta olivact'a, liiijip. N. Wirbclth. ^Lbi/ss., Amph. p. 7, pi. iii. 



(18:55). 

 Clieloiiia caretta, Boiiap. Faim. Ital. (18-"j5) ; Ilolbr. N. Am. llcrp. 



ii. p. 3.3, pi. iv. (1842). 

 Caouana caivtta, (rra;/, Cat. Tort. p. 52 (1844), and Sh. Rept. i. 



p. 72 (1855), and I'mc. Zool. Soc. 1S73, p. 404. 



elijDgata, Gray, Cat. Tort. p. 53, and Sh. Rept. i. p. 73. 



olivacea, Graif, Cat. Tort. p. 53, and Sh. Rept. i. p. 73 ; Giinth, 



Rept. Brit. iHd.'-p. 52 (18(i4). 

 Thalassochelys caouaaa, Ayassiz, Contr. N. H. U. S. i. p. 384, pi. vi. 



figs. 13-32 (1857). 

 corticata, Girard, U. S. Explor. Erped., Herp. p. 431, pi. xxix. 



(1858) ; Sfrauch, Ch>d„n. S/ud. p. 187 (18G2), and Verth. Schildkr. 



p. 140 (18i;5) ; Schreib. Herp. Bur. p. 513 (1875). 

 Lepidoehelvs olivacea, Girard, I.e. p. 435 j Gray, Proc. Zool. Soc. 



1873, p. 407. 



■ dussuiiiieri, Girard, I. e. p. 437. 



Tlinlassoclielys olivacea, Strauch, Chelon. Stud. p. G3, and Vertli. 



Schildkr. p. 147. 



elongata, Strauch, Chelan. Stud. p. 03. 



Cephalocbelys oceanica, Gray, Proc. Zool. Soc. 1873, p. 408. 



Eremonia elongata. Gray, I. c. tig. 



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 rai'ely 25 shields. Intergular shield 

 very small 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. Ilgr. & yg., stffd. Atlantic Ocean. 



e. Ad., shell. Coast of Devonshire. "NY. Wilson, Esq. [P.] 



