i68 RECORDS OF THE AUSTRALIAN MUSEUM. 



Keij tn the tiro ^perie^i nj Chei,onia : — 



(a) — Young' with diHtinet areola^. Three ])ostu(Mihif sliieliis. 

 Cai-apaee bow-sliape«l in transverse section. Jiinil)s 



CDvered mainly b}' wrinkled skin .. 



('. ilppreifiid, Garnian. 



(h) — Yoini^^ with only very thin scales covering the scutes. 

 Four or five postoculars. Carapace tectiforin in ti-ans- 



vei'se section. Limbs covered by liard lioi-ny plates 



( '. Ill ijilii^. I>innfeus. 



Re-descript'nui ((ml »'5'i/ """,'/"*.'/ '^^ Cheloma dephessa. — The 

 dried condition ot Garman's specimens has been the cause of 

 several misleading statements. On this account j liave not 

 intercalated bis remarks in the re-description wliicli follows : — 



Chelonia pepressa, Garwati. 



(Plates xix., xxi., xxii. ; Figs. 39, 40, 41a and b, 42, 44, 4r)b, 



46b,47 a and b, 48a, 49fj. 



Chelonia ilej^fessu, Garman, Bull. Mus. Comp. Zool., vi., 1881, 



p. 124. 

 Chelo)il<i ! depres!i<i, Baur, Amer. Xat., xxiv., 1890, ji. 487. 

 CJieluite iiiijdiix, Bouleugei', Brit. Mus. Cat. Cheltmia, 1889, 



p. 183 (part). 

 Xatntor tesselldtKs, McCullocb, Rec. Austr. Mus., vii., 1908, p. 



126, pis. xxvi-xxvii. 



Head (figs. 39, 40, 41a-b) :— Very much like that of ('. 

 niijdiiii ; once and one quarter (in very young- specimens) to 

 once and one tliird as long as broad. Priefrontals only as long 

 as the supraocular, longer than tlie parietal ; sei)arated from 

 the maxilliary sheath antero-laterally by an area of smooth skin 

 wliich connects the fleshy nasal region with the soft-parts 

 surrounding tlie eye. Frontal pentagonal, longer than bi-oad ; 

 three-quarters (in very young examjdes) or two-thirds the 

 lengtl) of tlie pra?fi'ontals ; as long as oi" slightly shortei' (in the 

 oldest s[teciiucM) than the parietal. Pai-ictal broader thau 

 long, pentagonal or octagonal, smaller than in ('. iiii/dii!<. A 

 single narrow band-like post-parietal which may be divided 

 into three, is present in the young specimens ; in the oldest 

 specimen it is much broader, owing to the backward growth of 

 tlie parietal bone which it covers, but is still divideil into 

 three. In ('. iiiifdn.t I have noted the same vaj-iation in growfli 

 but in that species it is almost always paired, iu one case only 



