456 



CHBLONIA. 



mentary small postoccipitals, resembling more or less the scales scat- 

 tered over the neck ; two, larger than the rest, are placed in immediate 

 contiguity with the posterior pair of latero-occipitals and the temporal 

 shields. The normal number of the postorbital plates is four, though 

 five may occasionally be seen on one side ; in the latter instance we 

 found the second subdivided into two. The first or lowermost is 

 elongated and the largest of its series, sometimes subequal with the 

 third, which is similarly elongated; the uppermost is the smallest. 

 The second, when undivided, is intermediate in size between the upper 

 and the lower. 



We will not proceed any further, since the specimens of the following 

 species lack the plastron, limbs, and neck. 



LOG. The specimen before us was caught in the Atlantic Ocean. 



Plate XXXI, fig. 5, represents an upper view of the head of Clielo- 

 nia marmorata, somewhat reduced in size. 

 Fig. 6, is a profile ; and, 

 Fig. 7, an under view of the same region. 



4. CHELONIA FORMOSA, Grd. 

 (Plate XXXI, figs. 1-4.) 



CHAR. SPEC. -Gapite amplissimo ; scuto verticis modico ; occipitali me- 

 diano parvo ; scutis postoccipitalibus amplissimis. /Scuto postorbitali 

 inferiori quam tres reliquos subaequales majori. Scuto temporali su- 

 periori quam reliquos sat amplos majori. Carapace subcordato, latiori; 

 tergo depressiusculo. /Scutis vertebralibus multo longioribus quam la- 

 tioribus ; marginalibus modicis, quinque et viginti. Fusca, fulvo vel 

 olivaceo maculata. 



SPEC. CHAR. Head rather large ; vertex plate moderate ; middle 

 occipital small ; postoccipitals large. Inferior postorbital larger 

 than the remaining three, which are subequal. Upper temporal 

 shield much larger than the rest, which are well developed. Cara- 

 pax subcordate, broad ; back rather depressed. Vertebral shields 



