HKRPETOLOGY OF PORTO RICO. 

 Alsophis antillensis ( lontinued. 



707 



Musciiiii. 



Hamburg.. 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



No. 



2414a 



24146 

 2416a 



24166 

 2339a 

 23396 

 2539a 



25396 



2620 



2898 



Age Mild sex. 



Locality. 



St.Thoirms 



.do., 

 .do.. 



.do... 

 .do... 

 .do... 

 .do... 



.do... 



.do... 



.do... 



When col- 

 lected. 



. ISiMi 



-, 1896 

 -, 1896 



-, 1896 

 -, 1895 

 -, 1895 

 -, 1896 



-, 1896 



-, 1897 



-, 1898 



Remarks. 



Order CHELONIA. 



The turtles of Porto Rico, with the exception of the pond turtle 

 (Pseudemys palustris), are strictly marine forms, whose limbs are 

 specialized to the extent of having become paddles, the individual 

 digits being externally obliterated, or nearly so. 



Altogether only five species have been recorded from the island and 

 its coasts, namely, four marine turtles and one fresh-water species, 

 each belonging to- a separate genus. They may be easily told apart by 

 the following 



KEY TO THE TURTLES REPORTED FROM PORTO RTCO. 



a 1 Shell without large horny shields; no claws; back with 5 longitudinal ridges 



(tig. 175) Dermochelys coriacea, p. 708. 



o 2 Shell covered with large horny shields; digits with at least one claw; back with 

 at most 3 longitudinal keels (fig. 187). 

 b 1 Limbs with well-developed digits, five on each foot (fig. 184) 



JWuilemys paluslris, p. 710. 

 6 s Iambs paddle-shaped without separate digits (fig. 197). 



c 1 At least five pairs of costal shields (fig. 187) Caretta caretta, p. 715. 



c 2 Four pairs of costal shields (fig. 193). 



d 1 One pair of prefrontal shields ( fig. 191 ) ( luionia mydas, p. 716. 



d? Two pairs of prefrontals ( fig. 195) Eretmochetys imbricata, p. 719. 



Genus DERMOCHELYS" Blainville. 



lSlfi. Dermochelys Blainville, Bull. Soc. Philom. Paris, 1816, p. Ill (type 



Testudo coriacea). 

 1820. Sphargis Meerem, Syst. Amph., p. 19 (same type). 



adipjua, skin; ^e'Au?, turtle. 



