112 PROCEEDINGS OF THE ACADEMY OF [March. 



breed in suitable places in the Keys, are thus subjected to addi- 

 tional danger as their eggs are also held in demand. These are eagerly 

 gathered when found and used as food. 



100. Eretmochelys imbricata (Linnseus). Hawk's Bill Turtle. 



Shells of this animal were seen in Key West. It was reported as of 

 frequent occurrence in past times. 



101. Chelonia mydas (Llnnseus). Green Turtle. Turtle. 



Hunted for food and the most familiar of the family. Several 

 times newly laid eggs, most likely of this species, were found on the 

 sandy beaches of the different Keys. 



EMYDID^. 



102. Malaclemmys littoralis rhizophorarum subsp. nov. Terrapiu. Diamond Back Ter- 



rapin. Plate IV. 



Head large, heavy, flattened somewhat above, and below, and a 

 little swollen laterally behind each eye. Eye large. Snout short, 

 and rather obtuse. Jaws each with a broad horny covering. ]\Iouth 

 large, and its profile together with mandible convex. Legs and feet 

 strong, furnished with stout claws, five on each anterior limb and four 

 on each posterior. Claws on fore feet rather broad, and those on 

 hind feet narrow and longer. Scales on limbs well developed supe- 

 riorly. Tail short, conic, and rather weak. 



Carapace slightly ovoid when viewed from above, with its greatest 

 width opposite posterior portion of fourth vertebral plate. Anterior 

 carapace a little emarginate. Carapace deepest when viewed laterally 

 about middle of its length, or tops of crests of second and third verte- 

 bral plates highest with profile sloping down gradually in front and 

 behind. Lower margin of carapace sloping gently down to a point 

 above suture of seventh and eighth marginal plates, then turns up- 

 ward and outward a little to descend again behind. Vertical and 

 horizontal measurements of marginal plates forming bridge with 

 plastron, or fifth, sixth and seventh, about equal. Edges of marginal 

 plates from sixth backwards sharp and becoming more revolute to 

 most posterior. Axillary and inguinal plates well developed. Each 

 vertebral plate, except posterior which is evenly convex, with a 

 median keel surmounted by a more or less well developed osseous 

 tubercle posteriorly, and best developed proceeding to last. Each 

 plate of carapace with conspicuous concentric rings. Plastron a trifle 

 ovoid, and its greatest width would fall a trifle in advance of its middle 

 or about middle of bridge. Front of plastron nearly truncate or its 

 anterior edge only very slightly emarginate. Behind bridge sides of 

 plastron nearly parallel to posterior margin of femoral plate where 

 there is a prominent notch, and then more convergent to ends of anal 



