Chap. IH. GENERA OF EMYDOID^E. 437 



where it ranges from Michigan, Wisconsin, and Iowa, to Louisiana. I have 

 received specimens from Burlington, Iowa, througli Dr. J. Ranch ; from Marion 

 County, Missouri, through the Smithsonian Institution ; from the Osage River, 

 through Mr. G. Stolley; from Maumee River, Ohio, through Mr. Geo. Ckrk; from 

 Arkansas, through Mr. G. Stolley, and the Smithsonian Institution. Judging from 

 the many specimens sent me by Mr. W. Sargent and Professor Wailes, it must 

 be common about Natchez. The young are represented PI. 2, fig. 10-12 ; the 

 eggs PI. 7a, fig. 31-34. The eggs vary more in form than those of Graptemys 

 geographica, as the animal itself also does. 



IV. M.vL.\cocLEMMYS, Grajj} A very distinct genus, first noticed by J. E. Gray, 

 who refers only one species to it, though I believe that his E. Bealii is the Chinese 

 representative of ours. There are no scales on either side of the neck, the 

 upper arms, the thighs, or the loose skin of the legs, but merely a tessellation 

 of the epidermis ; distinct scales only upon the legs, arms, and feet. Inguinal or 

 axillary scales small or wanting. Head long and peaked, or blunt, short, and 

 rounded.^ Horny sheath of jaws straight, strong, and smooth ; horizontal alveo- 

 lar surface flat and broad, Avithout ridges ; alveolar edges meeting at an angle 

 in the upper jaw, and tapering to a triangle in the lower. Young keeled, 

 adults tuberculated, upon the middle line. The median scales remain longer 

 broad than in any other Emydoid, indicating a lower standing, which agrees with 

 its mode of life in salt-marshes. 



Malacoclemmys palustris, Ag? Common along the Atlantic coast, in salt-marshes, 

 from New York to Texas, and even to South America. Specimens from the 

 States bordering on the Gulf of Mexico are generally smaller than those of the 

 Atlantic States, and have the edge of the carapace more turned up ; * but such 

 specimens occur even in the vicinity of New York. This species varies most 

 remarkably in its color and sculpture, as well as in the size of the head. The 

 lighter varieties are plain greenish gray, the darkest almost black ; there are those 

 with concentric stripes upon the scale.s, alternately dark and light colored ; some are 

 entirely smooth, and others have deep concentric grooves, indicating the successive 

 lines of growth of the scales. The sternum varies from light yellow or yellow- 



geographicn ; but the specific name LeSueurii is oldiT. - Tlicro is not another genus the head of uliich 



It is evident from his reference that Gray at first .ap- varies as mueli in size and form as tliis. 

 plied the name of Emys LeSueurii to tills species, and ^ IMalaclemys concentrica, Gray,C&\. Brit. Mas. 



not to Gr. geographica; now Gray calls it also Emys 1844, p. 28. It is the Testudo terrapin, Schoepff, 



pseudo-geographica. I'rof. Wailes enumerates it in Emys terrapin, Holhr., Test, centrata, Daud., Test, 



his Gcol. Report under the name of Emys serrata. concentrica, S/taw, Test. |)alnstris, Gmel. and LeC. 



' Though Gray spells this name Malaclcmys, I * This is probably the Emys areolata, A. Dum. 



have altered it to suit its etymology. Arch. Mus., vol. 6, p. 223, PI. 14. 



