100 ON TEXAN REPTILES. 



Emys or Emydes of Brongniart. If we are to discard it, 

 the next available name would seem to be Emydoides 

 (orig. Emyoides) of Gray, 1844; or if this be put aside 

 for lack of a diagnosis we shall have to adopt Onychotria 

 of Gray, 1849, which is manifestly inappropriate for the 

 majority of the species to be included. 



TRACHEMYS TROOSTII Holbr. ; Ag. 



These examples do not differ greatly from others taken 

 in Mississippi. There is some variation among the speci- 

 mens in regard to the narrow longitudinal lines on the 

 head and neck, one having them broken up into mottlings. 

 On the sides of the head and beneath, the lines are more or 

 less irregular and broken. The scales of the carapace 

 have black margins. In general the appearance is very 

 dark, almost black. Under the plastron there is a con- 

 siderable of a mixture of dark brown, brownish and yellow 

 of various degrees of depth, the darkest color following 

 the sutures. One of the shells measured nine inches in 

 length by six and seven-eighths in width. 



A lot of nine eggs was taken, on the twenty-third of 

 May, which presumably belongs to this species. The 

 shape is similar to that of Plychemys mobiliensis, as 

 figured by Agassiz ; the size is a little greater. The largest 

 in this lot measures one and eight-tenths inches in length 

 by one and one-tenth in width. The smallest was one and 

 sixty-five-hundredths inches by one inch. Another lot 

 contained eleven eggs ; the largest, one and sixty-three- 

 hundredths inches by one and four-hundredths ; the small- 

 est, one and forty-seven-huudredths by one inch. 



TRACHEMYS ELEGANS Wied ; Ag. 



The shell measured six and tweuty-five-hundredths by 

 five inches. The free portion of the longest claw was five- 

 eighths inches long. 



