337 



FIG. 444. Echmatemys naomi. Upper sur- 

 face of epiplastral lip of type. X $. 



nessiana. Furthermore, the free borders of the nuchal and first pair of peripherals are acute, 

 while those of E. shaughnessiana are rounded. In the type of E. shaughnessiana the humero- 

 pectoral sulcus passes behind the entoplastron; in E. naomi, across it. 



In E. septaria the epiplastral lip is more contracted, the epiplastrals are very thick at the 

 sides of the lip, and the anterior lobe expands in front of the base. 



In E. ocyrrhoe the vertebral scutes are narrower, the anterior marginal scutes extend up 

 farther on the peripherals, the costal plates have their opposite ends alternately wide and 



narrow, and the horn-covered surface of the upper 

 side of the posterior lobe is relatively much nar- 

 rower. E. arethusa has narrow vertebral scutes 

 and a contracted epiplastral lip. 



E. cegle resembles E. naomi in respect to the 

 neural bones and the form of the vertebral scutes. 

 The sulci of the carapace are not in deep grooves. 

 ,The lateral peripherals of E. naomi rise much 

 higher above the margin of the carapace than 

 those of E. regie, the fifth of the former rising 46 

 mm., in E. tegle only 34 mm. On this periph- 

 eral of E. naomi the costo-marginal sulcus runs 

 15 mm. below the upper border of the bone; in E. 

 cegle only 9 mm. below. The axillary scutes of 

 E. naomi are more strongly developt than in E. cegle, reaching backward and widely joining 

 the fifth marginals; while in E. tegle they lack much of reaching the fifth marginals. On the 

 other hand, the inguinal scutes of E. cegle extend forward to the sixth marginals, while 

 those of E. naomi do not reach the marginals just named. The epiplastral lip is quite differ- 

 ent in the two species, and the anterior plastral lobe of E. cEgle is relatively wider. The 

 neurals of E. naomi are considerably broader than those of E. cegle. 

 Dedicated to one of the world's noble women (Ruth i-iv). 



Echmatemys pusilla sp. nov. 



Figs. 445. 446. 

 Emys wyomingensis, LEIDY, Contrib. Ext. Vert. Fauna West. Terrs., 1873, p. 148, No. 13. 



This name is bestowed on a small turtle which was obtained by the writer in 1903 at 

 Grizzly Buttes, Wyoming. The number of the specimen in the American Museum is 5992. 

 The level is that known as B. The type specimen affords the greater part of both carapace 

 and plastron. The shell gives evidences of having been immature. The total length of the 

 carapace in a straight line appears to have been close to 125 mm. The upper shell (fig. 446) 

 was apparently quite convex. 



The nuchal bone has a length of 24 mm.; a width of 19 mm. in front and an extreme width 



of 28 mm. The free border is acute. 

 The greatest thickness is 4 mm.; the 

 border for articulation with the first 

 peripheral is slightlyless than this. The 

 neurals are broad. Their dimensions 

 are shown in the table; also those of 

 the vertebral scutes. 



The second neural is octagonal. 

 The next two are hexagonal, with the 

 postero-lateral angles truncated. From 

 the forms of the contiguous costals it 

 appears that the fifth neural had the same form as the fourth, that the sixth was four-sided, 

 the seventh and the eighth hexagonal, with the antero-lateral angles truncated. 



All the costals are represented in whole or part. They are thin, about 2 mm. distally, 

 thickening proximally to about 3.5 mm. On the visceral surface of those of the first 

 pair the axillary buttresses ascend a considerable distance above the lower borders. At the 

 22 



