EMYDIDZ. 337 
nesstana. 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 £. naomz, 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. ocyrrhoé 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-coyered 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. egle 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 EF. egle, the fifth of the former rising 46 
mm., in E. egle 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. 
egle only g mm. below. The axillary scutes of 
E. naomi are more strongly developt than in E. «gle, reaching backward and widely joining 
the fifth marginals; while in FE. egle they lack much of reaching the fifth marginals. On the 
other hand, the inguinal scutes of E. egle extend forward to the sixth marginals, while 
those of E. naomi do not reach the marginals just named. The epiplastral lip 1s quite differ- 
ent in the two species, and the anterior plastral lobe of EF. egle is relatively wider. The 
neurals of E. naomi are considerably broader than those of EF. egle. 
Dedicated to one of the world’s noble women (Ruth ty). 
Fic. 444.—Echmatemys naomi. Upper sur- 
face of epiplastral lip of type. xs. 
Echmatemys pusilla sp. nov. 
Figs. 445, 446. 
Emys wyomingensts, Leipy, 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 
Nowell Lenethe |) Width: No. Tenet. ieee Bene peripheral is slightly less than this. The 
neurals are broad. Their dimensions 
are shown in the table; also those of 
Dimensions of neurals. Dimensions of vertebral scutes. 
1 14 1 I 25 30 
2 iW 12 2 26 30 the vertebral scutes. 
3 12.5 13 3 25 30 The second neural is octagonal. 
2h 24+ r ae 
2 ‘4 : 2 4 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 
