NO. 2137. Tiro NEW FOS^^JL TURTLES— GlLMOEIl. 643 



The total length is 253 mm. at the center. The posterior extremity 

 ends 25 mm. anterior to the border of the carapace. The anterior 

 end also falls within the border of the shell. The plastron at the 

 center is angularly concave but I am inclined to the opinion that 

 this has been brought about by postmortem causes. The anterior 

 lobe is short and narrow, much as in Baena callosa Hay, the length 

 being 63 mm.; the width at the base being 92 mm.; at the gular 

 sulsus 44 mm. The free borders of the anterior lobe in section are 

 rounded. The thickness is about 8 mm. 



The width of the bridge 122 mm. 



The posterior lobe is 72 mm. long; 120 mm. wide at the base; at 

 the femoro-anal sulsus 89 mm. Avide. The contours of the converg- 

 ing borders are well shown on plate 33. Immediately behind the in- 

 guinal notch the thickness is 15 mm.; near the posterior extremity 

 7 mm. The posterior end has a. subacute border that is only slightly 

 emarginated at the center. 



There are distinct gulars and intergulars. The humero-pectoral 

 sulsus crosses to the center about on the line joining the axillar}^ 

 notches. The intergulars meet on the median line a distance of 10 

 mm.; the gulars 12 mm. on the left side, 8 mm. on the right side; 

 humerals about 38 mm. ; pectorals 57 mm. ; the anals 48 mm. Tlic 

 course of the femoral-abdominal sulsus pursues a very irregular 

 course. The anal-femoral sulsus as in other species of Bacnii runs 

 outward then backward and then outward to the border. 



On the bridge there are four large inframarginals as shown on 

 plate 33, resembling somewhat those of B. hatcherl Hay in outline 

 and position. 



The ventral area of the marginals is much greater than in any 

 other species of the genus. 



As mentioned above, Baena hay I is distinguished at once from 

 all other species of the genus by the proportions of the carapace, it 

 being the only one known in which the width exceeds the breadth. 

 From B. inm'shi this species may be distinguished by having a sculp- 

 tured carapace, and the wider marginal areas on the ventral surface. 

 From B. hatcheri it differs in the contour of the shell, being short 

 and truncated at both ends, whereas B. hatcheri is relatively long, 

 with a somewhat pointed anterior end. The absence of supernu- 

 merary scutes lateral to the first vertebral also serves further to dis- 

 tinguish it from the latter species. 



ASPIDERETES LANCENSIS, new species. 



Type. — Cat. No. 6727, U.S.N.M., consists of a considerable portion 

 of the carapace, lacking a portion of the anterior border, the ninth 

 pair of costals, and the ends of the forward costals of the left side. 



