ANJ) AVES OF NORTH AMERICA. 



1G1 



Fig. 44. 



In. 



Liu. 



1 



7.8 





s. 



2 



0.5 



1 



2.5 



1 



4. 



but is a narrow pit with the margins much raised, and with a delioate carina along its middle; sides little rugose. 

 Length of fossa 1.5 inches; it; is parallel to the costal suture, at a distance of one inch, 



The speoimen from Birmingham aocompained that of the 

 Lytoloma angusta, and a lemur. As the proximal region of 

 the latter has no resemblance to that of any Cheloniid, I 

 suspect it belongs to the genus Taphrosphys, especially as 

 its size relates to that of this species. Its peculiarity con- 

 sists in the head being very much compressed, and the great tro- 

 chanter smaller and in the same plane. The lessor trochanter is 

 opposite the middle of the side of the head, its plane being parallel 

 willi that of the head, and connected with the hitter by a thick 

 cross-bridge ; it is Independent of the great trochanter, From 

 the outside the articular (ace of the head extends through an arc 

 of 190°. The distal extremity of the femur is considerably like 

 that of the Propleura sopita. The shank is narrow, and rap- 

 Idly expands to the condyles, and on the inner side into a 

 prominent rugose ridge. Condyle quite prominent below, the 

 Inner most so; shank next to them striate. Middle of shank lost. 



Length of axillary pit, 

 Greatest width, 

 Width on costal hone, 

 I (iameter head femur, 

 " oondyles do., 



Another specimen from Bamesboro exhibits an azygus bone in contact with the caudal marginal. It resembles 

 the oo.issilied proximal portions of the last pair of oostal hones, and bears with the penultimate the pit for attachment 

 of the crest of the ilium. It, appears, however, to he bounded by continuous suture posteriorly, and hence 

 is perhaps a, vertebra] hone. Its surface, like that of the plastron, is reticulately grooved. Pubic; suture grooved 

 medially directed inwards from lateral sternal margin, with high crest on outer edge, larger; margin of plastron 

 dilated, thin; marginal hones (hick, with heavy margin. 



The free margins of the xiphisternal thin out regularly to the flat Inferior surface. The edges of the marginal 

 bones are, on the oontrary, much thicker than the former, and than the same pieces in I', sulcatus, since the heavy 



portion is much nearer the margin. Sutures of the scutes arc apparent on these hones, and the anterior of the anal 

 scutum on the xiphisternal. The ischiadic sear is large and on an elevation; it is elevated on the outer margin and 

 deeply grooved in the noddle line. A sub-round elevation, with cross ridges, situated near the margin of the plastron 

 is the attachment of the pubis. 



In. Lin. 



Length of ischiadic suture. 2 1,5 



Width " » . 78 



Distance from nearest margin behind, 1 g.5 



The posterior vertebral has a peculiar form, and if correctly identified would indicate a short caudal and short- 

 ened ultimate oostal bone. It is thicker than any of the costal bones of other species, and has at its anterior part 

 below, a short longitudinal ridge;. Its sculpture is like that of the sternum, oomposed of Inosculating grooves 

 forming a coarse figure. Its anterior outline is transverse: autero-latera.l, oblique; latero-poslerior, straight longitudi- 

 nal not continuous with the former, but with a short margin at an obtuse angle, which proceeds from the antero- 

 lateral at a projecting right, angle. Posterior suture ooncave, to meet the posterior or caudal marginal. Latero- 



posterior margin bevelled below. Penultimate OOstal narrowing proximally, and supporting the longitudinal 

 elevation which bounds the iliac pit anteriorly. 



AMERI. PHILO. 800. — VOL. XIV. — 41 



