1S92.1 -1^' rcope. 



is double. Essentially, it agrees with Aramus in the general form of its 

 hypotarsus and in the direction of its lateral muscular ridges. In other 

 particulars it exhibited both some minor differences and agreements with 

 the corresponding bone in the skeletons of Crex and Rallus. Upon the 

 whole the specimen would appear to have belonged to some large rail- 

 like wader, now extinct. 



The name of the genus I create to contain this form is composed of the 

 two Greek words, xpi^, a crake, and stdo^, resemblance. Its specific 

 name is given it in honor of Prof. Henry F. Osborn, of Columbia College, 

 New York, in recognition of his excellent work in paleontology for a 

 number of years past. 



The specimen was collected by Mr. W. T. Cummins, and is at present 

 in the possession of Prof. E. D. Cope, to whom the writer is indebted for 

 the honor of having been permitted to describe it. — R. W. ShufekU. 



Testudo turgida sp. nov. 



This species is represented by the greater part of a chelonite of about 

 the size of the Xerobates agassizii of Arizona. It is remarkable for the 

 remarkable depth of the dermal sutures and sculpture lines, and for the 

 swollen character of the interspaces which separate both. The general 

 shape is a short, wide oval, with steep to vertical margins. 



The plastron is widely emarginate posteriorly, and the anal- femoral 

 dermal sutures form a deep notch in the border. Tlie anal scuta are 

 oblique rhomboids, with equal and nearly parallel sides. The median 

 longitudinal dermal suture is deep and wide, cutting half through the 

 thickness of the plastron. It sends off a branch on each side bounding 

 the gular plates in front. The part of the plastron enclosed in the latter 

 forms two flattened cones appressed together, whose vertical diameter 

 exceeds the transverse, and whose subconic apices are separated by a deep 

 notch. The interclavicular bone is very large and is wide diamond- 

 shaped, the anterior angle being larger than the posterior. The transverse 

 humeropectoral suture is very deep, and is similar to the median longi- 

 tudinal. The borders of tlie anterior lobe are strongly convex, with a 

 chord only twice as long as the lateral border of the gular plates. 



The nuchal bone has a strongly concave-emarginate border. On the 

 posterior vertebral bones is a seat-like concavity, which is surrounded by 

 a ridge which forms the greater part of a circle. The costal bones are 

 unequally divided by the costal dermal sutures, which are very deep. 

 Each costal scutum is divided into two areas, one of which is marked with 

 ribs parallel to the vertebral axis at one extremity and a seat-shaped plane 

 with a bordering ridge at the other, which is in some of the costals smaller 

 and more swollen. The other half or part of the costal scutal area is 

 swollen in the longitudinal direction, but not for its entire length. The 

 marginal bones are massive and have a subacute border between the 

 bridge and the median points. Tliey are much deeper than long, and are 

 deeply divided by the sutures which separate the dermal marginals. These 



