Jiaksh.] ANCHISAUEID^;. 1 49 



THE POKE LIMBS. 



The scapular arch is well preserved. The scapula, shown in PI. II, 

 fig, 2, s, is very long, with its upper end obliquely truncated. The 

 coracoid is unusually small and imperforate. The sternum was of car- 

 tilage, some of which is preserved. The humerus is of the same 

 length as the scapula and its shaft is very hollow. The radius and 

 ulna also are both hollo v. and are nearly equal in size. 



There is but one carpal bone ossified in this specimen, aud this is 

 below the ulna. There were five digits in the mauus, but only three 

 of functional importance, the first, second, and third, all armed with 

 sharp claws. The fifth was quite rudimentary. The fore foot of the 

 type species of Anchisaurus is shown, one-half natural size, on PI. Ill, 

 fig. 5. 



THE HIND LIMBS. 



The pelvic bones are shown in fig. 3 of PI. II. The ilium is small, 

 with a slender preacetabular process. The ischia are elongated, and 

 their distal ends are slender and not expanded at the extremity. The 

 pubes are also long, imperforate, and not coossified with each other. 

 The anterior part is a plate of moderate width. 



The femur is much curved and longer than the tibia. The latter is 

 nearly straight, with a narrow shaft. The fibula when in position was 

 not close to the tibia, but curved outward from it. All these bones 

 have very thin walls. The astragalus is small, closely applied to the 

 tibia, and has no ascending process. The calcaneum is of moderate 

 size and free. There are only two tarsal bones in the second row. 



The hind foot had four functional digits, all provided with claws. 

 The fifth was represented only by a rudiment of the metatarsal. The 

 first digit was so much shorter than either the second, third, or fourth, 

 that this foot would have made a three-toed track very much like the 

 supposed bird-tracks of the Connecticut River sandstone. 



ANCHISAURUS SOLUS. 



A fortunate discovery has recently brought to light almost the 

 entire skeleton of still another diminutive dinosaur, which may be 

 referred to Anchisaurus, but clearly belongs to a distinct species. It 

 was found in nearly the same horizon as the remains above described, 

 and in the immediate vicinity, so there can be little doubt that it was 

 a contemporary. The skeleton is embedded in a very coarse matrix, so 

 difficult to remove that the investigation is only in part completed. 

 The portions uncovered show the animal to have beeu about 3 feet in 

 length, and of very delicate proportions. The bones of the skeleton 

 are nearly all extremely light and hollow, but most of them are in a fair 

 state of preservation. 



The skull, so far as it can now be observed, resembles the one just 

 described. The teeth are numerous, and inclined forward. The orbit 



