. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . ee pairs of cervicals and six rows of dorsals. My type specimen,brought from the Ogobai by DuChaillu possesses six rows of dorsals, and only four cervicals, thus combining thecharacters of the two. Gray, however, who has seen Murrays type, says there are but four rows of dorsal plates;in the Ogobai specimen one row has but five, and in three others the two outer are nearly united ; so I am disposedto think that no great importance is to be attached to this character. Murrays specimen has the relatively enlargedbrain cavi
. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . ee pairs of cervicals and six rows of dorsals. My type specimen,brought from the Ogobai by DuChaillu possesses six rows of dorsals, and only four cervicals, thus combining thecharacters of the two. Gray, however, who has seen Murrays type, says there are but four rows of dorsal plates;in the Ogobai specimen one row has but five, and in three others the two outer are nearly united ; so I am disposedto think that no great importance is to be attached to this character. Murrays specimen has the relatively enlargedbrain cavity of a young animal elongating the table of the cranium ; Lilljeborgs, which is adult, maintains thischaracter more than our specimens do. Gray gives a figure of the cranium of the adult, which coincides with twocrania in our Museum, one of the above mentioned specimen, while both agree in the proportions of the muzzle withthat described by Lilljeborg. The last, however, differs from all these in having the table of the cranium but little AND AVES OF NORTH AMERICA. 85. Fig. 26. wider than long ; in our specimens and Grays figure it is nearly twice as wide as long. It also appears that thenasal bones do not entirely divide the nasal meatus, which they do in the three specimens under observation. On thewhole I am disposed to think that these forms belong to one rather variable species. It is true that Gray says hindfoot fringed, but this I am inclined to think must be true to a very limited extent. There is only a keel in ourspecimen, and Lilljeborg says there is no fringe in his. OSTEOLAEMUS TETRASPES, Cope. Proceed. Ac. N. Sci., Phila., 1860, 550. Crocodilus palpebrosus, var. 2, Cuvier. Oss. Foss. iii., t. 2 f. 6 (part).Crocodilus trigonatus (part) Curvier. Oss. Foss. iii., 65. African Black Crocodile, Gray. Eept. BritishAssoc, 1862, Zool. Section, 107. Osteolaemus tetraspes, Cope. Proc. Acad. , Phila., xii., 550. Crocodilus frontatus, Proc. , 1862, pp. 1
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