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Show 434 DR. J. E. ORAY ON THE BRADYPODIDA. [May 2, near the internal nostrils, in the other the groove is narrow and the opening of the internal nostrils much more constricted ; but one of the skulls with the arched forehead (1510 e), received from Capt. Kellett, has the grooves of the pterygoids much wider than in the others, and rather contracted instead of dilated in front at the opening of the nostrils. a. Crown flattened, broad. Brady pus didactylus, Blainville's Osteog. t. iii. fig. (skull, adult and young). Skull (736a), adult. Columbia. Skull (7366), young. B. didactylus, Rapp, Edentata, t. iii. fig. 2, 3. Skull with the nose very deformed. Cholcepus hoffmanni. Veragua. b. Crown arched longitudinally and transversely. Skull adult (736d). Ecuador. Skull adult (1510e). Cholcepus hoffmanni, Capt. Kellett, is peculiar for having the nasal bone prominent beyond the edge of the nose and thoroughly anchylosed to the other bones. c. Skull very young. Nose only preserved, narrower than the rest. No. 736 c. The skull from the very adult skeleton (15106) appears to belong to this variety ; but the flatness of the hinder part of the crown renders it intermediate between the two. It has a very broad canal between the pterygoids, like the skeleton (1510e); and the pterygoids of these two skulls are not nearly so vesicular as in the other specimens. d. There are three skulls of young animals, one received from Dr. Peters from Costa Rica as Cholcepus hoffmanni, and two received from Costa Rica by Mr. Salvin. They are all peculiar for having the scars of the temporal occupying the whole of the hinder part of the skull, and only separated from each other by a narrow ridge. The oldest of the three (1510 e) has a rounded convex forehead and a narrow groove between the pterygoids, which are dilated in front, and a small distinct nasal. The next in age (1510a), received from Dr. Peters, has a broad more flattened forehead; and the smaller one, from Mr. Salvin (1510 a*), has a still more flattened forehead; these two have a very broad groove between the pterygoids, narrowed in front; in fact the skulls of the species of Cholcepus are exceedingly variable in external characters in specimens from the same locality. Tribe II. BRADYPODINA. Hands and feet three-clawed. Skull oblong. Front end of the lower jaw truncated, without any or only a very short anterior spoonlike lobe. Intermaxillaries rhombic, rudimentary, not united to the front of the maxilla, generally lost in maceration. The front upper grinders small, cylindrical, truncated, not nearly so large as the others. The second upper grinder largest, generally gradually smaller backwards. The front lower grinder broad, "compressed, |
