. Catalogue of the fossil birds in the British Museum (Natural History). ALCIDiE. 193 posterior bonier of the distal extremity. The contour of this specimen accords very closely with that of Colymbus (compare Milne-Edwards, ' Oiseaux Fossiles de la France,' pi. xlviii. figs. 4-5), exhibiting the same curvature of the head, with a long articular surface for the furcula, the same great expansion of the distal extremity, on which the broken surface for the attachment of the process on the posterior border is distinctly visible. The surface for articulation is of the narrow form, with the large up
. Catalogue of the fossil birds in the British Museum (Natural History). ALCIDiE. 193 posterior bonier of the distal extremity. The contour of this specimen accords very closely with that of Colymbus (compare Milne-Edwards, ' Oiseaux Fossiles de la France,' pi. xlviii. figs. 4-5), exhibiting the same curvature of the head, with a long articular surface for the furcula, the same great expansion of the distal extremity, on which the broken surface for the attachment of the process on the posterior border is distinctly visible. The surface for articulation is of the narrow form, with the large up- ward extension on the inner aspect of the bone character- istic of the family. Hastings Collection. Puixhased, ISoo. Fi- Colymboidcs cdujUcus.—Ventral aspect of the left coraeoid ; from the Upper Eoceue of ITordwcll. \. Letters as in fig. 23 (p. 84). 30330. The imperfect anterior portion of a sternum probably refer- able to this species; from HordwcU. The left coracoidal groove fits the preceding specimen. In the presence of a deep concavity in the middle line between the coracoidal grooves, the inner surface of this specimen agrees with the sternum of Cohjmhus, to which it approximates in the slight development of the episternal process. Hastings Collection. Family The tarso-mctatarsus is not compressed laterally, and has a slightly developed talon, usually with three open grooves, but the innermost of which may form a closed tube {Alca tarda). The cncmial crest of the tibia extends only a short distance above the o. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). Department of Geology. [Birds]; Lydekker, Richard, 1848-1915. London
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