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Show 1874.] DR. M U R I E O N F R E G I L U P U S V A R I U S . 483 grooving. Towards the tip the borders are frayed, and, terminally, slightly forked. The edges of the posterior bifurcation are minutely crenate. Judging from the under aspect, convex and longitudinally furrowed, I believe the muscular structure to have been such that rapid protrusion and withdrawal of the tongue has obtained. With regard to the hyoid bones, each is lengthened and slender ; the uro-hyal is spatulate and tipped with cartilage. The trachea, widest above, tapers very gradually towards the syrinx. Its osseous rings are not simple and uniform, but composed of a series of half-rings, narrow at one extremity and broad at the other ; these dovetail with one another in front and behind. What remains of the lower larynx shows it to have been of moderate size. Limb-construction.-The right leg of this Cambridge skeleton has not been deprived of its integument, which latter, though dried and shrunken, nevertheless exemplifies its scaly character. The tibio-tarsal joint is here sparsely clothed with short feathering, which does not extend beyond the calcaneal elevation. Six scutes cover the tarsus anteriorly, the upper two being much narrower than the three between, which are remarkably long. The three topmost linear divisions are transverse in direction compared with the lowermost, which run obliquely outwards and downwards. Posteriorly the tarsus is smooth, or with a faint appearance of hexagonal scutel-lation, doubtfully produced by drying of the specimen. The dorsal scutella of the toes are numerous, short, and pronounced. The dermal tracery of the sole of the foot bears a minutely dotted or papillary character. Both wing- and leg-bones are comparatively strong ; but a striking preponderance results in the tibio-tarsal segments, as the subjoined measurements testify :- Meta- Mid Total Humerus. Ulna. carpus, phalanges, length. in. in. in. in. in. Wing 1-5 1-8 1*0 0-6 4'9 Tarso- Mid-toe Total Femur. Tibia, metatarse. phalanges, length. in. in. in. in. in. Leg 1-4 2-6 1-8 1-45 7'25 The humerus has a stout, straight, round shaft. Its expanded head has a very large double fossa or divided pneumatic entrance. The inferior inner condylar process is well marked and descends low ; a tubercle surmounts the external one. The ulnar shaft is almost devoid of elevations for quill-feathers, but is strong notwithstanding. The radius, on the contrary, is compressed and slender, and its head comes to a level with the outer articular facet of the ulna. Metacarpal and phalangeal pieces are tolerably solid. Femur characterized by its relative strength, but more particularly by the prominence of its outer inferior condyle and deep groove for tendon behind. As to the tibia, the production of its cnemial crest, |