1874.] DR. MURIE ON FREGILDPUS VARIUS. 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 : — 



Wing. 



Leg 



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. Meta- 

 carpal 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, 



