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Show 1874.] DR. M U R I E O N FREGILUPUS VARIUS. 481 rounded. The rostrum is sharply upturned, and terminally widely forked; the costal processes are both broad and high. Within, the sternum is shallow and widish. There is a large inflected interclavicle ; and whilst the narrowly U-shaped furcular limbs throughout are slender, their upper ends are outspread. The shaft of the coracoid is rounded, long, and not thick, its lower sternal end broadening gradually with an outer, thinned, sharp margin; its scapular extremity with a moderate expansion. The scapula is sabre-shaped and of medium width. On each side there are only seven vertebral ribs extant in the specimen; but, from appearances, I surmise that there has been an additional riblet anteriorly. The five front ribs have recurrent processes ; in the hindermost two there are none. The last rib of all has a delicate spinal end ; the first does not reach the sternum ; neither does the last, though it is fastened to the sixth. Thus there are only five osseous sternal ribs which articulate with the sterno-costal process, and as many which expand at their upper vertebral angles. In form the thoracic cavity is high behind, the reverse in front, and from side narrow and subcompressed. Pelvis and Spine.-The pelvis is narrow in front, moderately broad in the middle (postiliac region), and wide at the lower (pubo-ischial) processes. The prae- and postacetabular lengths are subequal, advantage, if any, being in favour of the latter. The anterior iliac blades are considerably deflected ; but the rear of the pelvis dorsally is full and convexly depressed. The descending ischial plates have a rather perpendicular set, and at the ischiatic foramen the postilium overhangs considerably. The tenuous pubic rods broaden terminally, and are in apposition with and extend further than the tuberosity of the ischium. The renal excavations are each deeply scooped, and exhibit only a trace of transverse partition. In the neck there are 11 vertebrae, or 12 if that possibly carrying a riblet be included; in the back 7 or 8 with that anchy-losed to the sacrum ; of sacral 7 or 8 ; and of free caudals 8. Expressed in formula : C. 11 (12?), DL. 7 (8?), S. 7 (8?), Cd. 8,= 34 (35 ?). Neural spines obtain in 2nd, 3rd, 4th, and 5th cervicals. 1st to 4th show single median haemal spines, absent in those that follow, but reappearing in the 11th. The intermediate cervicals possess inflected plates, which defend the carotid artery. Recurrent spicules commence on the 3rd, and increase in length and strength almost to the hindmost neck-vertebrae. The 1st and 2nd dorsals have barely appreciable neurapophyses ; those behind have them well developed. Only three or four of the foremost dorsals have inferior mesial spines. Sacrum with a solid columnar body ; ragged-edged perforations mark intertransverse vertebral divisions. The six anterior free caudals are tolerably uniform, the penultimate and pygostyle are more adnate, though not anchylosed. Cranio-lingual formation.-The bill, i. e. premaxillary region to the rear segment or orbitocranium, is nearly as 4 is to 3 in length. The skull generally, both from above and in profile, has a long, narrow wedge-form. The brain-area is only very moderately high, being |