Dr. J. Murie on the Genus Colius. 279 



slight ossification of the nasal septum, with extensive naso-pala- 

 tine space. Vomer short, acuminate anteriorly, and without 

 cleft posteriorly. No basipterygoid processes. Absence of 

 crochet or infralachrymal bone. Quadrate with a short orbital 

 process; articular knuckles subequal in depth, the inner one 

 laterally compressed and obliquely set. Mandibular rami deli- 

 cate, deep ; a large dentary space ; internal angular process 

 well developed ; a pronounced postinferior angle. Sternum 4- 

 notched; xiphoids very long and slender. Keel and pectoral 

 plates shallow, the latter occasionally denticulate. Four rib- 

 facets. Eostrum indented, but not deeply cleft. A large inter- 

 clavicle present; and prsecoracoid moderately wide. Pelvic 

 postacetabular area wide and square ; prseacetabular without 

 special median contraction; the iliac margins do not form 

 spinal bridges. Ilio-ischial junction without special outward 

 shelving ; ischial tuberosity lengthened. Tarso-metatarse long, 

 the calcaneal process pierced by one foramen. All four toes 

 turned forwards, and furnished with acute slender claws. Tongue 

 flat, cartilaginous, with horny papillae. A simple inferior laryn- 

 geal muscle. Stems of the inferior feather tract sparse, dilated 

 on all sides, and no diverging outer branch. 



DESCRIPTION OF PLATE X. 



The skeleton, minus the ribs and some of the vertebrae, of the Bejook 

 Colitis (JRhabdocolius, Bp.) leiicotis, Rtipp. The bones are di-awn as nearly 

 as possible of their natui-al dimensions, excepting figs. 7, 8, 26, and 27, 

 which are enlai'ged to double their size. 



Fig. 1. Upper cranial surface. 



Fig. 2, The lower suiface of the skull. 



Fig. 3. Profile of the cranium. 



Fig. 4. The lower jaw or mandible in side view. 



Fig. 5. Upper or oral sui'face of the same. 



Fig. 6. Occipital surface of skull without the mandible. 



Fig. 7. The quadrate or articular bone on its outside and anterior aspect. 



Fig. 8, The same bone of the right side, from below. Each twice nat. size. 



The following lettering applies throughout to the corresponding parts 

 of the skull in the above figures : — 



pynx, prsemaxilla ; n, nasal ; I, lachrymal ; p, palatine ; mxpy maxillo- 

 palatine ; vo, vomer ? ; po, postfrontal process ; z, zj'gomatic process ; pt, 

 pterygoid ; ju, jugal ; q, quadrate ; fm, foramen magnum ; i n, internal 



