474 REPORT OF NATIONAL MUSEUM, 1898. 



terior border abruptly emarginate to receive an anterior process of the 

 vomers. The latter are very elongate, in contact for the anterior two- 

 thirds of their length, but widely divaricating posteriorly ; thin inferior 

 surface convex in transverse sections; narial fossa? very large, the ante- 

 rior extremity much narrowed. Palatine bones wider than long, the 

 vomerine and palatine limbs subequal; palatine foramen very small, 

 longitudinal; pterygoid narrowed anterior to basipterygoid processes, 

 the anterior portion expanding gradually from behind; no pterygoid 

 teeth; ectopterygoid ilat; nasals narrow, encroached on each side 

 of the middle by the elongate nostrils and with very slight contact 

 with the prefrontals; frontals distinct from each other, wide; inferior 

 plates oblique, in contact below, thus inclosing the olfactory lobes; 

 parietal undivided, expanded laterally and without pineal foramen; 

 supraoccipital scarcely in contact with parietal, which overhangs it; 

 parietoquadrate arch very distinct, wide, its distal portion in front 

 consisting of the large paroccipital; exoccipitals suturally distinct from 

 both supra- ana basi-occipital; facial ])lateof maxillary a ery large; pre- 

 frontals elongate, extending over the orbit to meet the postfrontals ; 

 lachrymal small, scarcely touching prefrontal, bounding the large lach- 

 rymal foramen anteriorly and in contact with jugal. The latter is an L- 

 shaped bone, the subvertical limb reaching thei)ostfrontal; postfrontal 

 rather large, irregularly subtriangular; no postorhital ; supratemporal a 

 vertically triangular rudiment at the anterior base of the paroccipital; 

 quadrate with one, an extero posterior, conch; presphenoid cartilagi- 

 nous; sphenoid and basioccipital distinct, not expanded laterally, the 

 lateral descending tuberosities of the latter well defined; a large con- 

 dylar foramen divided by an internal partition ; occipital condyle dis- 

 tinctly tripartite; the pterygoid originates opposite the basipterygoids 

 and touches both the petrosal and parietal, the latter sending down a 

 slight lateral ridge. The subforami'nal portion of the petrosal is not 

 as long as the supraforaminal part and has a mere trace of a groove 

 on its external side. 



In the mandibile the groove of Meckel's cartilage is open throughout. 

 The coronoid bone is extended in both directions on the inner side 

 and anteriorly only on the external side. The dentary is short, not 

 extending behind the anterior suture of the coronoid; spleuial rather 

 elevated, extending anterior to splenial foramen ; surangular and artic- 

 ular distinct; angle narrowed, directed gently inward. 



The hyoid apparatus is simple. No second ceratobrauchials ; the first 

 simple osseous. Ceratohyal much curved, returning posteriorly on 

 itself anteriorly to meet the extremity of the rather short hypohyal. 

 Basihyal not wide. 



There are only two ossified intercentra of the cervical vertebr*, and 

 there are no hypapophyses. Atlas and two cervicals only without ribs. 

 No zygosphene; prezygaspophysial surface simple. The two sacral 

 centra and diapophyses are not coossified. Caudal centra not seg- 



