474 PROCEEDINGS OF THE NATIONAL MUfiEUM. vol.xxi. 



Third epibranchials {ehr) broadly join large siiix'iior pharyngo- 

 braiicliials. 



Fourth epibranchials closely join third along u])|)er lialf, but very 

 slightly, if at all, joined to large superior pharyngobrauchials. 



pp:lvic oirdle. 

 (Plate XXXV, iig. 7.; 



Pelvic girdle {pa) composed of two wide, thin, nearly vertical i)lates, 

 braced through their middle by a long ridge; each sending a long 

 process backward just under skin of belly. 



Ol'.BITAI.S AND NASALS. 



(Plate XXXVI, fig. 10.) 



Orbitals forming a long narrow chain of bones some distance below 

 eye; i)reorbital {por) attaching to near lower end of palatine; at its 

 center is a short hooked spine; suborbitals {sor) five in number. 



Nasals [na] present; rather small; posterior in position owing to 

 produced ethmoid and vomer. 



VERTEBRAL COLUMN. 



(Plate XXXVIII, figs. 14-16.) 



Vertebral formula: IS+lT + hypural- 31. 



Body of vertebra; round and symmetrical, but very deeply pitted; 

 anteriorly much compressed and higher than long; no inferior zygo- 

 I)ophyses; posterior zygopophyses only on anterior vertebra;; anterior 

 zygopophyses well develo[)ed for whole length of vertebral column. 



Atlas higher than long; centrum deeply concave on anterior surface, 

 deeply convex* on posterior; nenral proces.ses not connected above; 

 flaring outward anteriorly and joined rather firndy to ridges on each 

 side of foramen magnum; lateral to condyle for articulation with exoc- 

 cipitals a notch is developed lor reception of a corresponding process 

 on exoccipitals. 



No parapophyses on first sev^en vertebra*; well developed on suc- 

 ceeding abdominal vertebra;; those of opposite sides of each vertebra 

 ankylosed at their distal ends, as well as those of different vertebrse 

 being joined together by sutures forming a sharp ridge, to the very 

 edge of which ribs are joined, thus bringing bases of opposing ribs 

 close together. 



Hicmal processes of the fourteenth, fifteenth, and sixteenth vertebrte 

 form a tube which surrounds the upper end of large interhajmal spine. 



Neural spines pointing irregularly on account of interneurals not 

 coinciding with them, the latter being less in number. 



Anterior zygopophyses developed upward, forming a sheath for spinal 

 cord. 



