NO. 1186. BEL A TIONSHIP OF DINOLESTES LE WINI—STARKS. 117 



basispheuoid with, a descendiug process; myodome present with a 

 small pore to the exterior posteriorly; no suborbital shelf; vertebrae 

 27; parapophyses present on all abdominal vertebnie except first 3; 

 scales cycloid; maxillaries, cheeks, opercles, and lower jaw with scales; 

 lateral line straight, ranning well out on base of caudal, scales along 

 its course systematically crowded; base of anal, soft dorsal, and caudal 

 with small scales; anal with 2 spines and about 25 rays; dorsals remote, 

 the first of about 5 slender spines, the second with 1 spine and about 

 18 rays; ventrals with 1 spine aud 5 rays each; inters pinous bones not 

 extending between vertebral spines. 



OSTEOLOGY. 



Cranium, as viewed from above, rather elongate and narrow. Inter- 

 orbital region a flattish area with the sides nearly parallel the greater 

 part of its length, occupying at least a third of length of cranium. 

 Preorbital region elongate, not tapering till near end, occupying 

 another third of length of cranium. Region surrounding foramen 

 magnum slightly produced. Lateral view of cranium taj)ering rather 

 regularly to vomer. 



Supraoccipital interposed between exoccipitals nearly to their poste- 

 rior ends; its crest developed superiorly and posteriorly, scarcely 

 extending past exoccipitals iDosteriorly. 



Exoccipitals broadly meeting above basioccii^ital, entirely surround- 

 ing foramen magnum. 



Parietals widely separated by supraoccipital, not extending over 

 epiotics. 



Bpiotics with scarcely any process. 



Prootics, opisthotics, sphenotics, and pterotics typical; that is, 

 Percoid-like. 



Alispheuoids widely separated. The anterior opening into brain 

 case large. 



Basispheuoid present; a foramen between it and basis crauii. A 

 slender process descending from it and attached to parasphenoid, 



Myodome present; opening to the exterior at its posterior end 

 through an extremely small foramen. 



Parasphenoid spreading out wide ])osteriorly. 



Vomer bearing sharp short teeth in a single row around its anterior 

 edges. Teeth becoming smaller anteriorly. 



Prefrontals large and rather elongate, the olfactory foramen scarcely 

 behind middle. 



Ethmoid entirely superior to prefrontals aud vomer, widely overly- 

 ing them aud extending to edge of rostrum, A raised area along its 

 middle. 



Nasals thin elongate rods of bone attached by their sides to ethmoid 

 for nearly their whole length; their length over a fourth that of 

 cranium. 



Preorbital longer than wide; its outline triangular. 



