1877.] l«y [Cope. 



contracted at the middle, an<? are sculptured with fine longitudinal 

 grooves. 



The cranium is depressed, and was so in life. The form of the muzzle 

 is the extremity of an oval, at the apex of which are the two short pre- 

 maxillaries, while the sides are composed of the long maxillaries. The 

 top of the head is nearly smooth, marked only posteriorly by a few delicate 

 radiating grooves and dots. 



The inferior view displays the vomer, palatine, and maxillary bones with 

 their myriad teeth en brosse. Those of the maxillaries form a narrow 

 band, those of the premaxillaries a little wider one. The palatines are 

 long flat bones similar to those of the Stratodus apiealis, but of less elongate 

 proportions, and the teeth they bear are relatively smaller and not in 

 longitudinal rows as in that fish. The teeth of the median line of the pal- 

 ate form an elongate tongue-shaped patch, flat and acuminate in front, but 

 gently convex, and with lateral bevels more posteriorly. The teeth it 

 supports are very close together as on the palatine bones. The posterior 

 portion of this patch is broken away. The mandibular ramus is not deep 

 and the symphyseal surface is a rectangular truncation of the nearly par- 

 allel inferior and superior edges. The teeth are in many rows, the num- 

 ber diminishing posteriorly. The dentary is incurved to the symphysis. 

 The premaxillary bone is not smooth like the others of the cranium, but 

 is pitted anteriorly, and radiately ridged posteriorly. 



Measurements. M. 



Length of cranium 102 



"Width of cranium behind 050 



Length of premaxillary bone , 015 



Depth of the dentary 009 



Length of palatine bone 052 



Width " " " 010 



" " vomerine dentate patch 010 



( longitudinal 005 



Diameter of a cervical vertebra •< transverse 009 



(vertical 007 



Anogmitjs evoltjtus Cope. 



This fish is represented by an entire left mandibular ramus. As corres- 

 ponding parts are preserved in the typical specimens of A. aratus and A. 

 favirostris, comparison with these species is easy. 



The ramus is less curved than in either of the species mentioned, indica- 

 ting an elongate and wedge-shaped head. The symphysis is short ; deeper 

 than wide, and but little incurved. The ramus is much contracted verti- 

 cally at the glenoid cavity, which is deeply impressed and decurved on the 

 inner side, having thus a convex transverse section. The angle is re- 

 curved behind the glenoid cavity, and also produced for a short distance in 

 line with the inferior margin of the ramus, this portion being separated 

 by a sinus from the superior process. The form of the angle is then that 



