1877. | 179 (Cope, 
contracted at the middle, and 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 apicalis, 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 
gentiy 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. 
Pipe went nO CraNMUMOs 25 csc <cleld slclastele ed atels aia 2/ahw cle eiorae 102 
Widtht ofseramitinmabe him aye). <1 eetere etait sietele =>) elele/ay- fel .050 
enethy ote premaxilllany, DOME.) o/e\eistsielateleiceiel teleieieieielele .015 
Depth of the dentary..... apd acse eet. cle adeters saeco oDede .009 
Men eT Ote Palate WOME) -/.:elerels coin siete tol o\e «)eletelelonvoe = .052 
Width ** $s EIN SARIS, oie ots Sie Cate oO eee 010 
4 S<VOMEeTINe Gentabe PALL. sox. lela tole clots eile slel= .010 
longitudinal. ....... -005 
Diameter of a cervical vertebra ~ transverse.........- -009 
MEM CE Sabon cabooe 007 
ANOGMIUS EVOLUTUS Cope. 
This fish is represented by an entire left mandibular ramus. As corres- 
ponding parts are preserved in the typical specimens of A. awratus 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 
