Cope.] ^^^ [April 1, 



which is relatively short and wide in the G. decipieas (see Agassiz, in the 

 Poissons de la VieuxGres Rouge, and Zittel, HandbuchderPaleontologie), 



MM. 



Length of supraclavicle 35 



Width just above condyle 16 



Associated and in contact with these pieces are two acuminate oval 

 bones which may be opercula. Each is pierced by a groove. They dis- 

 play the inferior side, which is smooth. 



Megalichthys m.^cropomus, sp. nov. 



Establishedon the greater part of an individual from the Carbonic system 

 of Kansas. With the exception of a short interval just behind the head, 

 the specimen is complete as to its length ; the pectoral and ventral fins are 

 damaged, and the extremity of the anal is broken ofi. The scales of one 

 side of the body only are visible in the present state of the specimen, and 

 a good many of those of the abdominal region are lost. 



The general characters may be enumerated as follows : The form is 

 slender. The scales are large and rhombic, with rounded extremities. 

 The supratemporal (cheek) bones and opercula are very large, and are 

 much extended posteriorly. The enamel is present on the superior aspect 

 of the skull in small and irregular patches only, but it covers the rest of 

 the external surfaces. It is everywhere closely and minutely impressed- 

 punctate. The bones of the skull are thin and light. 



The elements of the skull are distinguishable for the most part, the 

 sutures being obliterated on the nasal region. The pterotics (squamosals 

 Traquair) are longer than the postfrontals, and the parietals are longer 

 than the frontals. The supratemporals (cheek-bones Traqu.) are very 

 large, extending posterior to the posterior border of the parietals. The 

 intercalaria are large (supratemporals Traqu.). The opercula are very 

 large, and in this specimen they are shoved upwards so as to overlap at 

 the median line. Their length enters the total length of the skull, three 

 and a half times, and is a little greater than that of the parietal bones. 

 Their superior margin is leveled off from a low longitudinal thickening, 

 from which some low wrinkles radiate downwards. Enamel is present on the 

 superior surface of the skull, on the border of the frontal bone posterior to 

 the orbit, and on the anterior part of the postfrontal bone. There are 

 grains of enamel scattered on the parietals. On the supratemporals there 

 are closely placed concentric interrupted lines on the superior part, and 

 irregular patches of larger size on the inferior part. There are large 

 patches of enamel on the opercula. The superior bones of the skull are 

 everywhere roughened with minute tuberosities, which fuse into trans- 

 verse ridges on each side of the sagittal suture. The maxillary bones are 

 displayed partly on the superior, partly on the inferior faces of the speci- 

 men. They are rather slender, and their distal extremities are broken oti. 



There is a short pyriform symphyseal, entirely enclosed by the mandib- 



