241 



lie one on the other, forming a tim-shaped body. The arches do not, at the 

 same time, become anchylosed. This structure is seen in the A. contractus 

 and in a second and smaller species. It finds a parallel in the caudal verte- 

 bi-jE of the genus Ischyrhiza of Leidy, from the greensand of the New 

 Jersey Cretaceous, where all the elements of this fan-shaped body, centra, 

 spines, etc., are coossifi.ed into a solid mass. This will define a family, and a 

 species having the same structure is common in the Miocene of Maryland. 

 In Anogmius, the sides of the centra, though lacking the large grooves of 

 other genera, are striate-grooved and reticulate. So are those of Ischyrhiza, 

 and both in this resemble the recent genus Esox. Add to this the fact that 

 the teeth oi Ischyrhiza are almost exactly like those of Esox, especially as to 

 their large-fissured fangs, and half-pleurodont insertion, some relationship to 

 the Esocidm may be predicated. I brought forward this suggestion as to the 

 affinities of Ischyrhiza in the preliminary monograph of the fossil fishes of 

 Kansas already quoted. 



Anog?nius contiactus was about the size of Ichthyodectes prognathus. The 

 second Anogmius is not more than one-third the size ; the caudal vertebrae 

 are more aggregated; and the neural spines, after leaning backward, are turned 

 upward. The specimen came from Lower Butte Creek; no parts of cranium 

 nor fins were found. The vertebrae originally described by me as pertaining 

 to Ichtliyodectes ctenodon belong either here or to Ischyrhiza ; they agree with 

 the latter in most respects, having the neurapophyses coossified with the cen- 

 trum. Tiiey are several times larger than those of A. contractus, and relatively 

 shorter, being about equal to those of Ischyrhiza mira, Leidy. 



I do not name these species, as they may belong to known genera, and 

 will be, in any case, better identified from cranial and fin remains. 



APSOPELIX, Cope. 



Established on the remains of a fish preserved on a block of clay. 

 It presents its ventral- aspect, and displays pectoral, ventral, and anal fins, 

 with the series of interneural spines to which the dorsal radii were articu- 

 lated. 



The scales are large and cycloid. They do not present a trace of radii, 

 but are marked with fine and close concentric grooves. These assume a 

 vertical direction on the exposed surface, and are there more irregular ; the 

 31 c 



