1 66 CRETACEOUS AND TERTIARY FISH. 



Formation and locality. Like the last f rom Monmouth County 

 (P. D. Knieskern) 7. Besides these, also another tooth showing- 

 several transverse rings below its middle, from "New Jersey" 

 (Burtt), and one from Vincentown [the Vincentown limesand 

 or the Manasquan marl, K.] in Burlington County (T. M. 

 Bryan). 



Order HAPLOMI. 



THE PIKE-UKE FISHES. 



Mouth with teeth. Post-temporal normally attached to cra- 

 nium. Parietals separated by supraoccipital. Symplectic pres- 

 ent. Opercular bones well developed. Mescoracoid wanting. 

 Coracoids normal. Hypocoracoid and hypercoracoid separate,, 

 with developed actinosts. Pharyngeals distinct, superior di- 

 rected forward, 3 or 4 in number, lower not falciform. No inter- 

 clavicles. Scapular arch joined to cranium by post-temporal. 

 Front vertebras unmodified. Air-vessel with distinct duct. Head 

 usually covered with cycloid scales, like on body. Fins with soft 

 rays. Dorsal low, mostly posterior, first ray occasionally stiff or 

 spine-like. No adipose fin. Pectoral placed low. Ventral ab- 

 dominal, rarely wanting. 



The fishes of this group are interesting as showing osteological 

 characters more in agreement with the Isospondyli, thus more 

 or less annectant with that order and the Acanthopteri. About six 

 families are known, comprising a number of mostly fresh-water 

 forms among existing fishes. The extinct forms have been re- 

 ferred entirely to the Bsocida and Poeciliidcu. 



Family ESOCID^. 



THE PIKES. 



Body elongate, not elevated, more or less compressed pos- 

 teriorly, broad anteriorly. Head long, snout prolonged and de- 

 pressed. Mouth large, its cleft forming about half length of 

 head. Upper jaw not protractile, most of its margin formed by 

 maxillaries, which are quite long and provided with a supple- 



