150 CRETACEOUS AND TERTIARY FISH. 



Genus LEPISOSTEUS Lacepede. 



Lepisosteus Lacepede, Hist. Nat. Poiss., V, 1803, p. 330. Type Lepisosteus 



gavial Lacepede, first species, restricted by Jordan and Gilbert, Proc. 



Acad. Nat. Sci. Phila., 1877, p. 84. 

 Lepidosteus, auct. 

 Psallisostonus Walbaum, Pet. Arted. Gen. Pise, III, 1792, p. Type (no 



species given, except "Esocis species L.") Bsex osseus Linnaeus, affixed 



by Fowler, Proc. Acad. Nat. Sci. Phila., 1906, p. 81. (Name inad- 

 missible as only a reprint.) 

 Cylindrosteus Rafinesque, Ich. Ohien., 1820, p. 72. Type Lepisosteus platos- 



tomus Rafinesque, first species, restricted by . Jordan and Gilbert, 1. c, 



p. 87. 

 Atractosteus Rafinesque, 1. c. Type Lepisosteus ferox Rafinesque, first 



species, restricted by Jordan and Gilbert, 1. c. 

 Sarchirus Rafinesque, Journ. Acad. Nat. Sci. Phila., I, pt. 2, 1818, p. 418. 



Type Sarchirus vittatus Rafinesque, monotype. 

 Pneumatosteus Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869, p. 242. 



Type Pneumatosteus nahunticus Cope, monotype. 

 Clastes Cope, Rep. U. S. Geol. Surv. Terr., 1872 (1873), P- 633. Type 



Clastes cycliferus Cope, second species, restricted by Woodward, Cat- 



Foss. Fishes, III, 1895, p. 445. 

 Trichiurides Winkler, Arch. Mus. Teyler, IV, 1876, p. 31. Type Trichiurides 



sagittidens Winkler, monotypic. 



Characters included in those of the family. 

 Lepisosteus knieskerni sp. nov. 



Detached scale of lateral line unevenly rhomboid in contour of 

 enameled surface, both upper and lower anterior edges slightly 

 concave and upper posterior side longest. Enameled surface 

 with number of minute pores, and median transverse short exca- 

 vation (evidently a pore of lateral line) about first three-sevenths 



Fig. 92. — Lepisosteus knieskerni Fowler. (Type.) 



in length of scale. This pore opens on under side of scale in a pore 

 placed about last third in its length, and continued back hori- 

 zontally as rather deep groove. Inner or lower surface of scale 

 rough, not enameled, with short hook-like process at upper angle.. 

 Length about 17 mm. 



