1903] 



Hay, North American Cretaceous Fishes. 



57 



Ichthyodectes multidentatus Cope. 



Ichthyodectes multidentatus Cope (E. D.), Proc. Amer. Philos. Soc. 

 XII, 1872, pp. 339, 342; 5th Ann. Rep. U. S. Geol. Surv. Montana, 

 etc. 1872, p. 343; Btill. U. S. Geol. and Geog. Surv. Terrs. I, No. 

 2, 1874, p. 41; Vert. Cret. Form. West, 1875, pp. 212, 275, pi. 1, 

 figs. 6, 7. — Crook (A. R.), Palaeontogr. XXXIX, 1892, p. 123. 

 — Hay (O. p.), Amer. Jour. Sci. (4), VI, 1898, p. 227; Bibliog. 

 and Cat. Foss. Vert. N. A. 1902, p. 385. — Loomis (F. B.), 

 Palseontogr. XLVI, 1900, pp. 243, 245, text figs. 8, 9; pi. xxiii, 

 fig. 9. — Woodward (A. S.), Cat. Foss. Fishes, IV, 1901, p. 107. 



vert, 



This species was based on a premaxilla and a fragment of 

 the maxilla, and these parts were figured as cited above. 

 The type now bears No. 2186 of the American Museum of 

 Natural History. Afterward a more complete specimen was 

 secured and described. This is now No. 1743 of this Museum 

 and is represented in Figure 42. The identification of this 

 with the type is doubtless correct. Only a part of a single 

 tooth of the type re- 

 mains, but this shows 

 the presence of the 

 ridges and furrows 

 which are so distinctly 

 seen in Cope's second 

 specimen (Fig. 42, t.). 



The skull of this 

 specimen is much 

 crushed and broken, 

 but nevertheless much 

 may be learned from 

 it. In general form it 



. Fig. 42. Icht/tyoiiectes HiHitiiicntat us Co'pe. No. 1743. 



resembles that of Gil- SUull X J ; tooth X 2. als., alisphenoid ; b. oc, basioc- 



cipital ; ep. o., epiotic ; eth.^ ethmoid ; ejc. oc, exoccipital ; 

 liens areiiatUS (Cope) , A-, frontal : ;«.r., maxilla ; /a., parietal ; jiar., parasphe- 



noid ;/?-_/., prefrontal ; /ro., prootic ;/. J'/., presphenoid; 

 although the bones are /</•, postfrontal ; j-. oc, supraoccipital ; sg., squamosal ; 



vert.^ vertebra; vom., vomer. 



not so thin. As in 



that species, there is a strong upward flexure of the axis in 

 the basisphenoidal region. The snout is pointed, and there 

 is a high supraoccipital crest. The maxilla has been de- 

 scribed by Cope. It bears teeth, or spaces for them, to the 



