PYCXODOXTIDJE. 
261 
1845. Pycnodus subdeltoideus, A. E. Reuss, ibid. pt. i. p. 10, pi. iv. 
figs. 38-42. [Detached teeth.] 
1850. Gyrodus angustus, F. Dixon, Geol. Sussex, p. 370, pi. xxx. fig. 14, 
pi. xxxiii. fig. 1 . 
1855. Pycnodus cretaceus, E. Hubert, Mem. Soc. Gfsol. France, [2] yoI. y. 
p. 353, pi. xxvii. fig. 7. 
1856. Pycnodus rhomboidalis , C. E. Fischer, Allg. deutsche Nat. Zeit., 
n. s., yoI. ii. p. 137, figs. 2, 3. 
1875. Pycnodus cretaceus , H. B. Geinitz, Palseontogr. yoI. xx. pt. i. 
p. 300, pi. Ixy. tigs. 12-14, and pt. ii. p. 217, pi. xl. figs. 30-32. 
1878. Pycnodus cretaceus , A. Fritsch, Kept. u. Fische bohm. Kreide- 
forrn. p. 22, pi. ii. figs. 1-4, woodc. 48. 
1878. Gyrodus angustus, A. Fritsch, ibid. p. 25, woodc. 53. 
1887. Ccelodus angustus , K. A. von Zittel, Handb. Paheont. vol. iii. 
p. 249. 
(?) 1887. Ccelodus cretaceus , K. A. von Zittel, ibid. p. 249. 
1888. Ccelodus angustus , A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 307. 
(?) 1888. Ccelodus cretaceus , A. S. Woodward, ibid. p. 308. 
% 
Type. Series of teeth ; British Museum (in part). 
A small species, known by the dentition and part of the head and 
trunk. Teeth of the principal series on the splenial bone very 
obliquely set, truncated at their outer extremity, rapidly tapering to 
a blunt point at the inner extremity, and when young and unworn 
marked with a slight transverse coronal furrow ; inner teeth in two 
irregular series, those of the first elongated, those of the innermost 
much smaller and round, both deeply pitted; teeth of the flanking 
series in about three or four very irregular rows, all deeply pitted, the 
innermost transversely elongated and much larger than any of the 
others, which are rounded. Scales marked with coarse reticulations, 
and serrations of the ventral ridge-scales conspicuous, long, and 
slender. 
The fragment of dentition named Pycnodus cretaceus seems to 
differ only from the typical corresponding teeth of this species in 
its relatively large size. There are intermediate specimens in the 
Collection. 
Form. Sf Loc. Senonian: S.E. England, and Meudon, France. 
Cenomanian : Saxony and Bohemia l . 
25731, 25780. Portion of axial skeleton of trunk, with another 
portion of fish displaying scales and the two splenial 
1 Specimens are also recorded from Switzerland by W. A. Ooster, Protozoe 
Helvetica, 1870, vol. ii. p. 45. A right splenial from the Daman of Maastricht, 
apparently not of this species, is named Anomceodus cretaceus (Ag.) by H. 
r Forir, Ann. Soc. Geol. Belgique, vol. xvi. (1889), Mem. p. 450, pi. xiv. fig. 2. 
sr cnZcyrzddt -cA r fcrr-sFe , S' d . ST?- &<n'cAe , , ft- 
