ANOMCODUS. 163 
are absent on the tail and do not appear to have covered the whole of the 
abdominal region. 
1. Anomeodus angustus (Agassiz). Plate XXXIV, figs. 3, 4. 
1837-44. Gyrodus angustus, L. Agassiz, Poiss. Foss., vol. ii, pt. 11, pp. 235, 246, pl. Ixvia, figs. 14, 15. 
1839-44. Pycnodus cretaceus, L. Agassiz, ibid., p. 198, pl. lxxiia, fig. 60. 
1833-44. Pycnodus angustus, L. Agassiz, ibid., pt. i, p. 17, pt. li, p. 199 (name only). 
1844. Pycnodus elongatus, L. Agassiz, ibid., p. 199 (name only). 
1850. Gyrodus angustus, F. Dixon, Geol. Sussex, p. 370, pl. xxx, fig. 14, pl. xxxiu, fig. 1. 
1888. Celodus angustus, A. S. Woodward, Proc. Geol. Assoc., vol. x, p. 307. 
1888. Celodus cretaceus, A. 8. Woodward, ibid., p. 308. 
1895. Anomeodus angustus, A. S. Woodward, Catal. Foss. Fishes B. M., pt. 111, p. 260. 
Type.—Splenial teeth from a Turonian zone at Houghton, Sussex; British 
Museum. 
Specific Characters.—Veeth of the principal series on the splenial bone very 
obliquely set, truncated at their outer extremity, rapidly tapering to a blunt 
point at the imner extremity, and when young and unworn marked with a shght 
transverse coronal furrow; imner teeth in two irregular series, those of the first 
elongated, those of the innermost much smaller and round, both deeply pitted and 
with crenulated margin; teeth of the flanking series in about three or four 
very irregular rows, all deeply pitted and with crenulated margin, the innermost 
transversely elongated and much larger than any of the others, which are rounded. 
Scales marked with coarse reticulations; serrations of the ventral ridge-scales 
conspicuous, long and slender. 
Description of Specimens.—The type specimen is a row of principal splenial 
teeth, sufficiently resembling the corresponding teeth in part of a fish figured by 
Dixon, op. cit., to permit the reference of the latter specimen to the same species. 
Several of the most important characters of the species are therefore known. 
‘The fossil figured by Dixon is in two pieces, the one showing a series of 
neural arches with the upper ends of the ribs, the other partly re-drawn in 
Pl. XXXIV, fig. 3, displaying the lower half of the greater portion of the fish 
with both splenial bones and a fragment of the skull. The usual bony laminz on 
the neural and hemal (h.) arches are large, extending from one arch to the 
next but not interdigitating. There are traces of them even on the ribs. The 
bases of the neural and hemal arches do not completely surround the notochord, 
and there is no interlocking. About twenty-five supports for the anal fin (a.) are 
seen, but no other traces of fins are preserved. The scales are coarsely reticulated 
like the scales of a crocodile, and cover the lower part of the abdominal region 
in front of the anal fin. The ventral ridge-scales (v.) are at least as wide as 
deep, and armed with a close series of backwardly turned sharp spinelets, which 
