340 
SELACHII. 
Genus SCYLLIUM, Cuvier. 
[Etgne Animal, vol. ii. 1817, p. 124.] 
Syn. Thydlina, I,. Agassiz, Poiss. Foss. vol. iii. 184.3, p. 378. 
Scylliodus, L; Agassiz, tom. cit. p. 377 (in part). 
First dorsal fin above or behind the pelvics ; origin of anal always 
in advance of that of the second dorsal. Upper edge of the caudal 
fin not serrated. Tooth small, delicate, with a middle longer cusp, 
and generally one or two small lateral cusps, arranged in numerous 
series. 
Scyllium angustum (Agassiz). 
1843. Thydlina anymta, L. Agassiz, Poiss. Foss, vol, iii. p. 378, pi. xxxix. 
fig. 3. 
1873. Thydlina anguata, W. von der March, Palajontogr. vol. xxii. p. 64, 
pi. ii. figs. 6, 7. 
1882. Scyllium catulm, C. Hasse {non Linn.), Natiirl. Syst. Elasmobr., 
Besond. Theil, p. 262. 
Type. Fish, wanting head ; Woodwardian Museum, Cambridge, 
and Munich Museum. 
Pectoral fins large ; pelvic fins truncated behind, slightly in 
advance of the opposing first dorsal. Second dorsal fin larger than 
the first dorsal, and also much larger than the anal, to which it is 
almost completely opposed. [Teeth unknown.] 
This species, the ty]Jo of Thyellina, is referred to Scyllium by 
Ilasse and identified by him with S. catulus { — S. cankula) ; the 
fossil form, however, is readily distinguished specifically by the 
character of the fins. 
Form. ^ Loc. Upper Cretaceous (Senonian): Westphalia. 
Scyllium antiquum (Agassiz). 
1843. Scylliodus antiquus, L. Agassiz, Poiss. Foss. vol. iii. p. 378, 
pi. xxxviii. figs. 1, 3 {non fig. 2). 
Type. Imperfect head, &c. ; British Museum. 
Teeth with a very' slender coronal emincnco, and a single pair of 
widely separated short lateral denticles. Posterior coronal face in 
most of the teeth, and both faces of the crown in those placed at 
the back of the jaw, vertically striated. 
Form. 4" Toe. Turonian : Kent. 
P. 472, P. 5889. Typo specimen, preserved in counterpart, exhibit- 
ing remains ot the head, with a few scattered teeth and 
imperfect vertebne ; Lower Chalk, Burham, Kent. A few 
