338 
SELACHII. 
The following “genera” and “species” may possibly be founded 
upon the anterior teeth of undetermined Cestraciontidae, but their 
systematic position is uncertain •— 
Doratodus tricuspidaius, E. E. Schmid, Nova Acta Acad. Caes. 
.Lc+S* ^^"TLeop.-Car. vol. xxix. no. 9 (1861), p. 10, pi. i. figs. 28-37; 
ff'*$/3. * H. Eck, FarER bunt. Sandst. u. Wuschelk. Oberschlesien 
5/* * (1865), p. 61; and E. E. Schmid, Abh. Geol. Specialk. 
Preussen u. Thiiring. Staaten, vol. i. pt.ii. (1874), p. 56.— 
"^T/TT Keuper, Germany. ^ 
/ Gomphodus agassizii, A. E. Reuss, Yerstein. bohm. Kreideform. 
• w-hfU'y ip (1846), p. 99, pi. xxi. figs. 22-25; A. Eritsch, Kept. 
Ljf u. Eische bohm. Kreideform. (1878), p. 10, woodc. fig. 20. 
—' —Cenomanian ; Bohemia. 
The following specimens in the Collection are referable to the 
latter “ genus ”:— 
41702. Complete tooth ; Chalk, Gravesend, Kent. 
Toulmin Smith Coll. 
P. 334. Two teeth ; Chalk, Charing, Kent. Harris Coll. 
Family SCYLLIUXE. 
Dorsal fins without spines, the first situated above or behind the 
pelvic fins. Xo nictitating membrane. Teeth small, several series 
being generally in function. 
Genus PAL^OSCYLliIUM, Wagner. 
[Gelehr. Anz. bay. Akad. Wiss. vol. xliv. 1857, p. 291.] 
First dorsal fin above or partly behind the pel vies ; origin of 
second dorsal in advance of the anal, which is small. Tail of 
moderate length. [Teeth unknown, but probably minute.] 
As pointed out by Wagner, the arrangement of the fins in this 
genus is suggestive of Ginglymostoma: and Hasse describes 1 the ver¬ 
tebral column as indistinguishable from that of Scyllium. 
Palseoscyllium formosum, Wagner. 
1857. Palceoscyllium formosum, A. Wagner, Gelehr. Anz. bay. Akad. 
Wiss. vol. xliv. p. 291. 
1 Natiirl. Syst. Elasmobr., Besond. Theil, p. 252, pi. xxxiv. fig. 27. 
