376 
SELACniI. 
Alopecias hassd, F. Noetling, Abh. Geol. Specialk. Preusscn u. 
Thliring. Staatcn, vol. vi. pt. 3 (1885), p. 75, pi. v. 
figs. 4a-/. — Upper Eocene (Zone A,); Samland, Prussia. 
Vertebra; from the llupelian of Boom, near Antwerp, and 
Briistcrort, N. Germany, have also been assigned to this genus by 
C. llasse, Natiirl. Syst. Elasmobr., Besond. Theil (1882), p. 223, 
pi. xxix. flg.s. 22, 2.J. They are further remarked upon by 
F. Noetling, tom. cit. p. 78, jd. x. fig. 3. 
Genus OXYRHINA, Agassiz. 
[Poiss. Foss. vol. iii. 1838, p. 80.] 
Second dorsal fin and the anal very small. A pit at the root of 
the caudal fin, which has tlie lower lobe much developed ; side of 
tho tail with a keel. Teeth large, anteriorly lanceolate, postcro- 
laterally triangular and much compressed, without lateral denticles. 
Although only differing from Lmnna in the prevailing absence of 
lateral denticles in the teeth, it is conveuieut, from a pahcontological 
point of vicvv, to retain O.vyrhiun as a distinct genus ; more especially 
as several forms of these teeth bear specific names identical with those 
applied to other teeth referable to Lamna proper. 
Oxyrhina xnantelli, Agassiz. 
1822. Si/ualm zyytena P,G. A. Mautell, Foss. S. Downs, p. 227, pi. x.xxii. 
figs. 4,7, 8, 10, 11,20, 28. 
18.39. O.vtjrhina, II. B. (teinitz (er Agassiz), Oliaraet. Schiclit. u. Petre- 
fiilit. sachs.-bohni. Krcidegeb. p. 12, pi. i. fig. 4 (in part). 
184.3. O.vyrhma mantelli, E. Aga.ssiz, I’oi.ss. Foss. vol. iii. p. 28'J, 
pi. xxxiii. tigs. 1-5, 7-9 (««/« fig. 0). 
1843. iMinna acuminata, L. Agassiz, to)n. cit. p. 292, pi. xxxvii. a. 
fig. 64 (? non figs. 56-67). 
184.5. Oxyrhina manteUi, ,\. E. Reus.s, Verstein. bohm. Kreideform. pt. i. 
p. 6, pi. iii. figs. 1, 3, 6, 0 (? fig.s. 2, 4). 
(P) 1849. O.iyrhina mantelli. It. W. Gibbes, Journ. Acad. Nat. Sci. 
Philad. [2] vol. i. p. 202, pi. xxvii. fig. 458. 
1860. Oxyrhina mantelli, 4. Di.vou, Fos.s. Sussox, pi. .xxx. fig. 24. 
18.50. Lamna acuminata, F. Dixon, op. cit. pi. xxx. fig. 19. 
1862. 0.cyrhina mantelli, P. Gervais, Zool. ot Pal.'’Frau 9 . pi. ixxvi. 
fig.s. 3, 20. 
(.') 1852. O.vyrhma, H. Kner, Donk.schr. k. .\kad. Wiss. Wien, vol. iii. 
pi. XV. fig. 3. 
I860. 0.vyrhina mantelli, C. E. Fisclior, Allg. deutsch. natiirli. Zeit. 
Dre.sden, n. s. vol. ii. p. 141, pi. ii. fig. 4.3. 
