346 
SELACHII. 
less than ten cartilaginous rays. The pelvic arch and fins 
(plv.) are more satisfactorily preserved, and remarkable 
on account of their relatively largo size ; there is a dis- 
tinct prcpubic process {p.pb.), and the hasal pterygium 
of the fin is much elongated, hearing not less than sixteen 
robust cartilaginous rays. The first dorsal fin (cV) is only 
seen upon the counterpart of the fossil, hut is introduced 
into the figure for completeness. It is situated imme- 
diately behind the pelvics, and still further postcriorlj^ are 
a few rays of another small median fin(cf') above the neural 
arches, evidently to be interpreted as the second dorsal. 
No traces of the anal fin can be discerned. A few im- 
pressions of the muscles occur in the abdominal region ; 
but there is no evidence of shagreen upon any portion of 
the fossil, and the only external dermal structures are 
some of the series of calcified rings supporting the groove 
of the lateral lino. A portion of the counterpart is en- 
larged four times to sho w the latter, in PI. XVI. fig. 3(1.L), 
the structures having already been described by the present 
writer (Proc. Zool. 8oc. 1888, p. 126). 
Purchased, 1878, 1884. 
46506, 49515. Two imperfect specimens ; a tooth of the first shown, 
of twelve times the natural size, in PI. XVI. fig. 2. 
Purchased, 1875, 1878. 
Mesiteia emilise, Kramberger. 
1885. Mesiteiaemilice,'D. Gorganovic Kramberger, Rad Jugoslav. Akad. 
vol. Ixxii. p. 64, pi. iii. fig. 2 h 
Type. Nearly complete skeleton ; Geological Museum, University 
of Agram, Croatia. 
The type species, somewhat larger than M. sahel-almce, and dif- 
fering in the relatively larger size and more posterior situation of 
the dorsal fins. 
Form. ^ hoc. Middle Eocene : Monte Bolca, near Verona. 
Genus CfHIiOSCYLLIXTlVI, Muller & Henle. 
[Syst. Eesohreib. Plagiostom. 1841, p. 17.] 
First dorsal fin above or behind the pelvic tins ; the anal fin far 
behind the second dorsal, and very close to the caudal. Teeth 
small, triangular, with or without lateral ousps. 
* A German abstract of this memoir appeared in 1886. 
