27 
ornamentation, in addition to an occasional slight median longitudinal keel. 
The scutes of the lateral line, though of smaller size, appear to he of a very 
similar form, only differing in their more keeled character, due to the presence 
of the longitudinal perforation ; and the latter is well shown in the fossil hy 
the iufiiltration of a conspicuous white thread of calcite. 
RemarJes. — B. gigas may he distinguished from all known species of 
the genus hy the relative breadth of the dorsal and ventral scutes. In size, 
it is almost equalled hy B. acutus^' and B. macrocephalus,-\ and in the relative 
proportions of the head and trunk it is closely paralleled hy the latter species; 
hut B. acutiis possesses spine-shaped dorsal scutes (PL VIII, Pig. 7), and in 
B. macrocephalus these defences arc not much broader. 
It is interesting to add tliat evidence of a still larger species of Belon- 
orhgnchus occurs in the Keuper of Seefeld, Tyrol, a crushed skull (as pointed 
out hy ZittelD being described hy Kner§ under the name of Teleosaurus 
tenulstriatus. 
BELONORHYNCmiS GRACILIS, 8p. HOV. 
PI. VIII, Fig. 5 ; PL IX, Figs. 3, 4 ; PI. X, Figs. 3, 4. 
Ods. — A second species of Belonorhynchus is indicated hy a fish of 
much more slender and delicate porportions than B. gigas, and usually smaller. 
Its character can he very completely ascertained from the following series 
of specimens : — 
{(() A nearly complete head and trunk, seen from the ventral aspect, 
wanting all the fins except portions of the anal and caudal. 
This is the type-specimen shown of the natural size in PI. 
VIII, Pig. 5. 
{b) Detached head, side view (PI. X, Pig. 3). 
(c) The greater portion of the trunk, side view, with imperfect 
pelvic and median fins. 
{d) The greater portion of the trunk, side view (PI. IX, Pig. 3). 
{e) Hinder portion of the trunk, showing fins (PI. IX, Pig. 4). 
* Belonostomus acutus, L. Agassiz, Kech. Poiss. Foss., 1813, Vol. ii, Pt. ii p. 142, PI. xlvii a, figs. 3, 4. 
Assigned to Belonorhynchus by K. A. von Zittel, llandbucli Palceontologie, Vol. iii, p. 222. 
+ W. Deecke, “Fisdie aus den sebwarzen Schiefern von Perledo,” Palseontogrsphica, 1889, Vol. sxxv, pp. 
127-131, PL viii, figs. 1, 2. 
J K. A. von Zittel, Handbuch Palreontologie, Vol. iii, p. 266. 
§ R. Kner, “ Nachtrag zur fossileu Fauna der Asphaltschiefer von Seefeld in Tirol,” Sitzungsb. math." 
rratur. Cl. k. Akad. Wiss., 1867, Vol. Ivi, Pt. i, pp. 905-909, PI. iii. 
11a 74—90 G 
