175—4 
SUPPLEMENT TO CRANIA OE RUMINANTS. 
new skull, however, has the horn-cores less pyriform in cross-section than those of the 
other s]3ecimen, and with a less forward inclination. The form of the facial part of this 
skull also shows that it is identical with Hemihos triquetriceros of Ealconer (E.A.S. 
Plate H., figs. 1, 3), and also that the skull which I have figured in Plate XXIV as 
AmpMhos belongs to the same sj)ecies. The horn-cores of the Roorkee skull, 
and of the specimen figured in Plate XX, are, however, very different from those of S. 
triquetriceros as figured hy Ealconer, one of the forms of which (E.A.S. , Plate H., fig. 2) 
has straight horn-cores with a most distinctly triangular cross-section, while in 
others the section is suh-circular (fig. 1). 
In his memoir, Professor Ptlitimeyer has figured the upper part of a skull with 
horns (Plate 1, figs. 8, 4) which he names tProhuhalus triquetricornis, being the equi- 
valent to Uemihos triquetriceros of Ealconer, hut calls it an abnormal or “trocho- 
ceros” ^ form of the species. This skull is similar to the skulls figured in Plates 
XX and XXI A of this volume except that the horn-cores are less closely approxi- 
mated to the occiput than in the first specimen. 
Of what he considers the normal male form of the species. Professor Riitimeyer 
has figured a skull (Plate VII, figs. 1, 2), wanting the greater part of the horn-cores ; 
in that skull the horn-cores, instead of curving forwards, as in the trochoceros form, 
appear, as far as can he judged from the portion remaining, to have been straight, 
and to slope backwards from the plane of the forehead : the latter has a high frontal 
ridge, and the whole aspect of the skull is extremely huhaline : the cross-section of 
the horn-cores is suh-triangular. 
Tavo other specimens of the skull of the normal male form are figured in figs. 1 
and 3 of Plate H of the “ Eauna Antiqua Sivalensis,” the latter being copied in Pro- 
fessor Rlitimeyer’s memoir (Plate IV, fig. 1). The horn-cores in the former of these 
specimens aj)pear to present a suh-circular cross-section. The skull represented in 
Plate XXIV of this volume appears to belong to the normal form of the male. 
In the skull drawn in fig. 2 of Plate H of the “ Eauna Antiqua Sivalensis,’’ 
the horn-cores have a most distinct triangular cross-section (noticed in the descrip- 
tion of the plate as being characteristic), and a marked angle on their frontal aspect. 
The horn-cores of this specimen are extremely different from those of the trocho- 
ceros-form (Plates XX, XXIA), in which the cross-section is distinctly pyriform, 
and the anterior aspect presents no trace of an angle. Erom this great difference, 
I had at first, till I saw intermediate specimens, no idea that the skull which I 
called JPerihos occipitalis could he Uemihos triquetriceros ; the latter sj)ecific name 
being utterly inapplicable to it, except on the lucus a nan lucendo principle. It 
indeed appears that the distinctly triangular form of the horn-cores of this species 
is an exceptional, in place of a normal character, there being only the one skull of 
Ealconer’s with this character well marked : further the horn-cores of AmpMhos 
acuticornis of Ealconer are very frequently most distinctly triangular (the cause of 
my errors of identification), and I have therefore come to the conclusion that the 
' Curved-horned. 
