280 
it is simply a variety. It cannot be confonncled witli G. glohiceps on account 
of the small number of rings on the axis of the pygiclium, and the division of 
its lateral rings, which are simple in G. glohiceps. 
Horizon and Localities . — This species has been known since 1825, and 
was first found in the Upper Carboniferous Limestone of Lussia, on the 
banks of the Serena in the District of Kozel, Province of Kalouga, and at 
Kosatschy-Datschy in the Oural. Since then it has been found in the same 
limestone at Bolland, Yorkshire, and at Vise in Belgium. Mr. Clarke found 
a nearly perfect specimen in a lirownish limestone on the Upper M^illiams 
River. 
G'ewws— BRACHYMETOPUS, F. McCoy. 
Brachtmetopus Strzeleckii, F. McCoy. 
PI. XXIV, Fig. 10. 
Brachymetopus Strzelecldi, F. McCoy, 1847, Anu. Mag. Nat. Hist., XX, p. 231, pi. 12, 
fig. 1. 
,, ,, V. V. Moeller, 1867, Bull. Soc. Imp, Nat. Moscou, p. 190. 
This is a charming little sj)ecies, the sub-semicircular cephalic shield 
of which is surrounded by a border relatively broad, terminating on each 
side in a genal angle which prolongs itself at least half the length of the 
thorax. This border is ornamented by a simple series of small tubercles 
which do not exist on the genal angles ; it is separated from the rest of the 
cephalic shield by a semi-circular groove having its origin on each side of 
the posterior groove of the cheeks, with wliich it forms a light angle ; 
this passes to the base of the glabella whence it then constitutes the neck 
furrow. The glabella is simple, suboval, and not very prominent, it occupies 
only two-thirds of the total length of the cephalic shield; the cheeks are 
convex ; there is a string of small tubercles all round the glabella, a little 
larger than those ornamenting the rest of the surface ; similar tubercles 
surround tlie eyes, which are placed towards the middle of the cheeks and 
are rather prominent. The thorax I do not know. The pygidium has nearly 
the same sub-semicircular form as the cephalic shield, and it is also surrounded 
by a border bearing a series of pointed tubercles, corresponding to the 
marginal extremity of the lateral rings ; these, numbering seven, are 
unequally divided in the middle by a shallow groove; the thickest part shows 
