292 
ARTHRODIRA. 
Q- i~C-Q n.i- clw. /MJI ’ \ 
^Coccosteus disjectus, sp. nov. 
[Plate VIII. figs. 1-4.] 
Type. Associated median ventral plates ; British Museum. 
An imperfectly known species of moderate size. Anterior median 
ventral plate much broader than long, its obtuse posterior angle 
completely exposed and overlapping the anterior border of the 
median ventral; median ventral nearly twice as long as broad, its 
anterior extremity truncated, and its lateral angulation situated 
much behind the middle point. Posterior ventro-lateral plates 
nearly two-thirds as broad as long. Tuberculations of moderate 
size, having a somewhat radiating arrangement upon the anterior 
median ventral plate. 
Form, Loo. Upper Old Bed Sandstone : Kiltorcan, Kilkenny, 
Ireland. 
43039. Type specimen exhibiting the form and proportions of the 
associated median ventral plates, shown, of the natural 
size, in PI. VIII. figs. 1, 2. In fig. 2 the anterior ex¬ 
tremity has been inadvertently directed downwards. 
Purchased , 1871. 
P. 3228-a. Two similar plates more imperfectly preserved. 
Enniskillen Coll. 
41901. Bight posterior ventro-lateral plate, inner aspect, shown, of 
the natural size, in PL VIII. fig. 3. Purchased, 1870. 
43039 a. Fragment of plate, with ornamentation, partly shown, 
of twice the natural size, in PI. VIII. fig. 4. 
Purchased , 1871. 
Coccosteus hercynius, H. von Meyer. 
1852. Coccosteus hercynius, II. von Meyer, Palseontogr., vol. iii. p. 82, 
pi. xii. fig. 28. 
Type. Associated dermal plates. 
An imperfectly known species, nearly equal to the typical C. de- 
cipiens in size. Median occipital scarcely broader than long. 
Median dorsal plate less than twice as long as broad, the anterior 
border excavated, and the posterior border rounded. Posterior 
ventro-lateral plates more than three times as long as broad, much 
longer than the median dorsal. Tuberculations large, numerous, 
never confluent. 
Form. &;Loc. Lower Devonian : Harz Mts. 
