﻿29li ARTURODIEA. 



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, fy Loc. Upper Old Red 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. 3226-a. Two similar plates more imperfectly preserved. 



Enniskillen Coll. 



41901. Right posterior ventro-lateral plate, inner aspect, shown, of 

 the natural size, in PI. 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, H. von Meyer, Palaeontogr., 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. 



