﻿CEPHALASPID.E. 1U7 



terior shield ; relatively large superficial tuberculations arranged in 

 two or three symmetrical pairs of antero-posteriorly directed lines. 

 Scaly trunk somewhat longer than the two shields. 



Form. $ hoc. Lower Old Red Sandstone Passage Beds : Ledbury, 

 Herefordshire. 



[P. 6023.] Small individual, dorsal aspect, mingled with a large 

 group of Cephalaspis murchisoni (PL X. fig. 1), and 

 shown, of the natural size, in PI. X. fig. 5. The scaly 

 trunk is somewhat longer than the shield with its pos- 

 terior plate, and the scutes are apparently arranged as in 

 Cephalaspis, the only modifications relating to the more 

 depressed form of the body. In transverse section the 

 trunk is almost a depressed oval ; the dorsal ridge is thus 

 less sharp, owing to the wider angle between the two 

 halves of the ridge-scutes, while the lateral scutes are 

 strongly arched in the direction of their long axis. 



. Presented by George H. Piper, Esq., 1889. 



P. 5316. Similar specimen more imperfectly preserved, partly 

 shown in counterpart; from red sandstone in Passage 

 Beds. Immediately behind the posterior dorsal shield, 

 the median series of flattened A-shaped dorsal ridge scales 

 occurs, and there are remains also of some of the vertically- 

 elongated flank scales. A small portion of the ventral 

 aspect of the fish is exposed, displaying beneath part of 

 the shield a number of irregular polygonal calcified 

 tesserae, and also suggestive indications of a broad conti- 

 nuous ventral plate, opposed to the hinder portion of the 

 dorsal shield. Presented by George H. Piper, Esq., 1887. 



P. 5315. Imperfect shield in similar matrix. 



Presented by George H. Piper, Esq., 1887. 



P. 6112. Imperfect shield in similar matrix, displaying portions of 

 the antero-posterior series of large tuberculations, and 

 shown, of the natural size, in PL X. fig. 6. 



Presented by George H. Piper, Esq., 1889. 



36187-90. Four typical shields, from the " Auchenasjris-Grit." 



Purchased, 1861. 



46954. Two associated shields in similar matrix. Purchased, 1876. 



P. 675. Six shields in similar matrix. Egerton Coll. 



P. 3237. Four similar specimens, two being associated. 



EnnisJciUen Coll. 



