CEPHALASPIDiE. 
197 
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. <$f Loc. Lower Old lied Sandstone Passage Beds : Ledbury, 
Herefordshire. 
[P. 6023.] Small individual, dorsal aspect, mingled with a large 
group of Cephalaspis murchisoni (PI. 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 verticallv- 
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, ojjposed 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 PL. 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 PI. X. fig. 6. 
Presented by George H. Piper, Esq., 1889. 
36187-90. Four typical shields, from the “ Auchenaspis- Grit.” 
Purchased, 1861. 
46954. T wo associated shields in similar matrix. Purchased, 1876. 
P. 675. Six shields in similar matrix. Egerton Coll. 
P, 3237. Four similar specimens, two being associated. 
Enniskillen Coll. 
