206 
AXTIARCIIA. 
Asterolepis maxima (Agassiz). 
[Plate Y. fig. 1.] 
1845. Coccosteus maximus, L. Agassiz, Poiss. Foss. V. G. R. p. 137, 
pi. xxx. a. figs. 17, 18. 
1848. Pterichthys major , H. Miller ( non Agassiz), Quart. Journ. Geol. 
Soc. toI. iv. p. 311. 
1857. Asterolepis , C. II. Pander, Placoderm. devon. Syst. p. 17. 
1860. Coccosteus maximus = Asterolepis ornata, E. von Eichwald, Leth. 
Rossica, vol. i. p. 1508. 
1888. Asterolepis maximus , R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 508, and Ann. Mag. Nat. Hist. [6] vol. ii. p. 494, pi. xviii. 
figs. 1, 2. 
Type. Imperfect anterior median dorsal plate; Geological Society 
of London. 
A very large species, attaining more tfian twice the size of 
A ornata. Anterior median dorsal plate with a faint longitudinal 
carina; anterior extremity tapering, its breadth being not more 
than half that of the posterior extremity. Superficial tubercles 
large, rounded, closely arranged, rarely fused together. 
The type specimen of this species was regarded by Agassiz as a 
median ventral plate, but is shown by Miller and Pander to be 
anterior median dorsal, while the last-named author determines its 
correct generic position. 
Form. Log. Upper Old Red Sandstone : Nairn. 
38710-15. Six imperfect examples of the anterior median dorsal 
plate in various states of preservation. The first specimen 
measures 0T5 in length, is exposed from the inner aspect, 
and displays portions of the lateral overlapping edges; it 
is shown, of one third the natural size, in PI. V. fig. 1. 
Purchased , 1864. 
38001. Smaller anterior median dorsal plate. Purchased, 1861. 
P. 5052. Imperfect impression of a similar plate; King’s Steps. 
Presented by John Edward Lee, Esq., 1885. 
28875. Right posterior dorso-lateral. Purchased, 1854. 
38716. Right posterior dorso-lateral. Purchased , 1864, 
P. 5052 a. Imperfect similar plate, displaying areas overlapped by 
the median dorsals. 
Presented by John Edward Lee, Esq., 1885. 
28875 a. Portion of lateral plate. Purchased, 1885. 
