306 
ARTHRODIRA. 
in Pander’s partial restoration (fig. 2 9 ) ; ? Asmuss, no. 31 
(“ os mnltifixum ” of H. formosissimus ), p. 37. 
15142 i. Posterior portion of left lateral occipital, the type speci¬ 
men of H. ponderosus , Asmuss (p. 37, no. 33), described 
as right “ os multifixum.” 
15142 z. Two undetermined hones (Agassiz, pi. xxxii. figs. 9, 10) ; 
the type specimens of H. anceps , Asmuss (p. 39, no. 28). 
Homostens milleri, Traquair. 
1849. “Asterolepis of Stromness,” H. Miller (non Asterolepis,Y aqFw&IA), 
Footprints of the Creator, p. 70, woodc. figs. 24, 27-29, 36, 37, 
39-41 (P figs. 34, 35, 38, 44, non figs. 25, 26, 30-33, 42). 
1854. Asterolepis asmusii , J. Morris (i non Agassiz), Catal. Brit. Foss. 
2nd ed. p. 318. 
1857. Homostius, C. H. Pander, Placoderm. devon. Syst. p. 74, pi. viii. 
figs. 3 a-c. 
1860. Homostius , sp. nov., E. Ton Eichwald, Leth. Bossica, toI. i. 
p. 1520. 
1869. Asterolepis, J. Miller, Geol. Mag. vol. vi. p. 384. 
1888. Homosteus milleri, B. H. Traquair, Geol. Mag. [3] vol. y. p. 511. 
1889. Homosteus milleri , B. H. Traquair, ibid. vol. vi. p. 1, pi. i. fig. 1. 
/ Type. Cranial shield ; Edinburgh Museum. 
A species sometimes equalling H. in size. Median occipital 
tapering forwards, its anterior border less than half as wide as the 
posterior ; external occipital twice as long as its maximum breadth. 
Median dorsal plate narrower behind than in front, the posterior 
margin obtusely angulated in the middle; ornamented portion of 
anterior dorso-lateral twice as long as broad, and the forwardly- 
directed process somewhat spatulate; posterior dorso-lateral rela¬ 
tively very small, triangular in form, with the hinder apex deflected 
inwards. 
Form. Sf Log. Lower Old Bed Sandstone : Caithness and Orkney. 
P. 5539. Plaster cast of the head and trunk, showing the boundaries 
and arrangement of the dorsal plates, and some of the 
displaced jaw-hones, &c.: Thurso. The original specimen 
is preserved in the Museum of Science and Art, Edinburgh, 
and is described and figured by Traquair, loc. cit. 1889. 
The figure is reproduced in the accompanying woodcut 
(fig. 46), and explained by the lettering. 
Presented by the Lords of the Committee 
of Council on Education, 1888. 
