﻿306 ARTHRODIRA. 



in Pander's partial restoration (fig. 2 9 ) ; ? Asmuss, no. 31 

 (" os multifixum " 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). 



Homosteus miller i, Traquair. 



1849. ll Asterolepis of Stromness," H. Miller (non Aste?-olepis,'Eichw'dld), 

 Footprints of the Creator, p. 70, woodc. figs. 24, 27-29, 36, 37, 

 39-41 (? figs. 34, 35, 38, 44, non figs. 25, 26, 30-33, 42). 



1854. Asterolepis asmusii, J. Morris (non Agassiz), Catal. Brit. Foss. 

 2nd ed. p. 318. 



1857. Homostius, C. H. Pander, Placoderm. devon. Syst. p. 74, pi. viii. 

 figs. Sa-c. 



1860. Homostius, sp. nov., E. von Eichwald, Leth. Eossica, vol. i. 

 p. 1520. 



1869. Asterolepis, J. Miller, Geol. Mag. vol. vi. p. 384. 



1888. Homosteus milleri, R. H. Traquair, Geol. Mag. [3] vol. v. p. 511, 



1889. Homosteus milleri, R. H. Traquair, ibid. vol. vi. p. 1, pi. i. fig. 1. 



Type. Cranial shield ; Edinburgh Museum. 



A species sometimes equalling H. latus 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 Red 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-bones, &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. 



