Dr. A. S. Woodward on Psammosteus tayloii. 649 



is allied to Vinata and Devadanda, and by the structure of 

 the antennge more to Vinata ; the position of their insertion, 

 the structure of the face, and the single series of transverse 

 veins to the apical areas of the tegmina will, however, prevent 

 any confusion. It is more nearly allied to the Australian 

 genus Kuranda^ Dist. 



Archa typicay sp. n. 



Head, pronotura, and raesonotura ochraceous j a lateral 

 fascia on each side of mesonotum black ; central area of face, 

 eyes, and antennas black ; sternum and legs piceous ; abdo- 

 men beneath with the posterior segmental margins san- 

 guineous and basally suffused with piceous ; tegmina creta- 

 ceous white, near middle crossed by a broken transverse black 

 fascia. 



Long., inch tegm., 8 mm. 



Hab. Ceylon; Peradeniya {Green), 



LXXI. — On the Upper Devonian Ostracoderm, Psammosteus 

 taylori. By A. Smith Woodward, LL.D., F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



[Plate IX.] 



In 1892, when studying Devonian fishes in the University 

 Museum of Dorpat, J observed a large, ovoid, convex dermal 

 plate exhibiting the characteristic texture and ornament of 

 Psammosteus paradoxus *. On returning to London I 

 identified a rough papier-mach^ copy of this plate which 

 had been presented to the British Museum by Sir Roderick 

 Murchison in 1842, but had not previously been determined f. 

 Som.e time afterwards Mr. William Taylor discovered in the 

 Upper Old Red Sandstone of Newton Quarry, Elgin, a nearly 

 similar plate, which he presented to the Royal Scottish 

 Museum ; and the close resemblance of this plate to the 

 Russian specimen was soon recognized by Dr. Traquair when 

 he examined the British Museum cast for comparison. 



* L. Agassiz, Poiss. Foss. V. G. R. (1845) p. 104, pi. B, figs. 5, 6, 

 pi. xxvii. figs. 2-4, 



t A. S. Woodward, " The Problem of the Primseval Sharks/' Nat. 

 Science, vol. vi. (1894) p. 38, fig. 1. 



Ann. & Mag, N. Hist, Ser. 8. Vol viii. 43 



