Fossil Fishes of the Upper Oid Red Sandstone. 383 
Holoptychius giganteus, Agassiz. 
The fragmentary plate from Scaat Craig, described and 
figured by Agassiz (Poiss. Foss. v. g. r., p. 147, pl. 30a, 
fig. 16) as “ Asterolepis Malcolmsoni,” was supposed by Mr 
Smith Woodward, who had not seen the type, to be 
possibly identical with A. maxima (Cat. Foss. Fishes Brit. 
Mus., pt. ii, p. 207). However, I was fortunate enough 
to discover the original specimen in the Elgin Museum, 
and find that it is a broken jugular plate of Holoptychius 
guganteus. 
Sauripterus crassidens, sp. nov., Traquair. 
[Plate XI., Fig. 7.] 
This conical tooth, represented in Pl. XL, Fig. 7, of the 
natural size, measures + inch in length by nearly 3 inch in 
greatest breadth at the base; the apex is rounded off by 
attrition; the shaft is laterally compressed with trenchant 
edges. Towards the base the surface of the tooth is “ fluted,” 
a number of sulci marking off vertical folds of the dentine; 
the primary folds being rather less than 51, inch, the 
secondary about 54, inch across. 
The above-described tooth was collected by Mr William 
Taylor at Newton Quarry, Alves, and is now in the Edin- 
burgh Museum; but there are also two others, identical in 
character, from Scaat Craig, in the Brickenden Collection in 
the British Museum (P. 82694), All three are not only 
clearly Rhizodont in structure, but come, indeed, very close 
to the teeth of Agassiz’s “Bothriolepis” favosa,! from Clash- 
bennie in Perthshire, also a very decided Rhizodont, and 
which Mr Smith Woodward? has provisionally referred to 
Hall’s genus Sawripterus.? However, on closely comparing 
them with the teeth in the Clashbennie jaws, I have come to 
1 Poiss. Foss. v. g.r., pp. 61-100, pl. xxvii., fig. 7; pl. xxviii., figs, 12, 13. 
* Cat. Foss. Fishes Brit. Mus., pt. ii., 1891, p. 365. 
3 Nat. Hist. New York, pt. iv., Geology, 1843, p. 282, The name is 
here spelt ‘‘ Sauripteris.” 
