﻿212 ANTIARCHA. 



and is bordered below by a large membranous caudal fin (PI. VI. 

 fig. 3, .r) of uncertain shape. There are no pelvic fins, the 

 determination of their presence by Egerton l being founded upon a 

 mistake 2 . 



Pterichthys milleri, Agassiz. 

 [Plate V. figs. 2-7.] 

 v 1841. Pterichthys milleri, H. Miller {ex Agassiz), Old Red Sandstone, 

 ■"" p. xxii, pis. i. & ii. 

 1844. Pterichthys milleri and P. lotus, L. Agassiz, Poiss. Foss. vol. ii. 



pt. i. p. 302 (names only). 

 1844. Pterichthys latus, L. Agassiz, Poiss. Foss. V. G. R. p. 12, pi. iii. 



figs. 3, 4. [British Museum and Forres Museum.] 

 1844. Pterichthys milleri, L. Agassiz, ibid. p. 15, pi. i. figs. 1-3. 

 1848. Pterichthys quadratus, Sir P. Egerton, Quart. Journ. Geol. Soc. 



vol. iv. p. 313, pi. x. [Geological Society of London.] 

 1848. Pterichthys latus, Sir P. Egerton, ibid. p. 312. 

 1855. Pterichthys latus, F. M'Coy, Brit. Palseoz. Foss. p. 600. 

 1888. Pterichthys milleri, R. H. Traquair, Geol. Mag [3] vol. v. p. 509. 



Type. Head, trunk, and base of tail, ventral aspect ; Edinburgh 

 Museum. 



The type species. Inferior surface of carapace broadly ovate ; 

 tail about equal in length to the trunk. Pectoral appendages two- 

 thirds as long as the trunk, not expanded, tapering. 



Form. Sf Loc. Lower Old Red Sandstone : Cromarty, Banffshire, 

 and Nairnshire. 



P. 6259. Paper model of carapace, made by Hugh Miller. 



Egerton Coll. 



(i.) Cromarty (typical P. milleri). 



19804. Imperfectly preserved small specimen in counterpart. 



Purchased, 1845. 



P. 654. Imperfect similar specimen, wanting head ; bearing auto- 

 graph of Hugh Miller. Egerton Coll. 



P. 3213. Small crushed trunk and head, in counterpart. 



EnnisTcillen Coll. 



21974. Imperfect head, trunk, and pectoral appendages, ventral 

 aspect, as large as the typical P. latus. Purchased, 1848. 



1 Quart, Journ. Geol. Soc. vol. xvi. (1860), p. 127. 



■ E. H. Traquair, Geol. Mag. [3] vol. v. (1888), p. 509. 



