﻿ASTEROLEI>IDJE. 



219 



Agassiz, op. cit. pi. i. fig. 4. The trunk is seen from tbe 

 ventral aspect, but its correct outline is apparently de- 

 stroyed. Egerton Coll. 



P. 3208 a. Second type specimen of P: cancriformis, figured ibid. 

 fig. 5. EnnisJcillen Coll. 



34987-89. Two large specimens exhibiting tbe tail, and one small 

 specimen. Purchased, I860. 



35047. Imperfect large specimen ; Stromness. Purchased, 1860. 



38731-32. Small specimen and portion of larger individual. 



Purchased, 1865. 



41998. Comparatively well preserved specimen, ventral aspect, 

 showing displaced mental plates ; Stromness. 



Purchased, 1870. 



P. 660-2. Small distorted specimen and two more imperfect larger 

 examples ; Belyacreugh. Also a fragment, with pectoral 

 appendages, from Ramna Gio. Egerton ColL 



P. 3208. Two specimens, ventral aspect. EnnisTcillen ColL 



Pterichthys oblongus, Agassiz. 

 [Plate Y. fig. 10 ; Plate VI. figs. 3, 4.] 



1844. Pterichthys oblongus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 302 



(name only). 

 1844. Pterichthys oblongus, L. Agassiz, Poiss. Foss. V. G. R. p. 18 r 



pi. iii. figs. 1, 2. 

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



vol. iv. p. 313. 

 1855. Pterichthys oblongus, F. M'Coy, Brit. Palaeoz. Foss. p. 600. 

 1888. Pterichthys oblongus, R. H. Traquair, Geol. Mag. [3] vol. v, 



p. 509. 



Type. Imperfect trunk and tail, ventral aspect ; Elgin Museum. 



Inferior surface of carapace long and narrow, sides nearly straight ; 

 tail shorter than the trunk. Pectoral appendages less than two 

 thirds as long as the trunk, the distal segment considerably ex- 

 panded. 



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

 and Cromarty. 



(i.) Gamrie. 

 28856 a. Imperfect specimen, ventral aspect, in counterpart. 



Purchased, 1854. 



