﻿ACANTHODTDiE. H 



head with branchial apparatus, and contained about live times in. 

 the total length. Fin-spines slender, the length of the pectorals 

 less than the depth of the trunk at their point of insertion, and the 

 pelvic spines scarcely more than half as long as these. Pelvic fins 

 with much elongated base-line, arising midway between the pec- 

 torals and the anal ; anal spine about equal in size to the pelvic 

 spines, and the anal fin separated by a considerable space from the 

 caudal. Dorsal fin very large, arising about midway between the 

 pelvic fins and the anal. Scales marked with very fine, straight or 

 irregularly wavy striae. 



Form. <$f Loc. Lower Old fted Sandstone : Banffshire, Nairnshire, 

 Cromarty, Hoss-shire, Caithness, and the Orkney Isles, Scotland. 



P. 1355. Two crushed specimens in nodules ; Gamrie, Banffshire. 



Egerton Coll. 



P. 1355 a-b, P. 3257 a-b. Two split nodules, each containing a 

 crushed and imperfectly preserved fish ; Gamrie. 



Egerton and Enniskillen Colls. 



36063. Small fish, laterally crushed, showing the pelvic, dorsal, and 

 anal fins, and portions of the pectorals and caudal ; Tynet 

 Burn, Banffshire. Purchased, 1861. 



41412, 41412 a. Small specimen, showing partial impressions of 

 the muscular myotomes, and a fish about 0*17 in length 

 with well-preserved remains of the pectoral, pelvic, and 

 anal fins ; Tynet Burn. Purchased, 1869. 



P. 1356. Three specimens more or less crushed and distorted, one 

 displaying the circumorbital dermal plates ; Tynet Burn. 



Egerton Coll. 



P. 1356 a, P. 3254. Split nodule with greater portion of a fish 

 wanting the caudal fin ; Tynet Burn. In this specimen 

 the cartilages of the jaws and portions of the basipterygium 

 are exhibited. Egerton, and Enniskillen Colls. 



P. 544. Type specimen of Cheiracanthus microlepidotus, figured by 

 Agassiz, loc. cit, fig. 2 ; Lethen Bar, near Nairn. 



Egerton Coll. 



28865. Two small crushed and contorted fishes, slightly larger than 

 the last ; Lethen Bar. Purchased, 1854. 



P. 1351. Imperfect fish about 0-16 in length ; Lethen Bar. 



Egerton Coll. 



P. 4614. Remains of a smaller fish, determined by Agassiz as 

 C. microlejpidotus ; Lethen Bar. Enniskillen Coll. 



PAET II. C 



