﻿490 ACTHTOPTEKYGII. 



of the head and tail, displaying the squamation with parts 

 of the pelvic, dorsal, and anal fins ; Ohio. 



Egerton Coll. 



P. 1004 a. Fragment of small fish ; Cannel Coal, Linton, Ohio. 



Egerton Coll. 



Elonichthys aitkeni, Traqnair. 



1874. Acrolepis, J. Aitken, Trans. Manchester Geol. Soc. vol. xiii. 



p. 36. 

 1886. Elonichthys aitkeni, R. H. Traquair, Geol. Mag. [3] vol. iii. 



p. 440. 

 1890. Elonichthys aitkeni, J. Ward, Trans. N. Staffs. Inst. Mining 



Engin. p. 174, pi. vi. figs. 9, 12. 



Type. Imperfect fish ; olim J. Aitken Collection. 



A species of moderate size, attaining a length of about 0'18. 

 Head with opercular apparatus occupying about one-fifth of the 

 total length ; external bones ornamented with more or less wavy 

 striae, sometimes subdivided into elongated tubercles. Pin -rays 

 relatively slender, with distant articulations, smooth. Scales of 

 moderate size, those of the flank somewhat deeper than broad. 

 Scale-ornament consisting of prominent striae, somewhat oblique, 

 nearly straight and parallel, rarely bifurcating or intercalated ; 

 hinder margin serrated. 



Form. Sf Loc. Culm-Measures: North Devonshire. Millstone Grit: 

 Staffordshire and Yorkshire. Lower Coal-Measures : Staffordshire, 

 Derbyshire, and Lancashire. 



30577. Specimen wanting the greater part of the head, the paired 

 fins, and the extremity of the tail, in counterpart; 

 Dalemoor Eake Ironstone, Stanton-by-Dale, Derbyshire. 



Purchased, 1856. 



30579-80. Fragmentary remains of head and trunk, with pectoral 

 fin; Stanton-by-Dale. Purchased, 1856. 



P. 851. Fragment of squamation ; North Staffordshire. 



Egerton Coll. 



P. 6100. Well-preserved impression of head, lateral aspect, and 

 anterior scales; Culm-Measures, Instow, North Devon- 

 shire. Purchased, 1886. 



P. 6102. Imperfect head and anterior scales ; Instow. 



Purchased, 1886. 



