490 
ACTLXOPTEKYGII. 
of the head and tail, displaying the sqnamation 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. 
Ulonichthys aitkeni ? . Traquair. 
1874. Acrolepis , J. Aitken, Trans. Manchester Geol. Soc. vol. xiii. 
p. 36. 
1886. Elonichtliys aitkeni, It. H. Traquair, Geol. Mag. [3] vol. iii. 
p. 440. 
1890. Elonichtliys aitkeni, J. Ward, Trans. N. Staffs. Inst. Mining 
Engin. p. 174, pi. vi. figs. 9,12. 
Type. Imperfect fish ; olini 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. Fin-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 Log. 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 Hake 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. 
