8 
ICHTHXOTOMX. 
1880. Fleur acanthus pulchellus , J. W. Davis, loc. cit. vol. xxxvi. p. 327, 
pi. xii. fig. 2. 
1881. Anodontacanthus fastigiatu-s, J. W. Davis, loc. cit. vol. xxxvii. 
p. 428, pi. xxii. fig. 12. 
(P) 1881. Anodontacanthus obtusus, J. W. Davis, loc. cit. vol. xxxvii. 
p. 428, pi. xxii. fig. 11. 
1888. Pleuracanthus Icevissimus, R. H. Traquair, Geol. Mag. i'3] vol. v. 
p. 101. c L 
Type. Spine from S. Staffordshire Coal-Measures. 
Spine of adult fish attaining a maximum length of about 0*3 m., 
straight, compressed antero-posteriorly throughout the greater por¬ 
tion of its length, but with a median longitudinal angulation towards 
the distal extremity. Denticles placed laterally, of moderate size, 
very sharply pointed and reflexed. C\ e - K ■ \ > 
P. erectus , Davis, is evidently founded upon an abraded portion 
of a spine pertaining to this species. P.planus, Agassiz, is identical 
with P. pulchellus, Davis, and as there is no feature except size sepa¬ 
rating it from the typical P. Icevissimus , while intermediate forms in 
this respect are noted below, it cannot be regarded as distinct. 
Form. 6f Loc. Coal-Measures : Midlothian, Lanarkshire, Scotland ; 
Northumberland, Yorkshire, Staffordshire, England, 
41115. Crushed and abraded spine, 8 inches (0*23 m.) in length ; 
Dalkeith, Edinburgh. The worn extremity shows the 
characters of the so-called P. erectus. Purchased, 1868. 
33226-7, 36175. Fragments of spines ; Dalkeith. 
Purchased , 1857, 1862. 
P. 3027, P. 3027 a. One spine 0-255 m. in length, and the terminal 
half of a smaller example ; Dalkeith. Enniskillen Coll. 
P. 3178, st . 31/8a, P. 31/8b. Three incomplete large specimens; 
Dalkeith. The first spine is 0-35 m. in length ; in the 
second the rows of iateral denticles are more posteriorly 
situated than ordinarily. Enniskillen Coll. 
P . 3028. A much abraded imperfect spine ; Dalkeith, 
Enniskillen Coll. 
P. 1730. Fragments of spines, probably all of this species ; Cauden- 
foot, near Dalkeith. One is remarkable for the small size 
of the proximal lateral denticles. Egerton Coll. 
P> 1730 a. Portion of small spine having the lateral denticles placed 
far posteriorly, as in No. P. 3178 a ; Caudenfoot. 
Egerton Coll. 
