ICHTHTOTOMI. 
1880. Fieuracanthus pulchelhts, J. W. Davis, he. cit. vol. xxxvi. p. 327, 
pi. xii. fig. 2. 
1881. Anodemtacanthua faatigiatus, J. W. Davis, he. cit. vol. xxxvii. 
p. 428, pi. xxii. fig. 12.J 
(?) 1881. Anodontacanthua obtusua, J. W. Davis, he. cit. vol. xxxvii. 
p. 428, pi. xxii. fig. 11. 
1888. Fieuracanthus leevissimus, R. II. Traquair, Geol. Mag. [3] vol. v. 
p. 101. 
Type. Spine from 8. Staffordshire Coal-Measures. 
Spine of adult fish attaining a maximum length of about 0-3 m., 
straight, compressed antoro-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. 
P. erectus, Davis, is evidently founded upon an abraded portion 
of a spine pertaining to this species. P. planus, Agassiz, is identical 
with P. pulcJidlus, Davis, and as there is no feature except size sepa- 
rating it from the typical P. lawissimus, while intermediate forms in 
this respect are noted below, it cannot bo regarded as distinct. 
Form. ^ 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 spino 0’255 m. in length, and the terminal 
half of a smaller example; Dalkeith. Enniskillen Coll. 
P. 3178, P. 3178a, P. 3178b. Three incomplete largo specimens; 
Dalkeith. The first spine is 0'35 m. in length ; in the 
second the rows of lateral 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. Fjgerton Coll. 
P. 1730 a. Portion of small spine having the lateral denticles placed 
far posteriorly, as in No. P. 3178 a ; Caudenfoot. 
Egerton Coll. 
