﻿PAL^ONTSCIDJS. 483 



1341 (Sloane Cat.). Crushed remains of a coiled-up individual, in 

 counterpart. Sloane Coll. 



1337-39 (Sloane Cat.). Three fragmentary specimens, in counter- 

 part. Sloane Coll. 



Palseoniscus longissimus, Agassiz. 



1835. Palteoniscus longissimus, L. Agassiz, Poiss. Foss. vol. ii. pt, i. 



p. 100, pi. x. c. fig. 4. 

 1850. Palcsoniscus longissimus, W. King, Permian Foss. (Palaaont. Soc), 



p. 225, pi. xxi. fig. 2. 



Type. Imperfect fish, wanting the greater part of the head; 

 British Museum (in part). 



Trunk narrow and elongated, the greatest depth contained about 

 six and a half times in the total length, which rarely exceeds 0*2. 

 Head and opercular apparatus occupying somewhat less than one- 

 fourth of the total length ; cranial bones marked with coarse rugae 

 and elongated tubercles of ganoine, apparently more sparsely arranged 

 than in P. freieslebeni. Fin-rays broad. Pelvic fins situated much 

 nearer to the anal than to the pectoral pair, arising immediately in 

 advance of the origin of the dorsal ; dorsal fin somewhat longer than 

 high, twice as large as the anal. Scales of moderate size, with a 

 prominent ornamentation of short transverse grooves and elongated 

 pittings. 



Form. Sf Log. Upper Permian : Durham and Northumberland. 



P. 1023. Counterpart of type specimen; Marl Slate, Clarence Rail- 

 way cutting, near Mainsforth, Durham. Egerton Coll. 



28613 C. Small imperfectly preserved trunk ; Marl Slate, Midderidge, 

 Durham. Purchased, 1853. 



43268-69. Two typical specimens ; Midderidge. 



Purchased, 1871. 



P. 3473. Vertically crushed head and trunk, wanting the extremity 

 of the tail; Midderidge. EnnisJcillen Coll. 



P. 1022. Impression of nearly complete fish, displaying the fins ; 

 Marl Slate, Whitley, Northumberland. Egerton Coll. 



Palaeoniscus macrophthalmus, 



1835. Palceoniscus macrophthalmus, L. Agassiz, Poiss. Foss, vol. ii. pt. i. 

 p. 99, pi. x. c. fig. 3. 



2i2 



