PAL^OKTSCIDJE. 
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. Pal<eo7iiscus longissimus, L. Agassiz, Poiss. Foss. vol. ii. pt, i. 
p. 100, pi. x. c. fig. 4. 
1850. Palceoniscus longissimus, W. King, Permian Foss. (Palseont. Soc.), 
p. 225, pi. xxi. fig. 2. 
Tyjje. 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. § Loc. Upper Permian : Durham and Northumberland. 
P. 1023. Counterpart of type specimen; Marl Slate, Clarence Bail- 
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. Enniskillen Coll. 
P. 1022. Impression of nearly complete fish, displaying the fins ; 
Marl Slate, "Whitley, Northumberland. Egerton Coll. 
Palaeonisens macrophthalmus, Agassiz. 
1835. Palceoniscus macrophthahnus, L. Agassiz, Poiss. Foss, vol. ii. pt. i. 
p. 99, pi. x. c. fig. 3. 
