f 
ACTINOPTERYGII. 
466 
Type. Imperfect fish. 
A small robust species, attaining a length of about 0*08. Maxi¬ 
mum depth of trunk contained about four times in the total 
length. Head relatively small, and external bones coarsely striated. 
Dorsal fin arising slightly in advance of the anal, and the latter 
much elongated. A continuous series of enlarged ridge-scales from 
the dorsal fin to the occiput; flank-scales as broad as deep ; scale- 
ornament consisting of irregular transverse striae, more or less 
oblique, terminating in coarse blunt serrations of the hinder border. 
Form. Sf Log. Lower Carboniferous : Albert Co., New Brunswick. 
P. 1010. Imperfect specimen, wanting the upper caudal lobe; 
Hillsborough. Egerton Coll. 
P. 5193-4. Remains of a group of fishes, and three detached 
specimens displaying the squamation ; Hillsborough. 
Purchased , 1885. 
Rhadinichthys modulus (Dawson). 
1877-78. Palceoniscus ( Rhadinichthys) modulus, J. W. Dawson, Canadian 
Nat. n. s. vol. viii. p. 337, woodc. fig. 1, and Acadian Geology, 
Suppl. p. 100, woodc. fig. 18. 
Type. Imperfect fish ; Peter Redpath Museum, Montreal. 
A species closely related to P. alberti , described as distinguished 
by its relatively shorter anal fin, the coarseness of the scale- 
ornament, and the truncation of the dorsal ridge-scales. The last- 
mentioned character may be a false appearance. 
Form. <Sf Log. Lower Carboniferous: Albert Co., New Brunswick. 
P. 6219. Two specimens, wanting the head ; Petitcodiac River. 
Presented by Sir J. William Dawson , 1890. 
Rhadinichthys tenuieauda 9 Traquair. 
1877. Rhadinichthys tenuicauda, R. H. Traquair, Proc. Roy. Soc. 
Edinb. vol. ix. p. 443. 
Tijpe. Fish; Edinburgh Museum. 
A small species, attaining a length of about 0-08. Body very 
slender and elongated, narrowly tapering posteriorly. Head-bones 
finely ornamented with vermiculating striae. Fin-rays delicate, 
smooth, with distant articulations; dorsal and anal fins almost 
completely opposed, considerably in advance of the caudal fin. 
Beales relatively large, posteriorly serrated, nearly smooth on the 
