P VL^OISTISCIDJE. 
437 
rz 
(1888), p. 252; J. Ward, Trans. N. Staffs. Inst. Mining 
Engin, vol, x. (1890), p. 178, pl.vi. fig. 11: Microconoclus 
molyneucci, B. H. Traquair, Ganoid Eishes Brit. Garb. Eorm. 
(Pal. Soc. 1877), p. 33 (name only).—Coal-Measures 
(Deep-mine Ironstone Shale); Longton. [Collection of 
J. Ward, Esq.] -dG - 
Gonatodus (?) toilliezi , L. G. de Ivoninck, Eaune Calc. Garb. Belg. 
pt. i. (1878), p. 11, pi. i. fi o' 5, ^ i * Pdccomsc , 
Beneden, Bull. Acad. Boy. Sci. Belg. [2] vol. xxxi. (1871), 
p. 515.—Upper Carboniferous Limestone ; Yiesville, Bel¬ 
gium. [Caudal and posterior abdominal region : l niversit.y 
of Louvain.] 
The following genus and species is stated to differ only from 
Gonatodus in the downward extension of the posterior expanded 
portion of the maxilla, and in the relatively large size of the 
splenial teeth :— 
Drydenius insignis , E. H. Traquair, Proc. Boy. Soc. Edinb. vol. 
xvii. (i890), p. 399.—Carboniferous Limestone (Black- 
band Ironstone); near Edinburgh. [Imperfect fish; 
Edinburgh Museum.] 
ten 
Genus AMBIalfPTERHS, Agassiz. 3 
TPoiss. Foss. vol. ii. pt. i. 1833, pp. 3, 28.] ;* • ^ 
c* ^ • • * l, 
Syp. Leiolepis, F. Goldenburg, Fauna Saimpontana Fossilis, 1873, p. 5. 
Trunk deeply fusiform ; mandibular suspensorium only slightly 
oblique; teeth minute. Fins large or of moderate size, with 
minute fulcra, the rays distally bifurcating; dorsal partly in advance 
of, partly opposing the anal; caudal fin powerful. Scales smooth, 
except sometimes in the anterior portion of the abdominal region, 
where they are more or less striated in their hinder half and serrated. 
This genus is adopted as amended by Troschel and Traquair. 
The species placed first in Agassiz’s description ( Palceoniscum macro- 
pterum of Bronff) does not agree with the published diagnosis in the 
nature of its dentition, and Amblypterus lotus is thus regarded as 
the type species. The striking resemblance between the scales 
of this fish and those of the Palaeoniscidse of Autun now assigned to 
Amblypterus , was already pointed out by Agassiz, tom. cit. p. 38. 
Amblypterus latus, Agassiz. 
1833. Amblypterus ledus, L. Agassiz. Poiss. Foss. vol. ii. pt. i. pp. 4, 37, 
pi. iv. figs. 2-6. 
