﻿PALJEOITCSCID^. 437 



(1888), p. 252 ; J. Ward, Trans. N". Staffs. Inst. Mining 

 Engim vol, x. (1890), p. 178, pl.vi. fig. 11 : Microconodus 

 molyneuxi, R. H. Traquair, Ganoid Fishes Brit. Carb. Form. 

 (Pal. Soc. 1877), p. 33 (name only). — Coal-Measures 

 (Deep-mine Ironstone Shale) ; Longton. [Collection of 

 J. Ward, Esq.] 

 Gonatodus (?) toittiezi, L. G. de Koninck, Faune Calc. Carb. Belg. 

 pt. i. (1878), p. 11, pi. i. figs. 1, 2 : Palaoniscus, P. J. Van 

 Beneden, Bull. Acad. Roy. Sci. Belg. [2] vol. xxxi. (1871), 

 p. 515. — Upper Carboniferous Limestone ; Yiesville, Bel- 

 gium. [Caudal and posterior abdominal region : University 

 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, R. H. Traquair, Proc. Roy. Soc. Edinb. vol. 

 xvii. (1890), p. 399. — Carboniferous Limestone (Black- 

 band Ironstone) ; near Edinburgh. [Imperfect fish ; 

 Edinburgh Museum.] 



Genus AMBLYPTERUS, Agassiz. 

 [Poiss. Foss. vol. ii. pt. i. 1833, pp. 3, 28.] 

 Syn. Leiolepis, F. Goldenburg, Fauna Saraepontana 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 Bronn) does not agree with the published diagnosis in the 

 nature of its dentition, and Amblypterus latus 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, torn. cit. p. 38. 



Amblypterus latus, Agassiz. 



1833. Amblypterus latus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. pp. 4, 37, 

 pi. iv. figs. 2-6. 



