﻿2'3l\ SIREN01DEI. 



is given by C. H. Pander ] and It. H. Traquair 2 ; and all the known 

 species are of small size. 



Dipterus valenciennesi, Sedgwick & Murchison. 



1828. Dipterus valenciennesii, A. Sedgwick & R. I. Murchison, Trans. 



Geol. Soc. [2] vol. iii. p. 143, pi. xvi. figs. 1-3. 

 1828. Dipterus macropygopterus, Sedgwick & Murchison, ibid. p. 143, 



pi. xv. figs. 1-3. [Mus. Geological Society of London.] 

 1828. Dipterus brachypygopterus, Sedgwick & Murchison, ibid. p. 143, 



pi. xvii. figs. 1-3. 

 1833. Catopterus analis, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 3. 

 1835. Dipterus macrolepidotus, L. Agassiz, ibid. p. 115, pi. ii. figs. 1-3, 



pi. ii. a. figs. 1-5. 

 1841. Dipterus, H. Miller, Old Red Sandstone, p. 79, pi. v. fig. 1. 

 1844. Pol yphr actus platycephalus, L. Agassiz, Poiss. Foss. V. G. R. 



pp. 5, 29, pi. xxvii. fig. 1, pi. xxxi. fig. 5. [Cranial shield ; British 



Museum.] 

 1844. Megalichthys priscus, L. Agassiz, Poiss. Foss. vol. i. p. xxxiv 



(name only). 

 1849. Dipterus, II. Miller, Footprints of the Creator, p. 59, figs. 18-22. 

 1855. Dipterus brachypygopterus, D. macropygopterus, and D. valen- 

 ciennesii, F. M-Coy, Brit. Paheoz. Foss. p. 592. 

 1858. Dipterus valenciennesii, C. H. Pander, Ctenodipt. devon. Syst. 



p. 6, pi. i. figs. 1-4, 8, pi. ii. figs. 1, 6, 7. 

 1858. Dipterus platycephalus, C. H. Pander, ibid. p. 7, pi. i. fig. 5, pi. ii. 



figs.^2, 9, pi. iii., pi. iv. figs. 23, 27, pi. v. figs. 15-19. pi. vii. tigs. 



5, 11. 

 18G1. T)ipterus, T. H. Huxley, Figs. & Descrips. Brit. Organic Remains 



(Mem. Geol. Surv.), dec. x. p. 14, fig. 10, woode. 

 1871. Dipterus, A. Gunther, Phil. Trans, p. 556, pi. xxxiv. fig. 4. 

 1878. Dipterus, R. II. Traquair, Ann. Mag. Nat. Hist. [5] vol. ii. p. 1, 



pi. iii. figs. 1-4. 

 1888. Dipterus valenciennesii, R. H. Traquair, Geol. Mag. [3] vol. v. 



p. 507. 



Type. Imperfect fishes ; Geological Society of London. 



The type species, attaining a length of not less than 0*4. Head 

 with opercular apparatus occupying somewhat more than one fifth 

 of the total length; cranial shield very slightly tapering forwards, 

 its maximum breadth at the occiput equalling about | its total length, 

 and the snout abruptly truncated, with rounded lateral angles ; 

 operculum trapezoidal, with slightly convex borders, as deep as 

 broad ; tuberculations of dental plates large, well separated, laterallv/ 



1 Ueber die Ctenodipterinen des devonischen Systems, 1858, pp. 6-21, with 

 plates. 



3 Ann. Mag. Nat. Hist. [5] vol. ii. (1878), pp. 1-12, pi. iii. figs. 1-4. 



