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376 CROSSOPTERYGII. 



1 8 4 8. Qyroptychius diplopteroides, F. M'Coy, ibid. p. 309. [Wood- 



wardian Museum.] 

 1849. Diplopterus, H. Miller, Footprints of the Creator, p. 57, woodc. 



figs. 16, 17. 

 1855. Diplopterax affinis and D. agassizii, F. M'Cov, Brit. Palseoz. Foss. 



p. 586. 

 1855. Diplopterax gracilis, F. M'Coy, ibid. p. 586, pi. ii. c. fig. 1. 

 1855. Diplopterax macrolepidotus, F. M'Coy, ibid. p. 587 (in part). 

 1855. Gyroptychius diphpteroides, F. M'Coy, ibid. p. 597, pi. ii. c. fig. 3. 

 1860. Diplopterax borealis, C. H. Pander, Saurodipt., Dendrodont. &c. 



devon. Syst. p. 23, pi. iii. figs. 22-27, pi. iv. 

 1888. Diplopterus agassizii, R. H. Traquair, Geol. Mag. [3] vol. v. 



p. 516. 

 1890. Diplopterus agassizii, R. H. Traquair, Ann. Mag. Nat. Hist. [6] 



vol. vi. p. 484, woodc. fig. 3. 



Type. Imperfect fish ; olim T. S. Traill Collection. 



The type species, attaining a large size, sometimes measuring 0*5 

 in length. Head with opercular apparatus occupying somewhat 

 less than one quarter of the total length ; operculum deeper than 

 broad, suboperculum smaller and broader than deep. Pelvic fins 

 situated far behind the middle point of the fish ; first dorsal fin 

 much smaller than the second, the latter deeper than long and 

 similar in all respects to the opposing anal; caudal fin obtusely 

 pointed posteriorly, the origin of its upper lobe precisely opposite to 

 that of the lower, and the distance from this point to the origin of 

 the first dorsal greater than the total length of the fin. Scales 

 relatively large. 



Form. Sf hoc. Lower Old Red Sandstone : Orkney, Caithness, 

 Nairnshire, and Banffshire \ 



(i.) Orkney (typical D. agassizi). 



P. 183. Large well-preserved specimen, in counterpart, 0*42 in 

 length, wanting the dorsal fins and showing only portions 

 of the pelvics and anal. Purchased, 1881. 



P. 3294-a. Two smaller specimens, showing portions of all the 

 fins ; Belyacreugh. Eiinislrillen Coll. 



29252 a. Fish 0-29 in length, displaying the fins, but with imper- 

 fect head. Purchased. 



P 821. Fronto-ethmoidal portion of cranial shield. Egerton Coll. 



1 The so-called Diplopterus macrocephalus is also supposed to be represented 

 by fragments from the Eussian Devonian by L. Agassiz, Poiss. Foss. V. G. B. 

 (1845), p. 138, pi. xxxi. a. figs. 1-7, and E. von Eichwald, Letb. Eossiea. 

 vol, i. (1860), p. 1556, pi. Ivi. fig. 5. 



