DTPIERID-E. 
243 
Chemung Group of Ithaca, New York State, is named Dipterus 
ithacensis , H. S. Williams, Proc. Amer. Assoc. Adv. Sci. vol. xxx. 
(1881), p. 193. 
Genus PALLIDAPHUS } P. J. Van Beneden & L. G. 
de Koninck. 
[Bull. Acad. Boy. Belg. [2] vol. xvii. 1864, p. 150.] 
Syn. Heliodus, J. S. Newberry, Bep. Geol. Surv. Ohio, vol. ii. pt. ii. 
1875, p. 62. 
A provisional genus at present incapable of definition, comprising 
very large Palaeozoic Dipnoan fishes, in which the anterior portion 
of the mandible resembles in shape that of Dipterus. 
Palaedaphus insignis, Van Beueden A de Ivoninck. 
1864. Palcedaphus insignis , P. J. Van Beneden & L. G. de Koninck, 
Bull. Acad. Boy. Belg. [2] vol. xvii. p. 143, pis. i., ii. 
1871. Palaedaphus insignis, A. Giinther, Phil. Trans, p. 557. 
1875. Palcedaphus insignis , J. S. Newberry, Bep. Geol. Surv. Ohio, 
vol. ii. pt. ii. p. 63. 
1878. Palcedaphus insignis , B. II. Traquair, Ann. Mag. Nat. Hist. [5] 
vol. ii. p. 12, pi. iii. figs. 5-7. 
1888. Palcedaphus insignis, A. Fritsch, Fauna der Gaskolile, vol. ii. 
p. 88, fig. 167. 
Type. Anterior half of mandible with dental plates ; Museum, 
University of Liege. 
The type species. Mandibular dental plates attaining a length of 
about 0*13, with four rounded, widely-spaced, coronal ridges, scarcely' 
radiating. 
Form. Toe. Upper Devonian : Belgium. 
43603. Plaster cast of type specimen, shown, one sixth nat. size, 
in woodc. fig. 36 (4), p. 234 ; Huy. Purchased , 1872. 
Palaedaphus devoniensis, Van Beneden. 
1869. Palcedaphus devoniensis, P. J. Van Beneden, Bull. Acad. Boy. 
Belg. [2] vol. xxvii. p. 378, with plate. 
1875. Heliodus devoniensis , J. S. Newberry, Bep. Geol. Surv. Ohio, 
vol. ii. pt. ii. p. 63. 
1878. Palcedaphus devoniensis, B. H. Traquair, Ann. Mag. Nat. Hist. 
[5] vol. ii. p. 15. 
1888. Palcedaphus devoniensis, A. Fritsch, Fauna der Gaskolile, vol. ii. 
p. 89, fig. 168. 
