﻿338 CR0SS0PTERYGI1. 



have been described under the generic names of Dendrodus (R. 

 Owen, Microscopic Journal, vol. i. 1841, p. 4) and Lamnodus 

 (L. Agassiz, Poiss. Foss. Y. G. R. 1844, pp. 61, 83). They have also 

 received the following specific names : — 



Dendrodus biporcatus, Owen. 



1839. Tooth of Megalichthys or Holoptychus? , R. I. Murckison, 



Silurian System, p. 600, pi. ii. bis. figs. 8, 9. 

 1841. Dendrodus biporcatus, R. Owen, Microscopic Journal, vol. i. 



p. 5, woodc. figs. 1, 2, p. 19, woodc. fig. 5. 

 1841. Dendrodus compressus, R. Owen, ibid. p. 17, woodc. fig. 3. 

 1841. Dendrodus biporcatus, R. Owen, Odontogr. p. 171, pi. Mi. a. 



fig. 1, pi. lxii. b. 

 1841. Dendrodus hastatus, R. Owen, ibid. p. 175. 



1841. Tooth of Holoptychius, H. Miller, Old Red Sandstone, p. xxiii, 

 pi. ix. fig. 4. 



1842. Dendrodus biporcatus, P. Duff, Geol. Moray, p. 67, pi. vi. fig. 5. 

 1842. Dendrodus latus, P. Duff, ibid. p. 67, pi. vi. fig. 4. 



1842. Dendrodus compressus, P. Duff, ibid. p. 67, pi. vi. fig. 7. 



1844. Lamnodus pandeii, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 162 



(name only). 

 1844. Lamnodus biporcatus, L. Agassiz, Poiss. Foss. V. G. R. pp. 61, 



84, 144, pi. C. figs. 7-9, 14-19, pi. xxviii. figs. 6, 7, pi. xxviii. a. 



figs. 14, 15. 

 1844. Lamnodus panderi, L. Agassiz, ibid. p. 61. 



1844. Dendrodus latus, L. Agassiz, ibid. pp. 61, 82, pi. xxviii. figs. 1, 2. 



1845. Lamnodus hastatus, L. Agassiz, ibid. p. 87, pi. C. figs. 1-6, 11- 

 13. 



1845. Lamnodus sulcatus, L. Agassiz, ibid. p. 145, pi. xxviii. a. fig. 18. 

 1860. Dendrodus biporcatus, C. H. Pander, Saurodipt, Dendrodont. 



&c. devon. Syst. p. 53, pi. x. figs. 8-13, 17, 18. 

 1860. Dendrodus biporcatus, E. von Eichwald, Leth. Rossica, vol. i. 



p. 1559. 

 1880. Dendrodus biporcatus, H. Trautschold, Verhandl. russ.-kais. 



mineral. Ges. St. Petersburg, [2] vol. xv. p. 139, pis. iii.-v. 

 1889. Dendrodus biporcatus, J. V. Rohon, Mem. Acad. Imp. Sci. St. 



Petersbourg, [7] vol. xxxvi. no. 14, p. 28, pi. i. fig. 2. 



Type. Detached teeth. 



The type species both of Dendrodus and Lamnodus, probably 

 founded upon the dentition of Holoptychius giganteus. Teeth 

 robust, straight or gently curved, attaining a large size ; round or 

 oval in section in the basal portion, laterally compressed above, with 

 a prominent pair of opposite longitudinal keels. 



Form, fy Loc. Upper Old Red Sandstone : Elgin. Devonian : 

 N.W. Russia. 



