338 
GROSSO PTERYGII. 
have been described under the generic names of Dendroclus (E. 
Owen, Microscopic Journal, vol. i. 1841, p. 4) and Lamnodus 
(L. Agassiz, Poiss. Foss. V. G. E. 1844, pp. 61, 83). They have also 
received the following specific names :— 
Dendrodus biporcatus, Owen. 
1839. Tooth of Megalichthys or Holoptychus ?, E. I. Murchison, 
Silurian System, p. 600, pi. ii. bis. figs. 8, 9. 
1841. Dendrodus biporcatus, E. Owen, Microscopic Journal, vol. i. 
p. 5, woodc. figs. 1, 2, p. 19, woodc. fig. 5. 
1841. Dendrodus compressus, E. Owen, ibid. p. 17, woodc. fig. 3. 
1841. Dendrodus biporcatus, E. Owen, Odontogr. p. 171, pi. lxii. a. 
fig. 1, pi. lxii. b. 
1841. Dendrodus hastatus, E. Owen, ibid. p. 175. 
1841. Tooth of Holoptychius, H. Miller, Old Eed 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 panderi, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 162 
(name only). 
1844. Lamnodus biporcatus, L. Agassiz, Poiss. Foss. V. G. E. 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, Il¬ 
ls. 
1845. Lamnodus sulcatus, L. Agassiz, ibid. p. 145, pi. xxviii. a. fig. 18. 
1860. Dendrodus biporcatus, 0. H. Pander, Saurodipt., Dendrodont. 
&c. devon. Syst. p. 53, pi. x. figs. 8-13,17, 18. 
1860. Dendrodus biporcatus, E. von Eicliwald, Leth. Eossica, vol. i. 
p. 1559. 
1880. Dejidrodus biporcatus , H. Trautschold, Verhandl. russ.-kais. 
mineral/ Ges. St. Petersburg, [2] vol. xv. p. 139, pis. iii.-v. 
1889. Dendrodus biporcatus, J. V. Eohon, 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 Holopty chius 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, Loc. Fpper Old Eed Sandstone: Elgin. Devonian : 
JEW. Eussia. 
