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36S CROSSOrTEEYGII. 



Genus OSTEOLEPIS, Valenciennes. 



[Trans. Geol. Soc. [2] vol. iii. 1829, p. 144.] 



Syn. Pleiopterus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 1835, p. 113. 

 Tripterus, F. M'Coy (won Quoy & Gaimard, 1824), Ann. Mag. 



Nat. Hist. [2] vol. ii. 1848, p. 306. 

 Triplopterus, F. M'Coy, Brit. Paheoz. Foss. 1855, p. 589. 



Cranial roof-bones in advance of the parietals usually fused into 

 a continuous shield, with a median frontal foramen ; an anterior 

 median jugular plate present. Teeth rounded in transverse section. 

 Ossified ring-shaped vertebrae in the abdominal region. First dorsal 

 fin in advance of the pelvic pair, and the second dorsal opposed to 

 the space between the pelvics and the anal. Tail strongly hetero- 

 cercal ; caudal fin obliquely truncated posteriorly. Scales smooth, 

 punctate. 



The most elaborate description of this genus is that of C. H. 

 Pander (Saurodipt., Dendrodont. &c. devon. Syst. 1860). Good 

 figures of the head had previously been published by Hugh Miller, 

 " Footprints of the Creator " (1849), p. 51, figs. 12-15. 



Osteolepis macrolepidotus, Agassiz. 

 [Plate XIII. fig. 1.] 



(?) 1829. Osteolepis macrolepidotus, A. Valenciennes, Trans. Geol. Soc. 



[2] vol. iii. p. 144. 

 1835. Osteolepis macrolepidotus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 



p. 119, pi. ii. h. figs. 1-4, pi. ii. c. figs. 5, 6. 

 1835. Osteolepis ?nicrolep>idotus, L. Agassiz, ibid. p. 121, pi. ii. c. figs. 



1-4. 

 1835. Osteolepis arenatus, L. Agassiz, ibid. p. 122, pi. ii. d. figs. 1-4. 



[British Museum.] 

 1841. Osteolepis, H. Miller, Old Ked Sandstone, p. 72, pi. iv. 

 1844. Osteolepis major, L. Agassiz, Poiss. Foss. V. G. R. pp. 49, 51, 



pi. xix. figs. 1-3. [British Museum.] 

 1848. Osteolepis brevis; F. M'Coy, Ann. Mag. Nat. Hist, [2] vol. ii. 



p. 305. [Woodwardian Museum, Cambridge.] 

 1848. Tripterus pollexfeni, F. M'Coy, ibid. p. 306. [Caudal region ; 



"Woodwardian Museum.] 

 1855. Osteolepis arenatus, O. macrolepidotus, O. major, and O. micro- 



lepidotus, F. M'Coy, Brit. Palseoz. Foss. pp. 587, 588. 

 1855. Osteolepis brevis, F. M'Coy, ibid. p. 587, pi. ii. d. fig. 4. 

 1855. Triplopterus pollexfeni, F. M'Coy, ibid. p. 589, pi. ii. d. fig. 5. 

 1860. Osteolepis macrolepidotus, C. H. Pander, Saurodipt., Dendrodont. 



&c. devon. Syst. pp. 2 (in part), 7, pi. ii. figs. 2, 6-9, pi. iii. figs. 



