﻿346 CTtOSSOPTERYGTI. 



regarded as the type of a distinct species, Rhizodus anceps, J. S. 

 Newberry, Trans. New York Acad. Sci. vol. vii. (1888), p. 165, 

 and Paloeoz. Pishes N. America (Mon. U. S. Geol. Surv. no. xvi. 

 1889), p. 191, pi. xliii. fig. 1. 



An imperfect Rhizodont laniary tooth, perhaps of the same 

 species, from the same formation and locality, is theoretically 

 associated by Newberry with a fossil which appears to the present 

 writer to be the superficially calcified meckelian cartilage of an 

 Elasmobranch. These two specimens (in the Museum of Columbia 

 College) form the basis of a supposed genus Ccelosteus, J. S. New- 

 berry (Trans. New York Acad. Sci. vol. vi. 1887, p. 137), with the 

 single species, C.ferox (ibid., and Palaeoz. Pishes N. America, 1889, 

 p. 190, pi. xxxv. figs. 1-4). 



Rhizodus ornatus, Traquair. 

 [Plate XII. figs. 5-9.] 



1836. Megalichthys hibberti, Agassiz & Hibbert (errore), Trans. Roy. 



Soc. Edinb. vol. xiii. pi. viii. fig. 2 (scale). 

 1866. Rhizodus, J. Young, Quart. Journ. Geol. Soc. vol. xxii. p. 599 



(scales only). 

 1875. Rhizodus hibberti, R. H. Traquair (non Ag. & Hibb.), Ann. Mag. 



Nat. Hist. [4] vol. xv. p. 266. 

 1875. Rhizodus, L. C. Miall, Quart. Journ. Geol. Soc. vol. xxxi. p. 624, 



woodc. (inferior aspect of head, showing jugular plates). 

 1877. Rhizodus ornatus, R. H. Traquair, Proc, Roy. Soc. Edinb. vol.ix. 



p. 659. 



Type. Anterior portion of fish ; Edinburgh Museum. 



A species much smaller than R. hibberti. Head, opercular 

 and clavicular bones, and also scales, externally ornamented with 

 very coarse tuberculations, usually confluent into nodose, often 

 reticulating ridges. Clavicle and infraclavicle relatively narrower 

 antero-posteriorly than in R. hibberti, and the scales thicker. 



Form. $• Log. Calciferous Sandstones and Lower Carboniferous 

 Limestone Series : South Scotland. 



Unless otherwise stated, the following specimens were obtained 

 from the Blackband Ironstone (Lower Carboniferous Limestone) of 

 Gilmerton, near Edinburgh : — 



P. 3345. Head and anterior portion of trunk, viewed from the ventral 

 aspect. The mandible and portions of the jugular plates 

 and operculum exhibit the superficial ornamentation of 

 blunt tubercles and large, nodose, reticulating ridges ; while 



