26 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 52 



Family CHIROCEXTRID^ ( ?) 

 Genus CLADOCYCLUS Agassiz 



Cladocyclus Agassiz, Edinburgh Phil. Journ., xxx, 1841, p. 83; type. 



Cladocyclus gardneri Agassiz. 

 Ancedopogon Cope, Proc. Am. Phil. Soc, xii, 1871, p. 53; type, Aruedo- 



pogon tenuidens Cope. 



This genus is notable for its large scales. The teeth are said to be 

 small and nearly uniform. 



ID. CLADOCYCLUS GARDNERI Agassiz 



Plate VIII, Fig. i 



Cladocyclus gardneri Agassiz, Edinburgh Phil. Journ., xxx, p. 83, 1841 ; 

 Cretaceous of Ceara. 



Agassiz, Poiss. Fossiles, v, pi. i, pp. 8, 103. 1844; Ceara. 



Agassiz, Comptes Rendus, xviii, p. 103, 1844. 



Woodward, Cat. Fossil Fishes, iv, 190 1, p. 108, pi. 9, fig. i ; Ceara. 

 Ancedopogon tenuidens Cope, Proc. Am. Phil. Soc, xii, 1871, p. 53; Ceara. 



We refer to this species a piece of a broken nodule (No. 26, Rocha 

 ■^?^- ^/^£»--^ Collection), showing a cast of 



part of the side of a very large 

 fi.sh. It shows little except 

 that the scales are very large. 

 ^^^^ about half an inch in diameter, 



with uneven or pustulose sur- 



FiG. 18. — Species unknown. Barra do 

 Jardim. Perhaps Cladocyclus gardneri. 



FiG. 19. — Scale of Cla- 

 docyclus gardneri. 

 Ceara, Brazil. 



face and edges. No trace of lateral line. We follow Woodward in 

 referring the genus Cladocyclus to the Chirocentridae. 



Besides this specimen we have also a fragment of the caudal por- 

 tion of the backbone of some unknown species (No. 30, Rocha Col- 

 lection), possibly Cladocyclus gardneri. The fragment is remarkable 

 for the regular rhombic form of the interspaces between the vertebrae 

 and for the extreme narrowness of the centrum of f^ach vertebra as 

 seen in section. 



