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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 52 



traceable anteriorly as a narrow streak or faint ridge on nearly all 

 our specimens. Size small, the length about 6 inches. Of this 

 species we have fragments of five individuals (Nos. 8, 9, 16, 17, 

 Rocha Collection), besides a geodized trunk (Pessoa Collection) 





Fig. 12. — Rliacolepis buccalis Agassiz. 

 Barra do Jardim. The head restored after Woodward. 



filled with quartz crystal, more or less telescoped, showing the scales 

 well, but without head or fins. This specimen shows no trace of 

 ventral fins, although the belly is completely preserved. In most of 



Fig. 13. — Rhacolcpis buccalis Agassiz. Ceara. Top of head. 



these specimens the substance under the scales is jet black. This is 

 apparently due to the presence of the original pigment, in which case 

 we may assume that the fish itself was black in life. 



The plate or sheath-like projection above the opercle, more or less 

 developed in all the Elopidse, is very distinct in this species. 



8. RHACOLEPIS LATUS Agassiz 



Plate VI, Fig. 3 

 Rhacolcpis latiis Agassiz, Edinburgli Phil. Jouni. xxx, p. 83, 1841 ; Cre- 

 taceous of Ceara. 

 Rhacolcpis latus Agassiz, Comptes Rendus, xviii, p. 1012, 1844; Ceara. 

 Agassiz, Poiss. Fossiles, iv, p. 293, 1844; Ceara. 

 Woodward, Proc. Z06I. Soc, London, 1887, p. 539, pi. xu'ii, fig. 5; 



Ceara. 

 Woodward, Cat. Fossil Fishes, iv, 1901, p. 322; Ceara. 



