l6 SMITHSOXTAN MISCELLAXEOUS COLLECTTOXS VOL. 52 



Genus CALAMOPLEURUS Agassiz 



Cahnnuplcurus Agassiz, Edinburgli Joiirn. xxx. 1S41, p. 84; type, Cala- 

 niflplcitrus cylindricus Ac.assiz. 



Agassiz characterizes the fragments on which this genns is based 

 by the following characters : *' 



"he long tube etroit des ecailles de la ligne laterale, et par I'uni- 

 formite de ses ecailles arrondies." To this Woodward (499) adds 

 the following, based on a specimen in the British ]\Iuseum : "The 

 scales are cycloidal, very much imbricated, and ap])arently longer 

 than deep; the fin-rays are widely spaced and much divided distally." 



A fine, large specimen in counterpart, from Ceara, shows the lat- 

 eral line with well-developed tubes, and the scales equal, cycloid, and 

 closely imbricated. As the species is one not specifically recognized 

 by Woodward and as it is from Agassiz's original locality, we ven- 

 ture to identify it with Agassiz's unrecognized Calamoplcurns cylin- 

 driciis. 



The genus Calamoplcurus, as understood by us, belongs to the 

 Elopidse, differing from Notelops in the well-developed lateral line 

 and in the small teeth, and from Blops in the more posterior insertion 

 of the ventrals and in the less elongate form. Mouth large, the jaws 

 subequal, the gape oblique, extending beyond the eye ; teeth even, 

 pointed, small, less than one-fifteenth the diameter of the eye ; two 

 large, oblong, parallel postorbital bones ; below these a large trape- 

 zoidal cheek-plate, broadest posteriorly ; two parallel postorbital 

 bones above this ; subopercle very broad, its depth rather more than 

 half that of the opercle. Scales cycloid, closely imbricated, the indi- 

 vidual scales a little longer than deep ; a sheath of scales at base of 

 dorsal, as in Blops; a sheathing projection on occiput and one above 

 opercle; lateral line well developed, nearly straight and median, its 

 tubes simple and straight ; dorsal short, median, inserted at a distance 

 behind gill opening about equal to depth of body ventrals ; inserted 

 under or perhaps behind last ray of dorsal ; moderate ; caudal well 

 forked, its base closely scaly nearly to the tips of the median rays. 



4. CALAMOPLEURUS CYLINDRICUS Agassiz 



Pl.\tes TII, IV 



Cahnnopleiiriis cylindriciis Agassiz, Edinburgh Journ. xxx. 1841 ; Ceara. 

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

 Woodward, Cat. Fossil Fishes, iii, p. 499, 1894. 

 Jordan, Bull. Cal. Univ., 1907, p. 139, pi. 12 ; Ceara. 



We refer to this species the large specimen above mentioned. It 

 is about 15 inches long. It was presented by Dr. Paula Pes.soa, of 



