EIGENMANN: the freshwater fishes of BRITISH GUIANA 473 



Diplolepis squamosissimus Steindachner, " Scisenoiden Brasiliens," etc., in SB. 



Akad. Wiss. Wien, XLI, 1863, 2. 

 Scicena rubella Schomburgk, Fishes Brit. Guiana, II, 1843, 133 (rivers of Guiana). 

 Johnius crouvina Castelnau, Anim. Am. Sud, Poiss., 1855, 11, pi. 5, fig. 1 (Rio 



Crixas; Rio Araguay). 

 Scicena crouvina Gunther, Catalogue, II, 1860, 287 (copied). 

 Johnius amazonicus Castelnau, Anim. Am. Sud, Poiss., 1855, 12, pi. 4. fig. 1 



(Amazon). 

 Sciwna amazoyiica Gunther, Catalogue, II, 1860, 284 (Rio Capin, Para). 

 ? Corvina monacantha Cope, Trans. Am. Philos. Soc, XIII, 1866, 402 (near Para- 

 maribo, Dutch Guiana). 

 ? Scicena monacantha Jordan, Proc. U. S. Nat. Mus., IX, 1886, 587 (name only). 

 One specimen, 570 mm. Falls of the Mazaruni. (C. M. Cat. No. 2493a.) 

 Head 3.1; depth 3.2; D. X-I,29-36; A. 11,5-7; scales with pores about 50, 

 with about one hundred oblique series above the lateral line; eye 5.5 in the head; 

 interorbital a little larger than the eye, 4.5 in the head. 



Head at the base of the occipital process 1.2 in the greatest dei)th. Snout 

 moderately short, 4.5-5 in the head. Mouth large, upper end of the maxillary 

 on the level of the lower margin of the eye. Maxillary 2.3 in the head, reaching 

 to just beyond the eye. Teeth of the upper jaw about equal to those of the inner 

 series of the lower jaw. Gill-rakers rather long, 10 + 12. Pseudobranchise small 

 or lacking on one side. Scales ctenoid. Soft dorsal and caudal all but covered 

 with scales; caudal convex. Pectorals longer than the ventrals, 1.6 in the head. 

 Ventrals without elongate filamentous tips in this large specimen. Second anal 

 spine inconsiderable, very little longer than the eye, 4.5-5.5 in the head. Anal 

 small. 



Silvery, darker above; a large dark spot in the axil, prolonged obliquely down- 

 ward and backward to beneath the ventrals. Dorsals, caudal, and proximal half 

 of the pectorals dark. 



Stellifer Cuvier. 



"Les SteUiferes" Cuvier, Regne Animal, ed. 1, 1817, 283. 



Stellifer {ex Cuvier) Oken, Isis, 1817, 1182 {stellifer). 



Stelliferus Stark, "Elements Nat. Hist., I, 459, 1828" {stellifer) {fide Gill). 



Hamoprion Holbrook, Ichth. South Carolina, ed. 1, 1856, 188 {lanceolata) . 



Type, Bodianus stellifer Bloch. 



The genus is characterized, as indicated in the key to the genera, by a remarkably 

 spongy and cavernous structure of the bones of the head ; the septa are very thin. 



