eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 137 



Galeichthys proops Jordan, Proc. U. S. Nat. Mus., IX, 1886, 559 (name only). 

 Tachisurus proops Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), 1, 1888, 



141 (Pernambuco) ; Occasional Papers Cal. Acad. Sci., I, 1890, 57. 

 Sciadeichthys proops Jordan and Evermann, Bull. U. S. Nat. Mus. No. 47, I, 



1896, 123. 



Several specimens, 245-680 mm. Georgetown market. (C. M. Cat. No. 

 1263, 1264, 1280; I. U. Cat. No. 11774.) 



I have also examined the specimens in the Leiden and Berlin Museums men- 

 tioned in the synonymy. 



Head 4-4.33; depth 7; D. 1,7; A. 18. Eye 1.25-1.5 in snout, 5.5-8 in head, 

 1.75-2.66 in the interorbital. 



Slender and elongate, broader than deep. Head depressed, its width 1.33 in 

 its length, its depth 2, width at mouth 2; anterior portion of the head flat above; 

 top of the head, humeral process, and dorsal plate coarsely granular, the granules 

 arranged in series along the fontanel. Occipital process mucronate, broader than 

 long; dorsal plate large, butterfly-shaped. Opercle striate; fontanel 1.5 times as 

 long as the eye, its center in front of the middle of the eye, continued as a shallow 

 groove. 



Jaws subequal; teeth all villiform, the intermaxillary band very wide and 

 shallow; teeth on the roof of the mouth in six contiguous patches. 



Gill-membranes meeting in an angle, forming a broad fold across the isthmus. 

 Gill-rakers 5 + 10. Pectoral pore large; vertical series of pores present. 



Distance of dorsal spine from snout 2.8 in the length; the dorsal spine granular 

 in front, striate on the sides, weakly serrate behind, its length 1.25-1.5 in the head. 

 Space between dorsal and adipose fins 2.75-3 in the length, the adipose fin little 

 shorter than the dorsal, the posterior margin free. Caudal deeply forked, its upper 

 lobe longer, 4-4.5 in the length. Anal emarginate, as high as long, 2-2.33 in the 

 head. Ventrals 2 in the head. Pectoral spine rough or granular in front, serrate 

 behind, 1.2-1.33 in the head. 



Plumbeous above, with blue lustre, white below; maxillary barbels dark, the 

 mental barbels white; fins all more or less dotted with brown. 



Abundant at Georgetown. The skull is prepared and sold in souvenir stores 

 as the " Crucifix Fish." 



17. Sciadeichthys parkeri (Traill). (Plate V, fig. 3.) 

 Silurus parkeri Traill, Mem. Wern. Soc, VI, 1832, 377, pi. 6, fig. 1 (muddy 

 water of rivers of Guiana). — Schomburgk, Fishes Brit. Guiana, I, 1843, 

 188 (Guiana). 



