382 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [40] 
37. PLAGIOSCION SQUAMOSISSIMUS. 
Sciena squamosissing Heckel, Annalen des Wiener Museum, ii, 438, 1840. Reinhardt, 
Videnskab. Medd. Naturhist. Forening Kjébenhavn, 108,1854. Steindachner, 
Beitr. zur Kenntniss der Fisch-Fauna Siid-America’s, 1879, 3 (Amazon, Ori- 
noco, Rio Negro). 
Pachyurus squamosissimus Giinther, Cat. Fish. Brit. Mus., ii, 526, 1860 (copied). 
Diplolepis squamosissimus Steindachner, Scien. Brasil., 2, 1863 (Brazil). 
? Sciena rubella Schomburgk, Naturalists’ Library, Fishes of Guiana, ii, 133, 1843 
(Rivers of Guiana). (D. IX, 34; A. II, 6; anal spines presumably small.) 
Johnius crowvina Castelnau, Anim. Nouy. ou Rares de l Amér. du Sud, Poissons, 11, 
plate v, fig. 1, about 1855 (Rio Crixas, Rio Araguay). 
Sciena crouvina Giinther, Cat. Fish. Brit. Mus., ii, 287, 1860 (copied). 
Johnius amazonicus Castelnau, Anim. Nouv. ou Rares de ’VAmér. du Sud, Poiss., 12, 
plate iv, fig. 1, about 1855 (Amazon). 
Sciena amazonica Giinther, Cat. Fish. Brit. Mus., ii, 284, 1860 (River Chapin, 
Para). 
? Corvina monacantha Cope,* Trans. Am. Phil. Soc., 1866, 402 (near Parimaribo, Dutch 
Guiana. 
? Scieana monacantha Jordan, Proc. U. 8. Nat. Mus., 1886, 587 (name only). 
Habitat.—Rivers of Guiana and Brazil. J 
We have examined specimens of this species from Obidos, Avary, 
Rio Puty, Tajaparu, I¢a, Coary, Rio Trombetas, and Lake Hyanuary 
in Brazi:. Our description is chiefly taken from 10867, M. C. Z., from 
Obidos, and 10857 from Coary. 
We regard the Johnius amazonicus and Johnius crouvina of Castel- 
nau as identical, and we follow Dr. Steindachner in placing both in 
the synonymy of the earlier Scicna squamosissima of Heckel. We have 
seen no specimens of this species from Guiana. It seems to us, how- 
ever, that the scanty descriptions published of Sciwna rubella and Cor- 
vina monacantha resemble this species more than any other, although it 
is not impossible that both should be referred to Plagioscion surinamen- 
sis. If the latter.should be found to be the only species of the genus 
in Guiana, it should stand as Plagioscion rubellus. 
83. PLAGIOSCION SURINAMENSIS. 
Pseudosciena surinamensis Bleeker, Arch. Néerl. Sci. Exact. et Nat., viii, 458, 1873 
(Surinam). 
Sciena surinamensis Steindachner, Fisch-Fauna des Cauca, 1880, 4(Rio Cauca). Jor- 
dan, Proc. U. 8. Nat. Mus., 1886, 587 (name only). 
Sciana magdalene Steindachner, Zur Fisch-Fauna des Magdalenen-Strome s, 6, 1878 
(Rio Magdalena), 
Sciena magdalene Jordan, Proc. U. 8. Nat. Mus., 1886, 587 (name only). 
Habitat.—Rivers of the northern part of South America. 

~ *The following is the substance of Professor Cope’s deseription of Corvina mona- 
cantha : 
First ventral ray Pagecees as‘a filament which reaches past the vent ; pseudo- 
branchie none; eyes 5 in head; depth equal to length of head; preopercle sharply 
serrate on its tibial margin; pharyngeal patches of teeth small, the teeth bristly; 
caudal fin sublanceolate ; pectorals as long as ventrals without filaments ; anal spine 
short, single in typical specimens; color, silvery, grayish above ; no eM D. X-I, 
33; A. 1,5. Scales 10-49-16. 
