Jordan and Ever maun. Fishes of North America. IL'5 



granular ; fontanelle not continued behind the eyes and without backward 

 projecting groove. Plumbeous above, sides silvery, fins dusky. (Eigen- 

 niaun.) Coasts of South America from Cayenne to Para; common. (Named 

 tor llerzberg.) 



S/Viic/is /< /./');/(!, BLOCH, Ichtbyol., viii, ;>3, pi. 367, 1801, Surinam. 

 .I,-,/IN herxbergii, GrvniEit, Cat., v, 144, 1864. 

 T--lii*'<i'nx In'i-Jn'i-'jii, EIGENMANN, S. A. Nomatogiiathi, 50, 1890. 

 /'<W/i<<//'N argenleus, LACKI-KDE, Hist. Nat. Poiss., v, 94, 1803, Surinam. 

 /;<(</(,< pemecus, CTVIER & VALENCIENNES, xiv, 456, 1839, Cayenne. 

 Hnijntti ,-<i'li'*tinnx, MfLLEK & TunsciiEi,, IIor;<' Ichth., in, 7, 1849, Guiana. 



Hexanematichthys hymeiwrhinus, BLEEKER, Silures de Suriuame, 57, pis. xi and xm, 1864, Suri- 

 nam. 



174. SELENASPIS DOWI, (Gill). 



Head 3J in length. Gill rakers 7 + 15 ; A. 16. Dorsal shield and occip- 

 ital process truncate, the former much broader than long, the latter very 

 short ; the length of occipital process not | its greatest width ; foutanelle 

 short, ending obtusely at a point much nearer tip of snout than front of 

 dorsal. Young with dorsal shield reduced, vomerine bauds separated and 

 i he backward prolongation of palatine bauds obscure. Panama to Guay- 



[uil. (Named for Capt. John M. Dow.) 



-,Vs ,/.,//, GILL, Proc. Ac. Nat. Sci. Phila., 1863, 170, Panama. 



x, STIUNDACHNER, Ichth. Beitr., iv, 19, 1876, Panama. 

 Arinx <li,n-i, .IOKDAN & GILBERT, Bull. IT. S. Fish Com., 1881, 37. 

 Titdtixun'x diri, EIGENMANN, S. A. Nematognathi, 61, 1890. 



175. SELENASPIS LUNISCUTIS, (Cuvier & Valenciennes). 



Head 3| ; depth 5i to 6. D. I, ? ; A. 16 to 19. Palatine bands of teeth 

 with a backward projection. Teeth in jaws coarse, conical; those on 

 vonuT and palate finely granular. The patches separate in young, but 

 united and covering most of roof of mouth in adult. Margin of dorsal 

 plate and of occipital process convex where they meet ; palatine patches 

 of teeth connected by the vomerine patch in front, their inner margins 

 not touching behind. Body rather stout. Head large, flattish above; 

 top of head coarsely granular in young, becoming more finely granular 

 with age. Occipital process broader than long. Dorsal plate large, sad- 

 dle-shaped, broader than long or longer than broad. Fontanelle crossed 

 by 2 or 3 bony bridges, the middle portion more than i its total length. 

 Barbels short. Purplish brown, with brown dots below. (Eigenmann.) 

 Surinam to Rio Janeiro; common, (luna, moon; scutum, shield.) 

 Ariux liniixrn(i., CUVIKII & VALENCIENNES, xv, 109, 1840, Brazil. 

 Arii',- lu,H*'t,tis, GUNTHER, Cat, v, 152, 1864. 

 Y''c7/ ( .vi;-(!.s liutiscutis, EIGENSIANN, S. A. Nematognathi, 63, 1890. 



176. SELENASPIS PARKERI, (Traill). 

 (BRESSON.) 



Allied to S. luniscutis; the teeth on the palate granular. Dorsal plate 

 large, emarginate in front, receiving the pointed occipital process; pala- 

 tine patches either separate or united for their whole length. (Bleeker.) 

 Muddy river mouths, Guiana to Para. (Named for Mr. Parker.) 



