Jorda7i and Everinann. — Fishes of North America. 125 



granular ; foutauelle uot continued behind the eyes and without backward 

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

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

 for Herzberg. ) 



Hiiurus her::herijH, Bi.Dcii, Ichthyol., viii, :i.\, pi. 307, iKUl, Surinam. 

 Ariiis herzhergH_ Gl'NTilEU, Cat, v, 144, 18G+. 

 Tackistirns heiT.herijii, EiGENMANN, S. A. Ncniatognathi, 5!), 18'J0. 

 l'imelo<liis urgctilens, Lackpkde, Hist. Nat. Poiss., v, 94, 1803, Surinam. 

 Ilaijrus peiiiec-uf, CuviER & Valenciennes, xiv, 406, 1839, Cayenne. 

 Ii(ujnts c(Klcslinn.% Mi'l.LEK & Tkosciiei,, Hora' lelith., in, 7, 184'.), Guiana. 



Ilexanematkhtlii/s hijmenorhinus, 'Bleek.er, iiiluvea deSnTiaanw, .'J7, jils. xi tiiid xiii, l.siil, Suri- 

 nam. 



1V4. SELENASPIS DOWI, (Gill). 



Head 3i 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 jirocess not i its greatest width ; fontanelle 

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

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

 the backward prolongation of palatine bands obscure. Panama to Guay- 

 aquil. (Named for Capt. John M. Dow.) 



Le}>t<iriiis don-i. Gill, Proc. Ac. Nat. Sci. Phila., 1863, 170, Panama, 

 drills u/i(ij(K, STEiNDAcuNEn, Iclitli. Bi'itr., IV, 19, 1876, Panama. 

 Arivs <l<'if!, J()Ri>AN & GiLiiERT, Bull. r. S. Fish Com., 1881, 37. 

 Tachimms dutri, Eigenmann, S. A. Nematognathi, 61, 1890. 



175. SELENASPIS Ll'SISCUTIS, (Cuvier & Valenciennes). 



Head 3'i ; depth 51 to 6. D. I, 7 ; A. 16 to 19. Palatine bands of teeth 

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

 vomer 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, tlattish 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 'S bony bridges, the middle portion more than i its total length. 

 Barbels short. Purj^lish brown, with brown dots below. (Eigenmann.) 

 Surinam to Rio Janeiro; common. (/«««, moon; sc«<»/«, shield.) 



Ariiis Iniiifciilis, CuviER & Valencie.nnes, XV, 109, 1840, Brazil. 



Ariiia Iniiixadis, GuNTiiEK, Cat., V, 152, 1864. 



Taeliisiirus liiiiu-cidis, Eigenmann, S. A. Nematognathi, 63, 1890. 



176. SELENASPIS PARKERI, (Traill). 

 (Bresson.) 



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

 large, emargiuate 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.) 



