372 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [30] 



This species is known from the original discretion of Cnvier and 

 Valenciennes and from a more detailed account given by Dr. Stein- 

 dachner. It would appear to be well distinguished from all the others 

 mentioned in this paper. 



24. CESTREUS STEINDACHNERI. 



Cestreus steindachneri Jordan, sp. nov. (Curuca, Brazil). 



Habitat — Coasts of Brazil. 



The type of this species is a specimen (10922, M. C. Z.) collected at 

 Curuca by Professor Louis Agassiz. We have taken pleasure in nam- 

 ing the species for our friend, Dr. Frauz Steiudachner, of Vienna, who 

 has contributed more than any one else to our knowledge of the fishes 

 of South America. 



Cestreus steindachneri seems to be allied to C. microlej)idotus, but it is 

 readily distinguished from that species by numerous characters. It 

 somewhat resembles C. acoupa, but its scales are not half as large as in 

 that species. 



25. CESTREUS BAIRDI. 



Otolithus (?) balrdi Steindachner, Neue Fisch-Arten k. k. MuseenWien, Stuttgart, und 

 Warschau, 40, plate i, fig. 2, 1879 (Santos, Brazil). 



Habitat. — Coast of Brazil. 



We have examined a single specimen of Cestreus bairdi, a young ex- 

 ample (10887,- M. C. Z.) 9 inches long, from Para, 



This species has almost exactly the dentition of the species of Ar- 

 choscion. It cannot, however, be referred to that genus, as it has the fins 

 as in the ordinary species of Cestreus. The difference in the dentition is 

 one of degree only, the lateral teeth being a little larger and more un- 

 equal than usual, and cannot be used to separate this species from the 

 genus Cestreus. 



Genus IV.— ANCYLODOK 



Ancylodon Cnvier, Regno Animal, ed. 1, 1817 (jaculidens = ancylodon). 



Type : Lonchurus ancylodon Bloch & Schneider. 



This genus contains a single species, remarkable for the large size 

 and peculiar form of its canine teeth. 



ANALYSIS OF SPECIES OF ANCYLODON. 



a. Body oblong, moderately compressed, the general form about as usual in Cestreus'. 

 mouth oblique, the lower jaw projecting: maxillary moderate, 2£ in head; snout 

 rather pointed, 4£ in head; preorbital narrow; eye G| in head; large canine of 

 upper jaw very long, lance-shaped, i. e., widened toward the tip and then abruptly 

 pointed; about two canines in front of lower jaw on each side, also lance-shaped, 

 but much smaller; outer teeth of upper jaw enlarged and showing something of 

 the same form; enlarged lateral teeth of lower jaw compressed ; gill-rakers moder- 

 ate, slender, 3+8, the longest $ eye; caudal fin rhombic; spinous dorsal very 

 weak; soft dorsal and anal scaly; pectoral 1§- in head; lateral line becoming; 

 straight before vent ; color bluish above, silvery below ; caudal lobe darker; head 

 3i in length ; depth 4 ; D. IX-T, 28 ; A. II, 10 ; scales 75 (pores), K> rows. 



Ancylodon, 26. 



