372 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [380] 
This species is known from the original discription of Cuvier 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. (Curuga, Brazil). 
Habitat.—Coasts of Brazil. 
The type of this species is a specimen (10922, M. C. Z.) collected at 
Curucga by Professor Louis Agassiz.. We have taken pleasure in nam- 
ing the species for our friend, Dr. Franz Steindachner, 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 O. microlepidotus, 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 (?) bairdi Steindachner, Neue Fisch-Arten k. k. Museen Wien, Stuttgart, und 
Warschau, 40, plate i, fig. 2, 1879 (Santos, Brazil). 
Habitat.—Coast of Brazil. 
We have examined asingle 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.-ANCGYLODON. 
Ancylodon Cuvier, Régne 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, 44 in head; preorbital narrow; eye 64 in head; large canine of 
upper jaw very long, lance-shaped, i. ¢., 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; spinons 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 
3t in length; depth 4; D, IX-I, 28; A. II, 10; scales 75 (pores), 8 rows. 
ANCYLODON, 26, 
