60 
ACTIXOPTEETGII. 
Xo inner criisliing teeth ; a few 8toiit conical 
teeth . Chanoides (p. 63). 
Teeth absent; parietal' bones small and separ¬ 
ated by siipraoccipital; a scaly lamella at 
the base of each lobe of the ta’il. CJiayios (p. 64). 
Teeth absent; no scaly lamella at the base of 
the tail ... Prochanos (p. 65). 
II. Dorsal hn more or less extended. 
Trunk deepened; jaws toothless; aorsal fin in 
hinder half of back . Ajicylostylos (p. 66). 
Trunk elonorated ; minute teeth in sinsfle series 
on margin of jaws, stouter teeth within; 
dorsal tin occupying greater part of back . Istieus (p. 66). 
As Istieus, but marginal teeth apparently 
clustered. Anoyynius 71). 
Genus ALBULA (Gronow), Bloch & Schneider. 
[Syst. Ichthyol. 1801, p. 432.] 
Syn. Butyrimis, B. G. E. de Lac^pede, Hist. Xat. Poiss. toI. y. 1S03, 
p. 45. 
Glossodus, Cuvier, in Agassiz and Spix, Pise. Brasil. 1829, p. 48. 
Pisodus, P. Owen {ex Agassiz, MS.), Odontogr. 1845, p. 138. 
Trunk somewhat laterally compressed, and abdomen flattened. 
Snout pointed, and mouth not quite terminal; dentary, premaxilla, 
vomer, and palatines with clusters of minute pointed teeth; para- 
sphenoid, entopterygoid, and tongue each with a patch of compara¬ 
tively large, closely-arranged tritoral teeth; maxilla toothless. 
GiU-rakers short and tubercular; branchiostegal rays about 14 in 
number. Tertebrse in the type species 43 in the abdominal, 25 in 
the caudal region. Pelvic flns opposed to the dorsal, which Is short- 
based, but much larger than the anal; caudal fln deeply forked. 
Scales of moderate size, not pectinated. 
One species of this genus survives in nearly all tropical and sub¬ 
tropical seas. The osteology of the head is well descilbed and 
flgured b}' E. W. Shuieldt, Ann. Eep. U. S. Commiss. Eisheries, 1883 
(1885), p. 808, pi. xii., pi. xiii. figs. 30, 31. 
Albula oweni (Owen). 
[Plate IV.] 
1844. Pisodus owenii, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 247 
(name only). 
0 / 184.V Pisodus owenii, E. Owen, Odontogr. p. 138, pi. xlvii. fig. 3. 
1854. Pisodus owenii, E. Owen, Cat. Foss. Eept. & Pisces Mus. 
E. Coll. Surgeons, p. 167. 
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