378 
ACrorOPTERTGII. 
1818. Centrums aculentus, H. D. de Blainville, Nouv. Diet, d Ilist. 
Nat. vol. xxvii. p. 339. 
1835. Rhamphosus aculeatus, L. Agassiz, Neues Jaln'b. p. 291 (name 
only) . 
1839-42. Rhamphosus aculeatus, L. Agassiz, Poiss. Foss. vol. 1V - 
p. 270, pi. xxxii. fig. 7. 
1888. Rhamphosus aculeatus, L. Vaillant, Exped. Scient. Travailleur 
et Talisman — Poissons, p. 339. 
1898. Rhamphosus aculeatus, F. Bassani, Palreontogr. Italica, vol. 1U - 
p. 82, pi. ix. fig. 4. 
Type. Imperfect fish; Museum of Natural History, Paris. 
The type species, attaining a length of about O’ 12. Proportions 
somewhat uncertain owing to imperfection of few known specimens , 
but snout extremely attenuated, the length of tho head with optr 
cular apparatus probably equalling that of the trunk from t < 
pectoral arch to the base of the caudal fin, also about equalling t 10 
length of the dorsal fin-spine, which hears posterior denticulation. ■ 
Probably 8 abdominal vertebrae, and 14 caudals. Dorsal and anal tin s 
equal and directly opposed, each with 9 rays. Scales very minute. 
Form. 6f Loc. Upper Eocene : Monte Bolca, near Verona. 
P. 5125. Small specimen wanting caudal fin and with dorsal spin 0 
imperfect. Purchased, IS® 
Rhamphosus biserratus, Bassani. 
1876. Rhamphosus biserraltis, F. Bassani, Atti Soc. Veneto-Trent. Sc 
Nat. vol. v. p. 151, pi. ii. fig. 3. 
Type. Imperfect fish : Geological Museum, University of 1 adun. 
Bather larger than the type species, with comparatively s 01 
and stout spine, the length of this apparently not greater than 
depth of the trunk at its insertion. 
Form. 4' Loc. Upper Eocene: Monte Bolca. 
Not represented in the Collection. 
Genus AMPHISILE (Klein), Cuvier. 
[Regne Animal, vol. ii. 1.817, p. 350.] 
Trunk oblong and much laterally compressed, with very 
caudal region curved downwards. About 6 large and elonga 
abdominal vertebra, 14 very small caudals. Pelvic fins ru 
mentary, weU behind tho pectorals ; caudal fin rounded. ® 0I V 
plates dorsally and ventrally in abdominal region, the dorsal arm° u 
intimately connected with the endoskcleton ; no scales. 
Existing species of this genus occur in the shallow seas of t 
tropics from the eastern coast of Africa to China. 
