A treatise on zoology . ventral and providedwith minute teeth. The body is armoured with two rows of overlappingbony plates which, like the surface of the cranial bones, are beset attheir hinder edge with movable denticles (p. 369). There is a strongpectoral spine and an adipose fin. Callichthys, L. ; Corydoras, Lac.—S. America. Family Loricariidae. These are closely allied to the last, but(except in Arges) the bony plates are more numerous and form a com-plete rigid armour on the head and body. The dermal bones arestudded with denticles and the small teeth resemble these in is cu
A treatise on zoology . ventral and providedwith minute teeth. The body is armoured with two rows of overlappingbony plates which, like the surface of the cranial bones, are beset attheir hinder edge with movable denticles (p. 369). There is a strongpectoral spine and an adipose fin. Callichthys, L. ; Corydoras, Lac.—S. America. Family Loricariidae. These are closely allied to the last, but(except in Arges) the bony plates are more numerous and form a com-plete rigid armour on the head and body. The dermal bones arestudded with denticles and the small teeth resemble these in is curious to note that the denticles may be much larger in the malethan in the female. The modified suctorial mouth is below the fiattenedhead, which generally develops a prominent lateral edge and snout (, 375). The orbits shift dorsally, the posterior nostrils moving closeto them. The parapophyses have disappeared, the pleural ribs are sessile,and the anterior neural spines bifid. There is no adipose fin and the. Flc lunceoluta, Gthr. Uppw Ainazuiis. (After Giinther.) gill-opening is small, the opercular bones being also much reduced. Thej)ectoral sjpine is usually very large. The intestine becomes muchcoiled. Sub-Family Arginae. With a naked body and strong ribs. Arges, C. and V.; Astrohlepus, Humb.—S. America. Sub-Family Loricariinae. With complete bony armour andslender ribs. Plecostomus, Gthr. ; Chactost(jriiu-<, Heck. ; Loricaria, L. (Fig. 374) ;Acestra, Kner—S. America. Family Aspredixidae. The head is wide and depressed, the bodynaked and tapering to a long tail ; the gill-opening minute. The largeair-bladder is not enclosed by bone. The pectoral spine is very the skelton resembles that of the Loricariidae in many points,yet there is a leaning towards the Siluridae. There is a small dorsalshield ; the bones of the operculum are vestigial, the opercular disappear-ing altogether. The female carries the eggs embedded in the ski
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