. The annals and magazine of natural history : zoology, botany, and geology. the opticchiasma, but also by the eggs. Those of Ilippoglossus, Hip-poglossuideft, Pleiironectes, Microstoniits, and Gli/ptocephaliisare known to have an undivided yi»lk without oil-globule ;whilst those of Paraliclithys^ Citluirns^ Platophrys, Arno-ylossus^ liot/ius, Lepidorhomhus^ Phrynorhombus, and Zeuno-pterus are distinguished by the presence of a single oil-globulem the yolk. The egg of Solea diflTors again, having a numberof small oil-globules at the surface of the cO Maj. X. Uist. Ser. 8. Vol vi. 33
. The annals and magazine of natural history : zoology, botany, and geology. the opticchiasma, but also by the eggs. Those of Ilippoglossus, Hip-poglossuideft, Pleiironectes, Microstoniits, and Gli/ptocephaliisare known to have an undivided yi»lk without oil-globule ;whilst those of Paraliclithys^ Citluirns^ Platophrys, Arno-ylossus^ liot/ius, Lepidorhomhus^ Phrynorhombus, and Zeuno-pterus are distinguished by the presence of a single oil-globulem the yolk. The egg of Solea diflTors again, having a numberof small oil-globules at the surface of the cO Maj. X. Uist. Ser. 8. Vol vi. 33 490 Mr. C T. Tlegan on the Origin and T venture to tliink that it is fairly certain that from someform not very unlike Pstttodes the two groups typified by theplaice and the sole have arisen, and tliat each of these hassplit into two series, a sinistral and a destral. These con-clusions are embodied in the following classification, and maybe expressed diagrammatically thus : — Bothinse. Paralichthiiwe. BotbidsB. Rhoinbosoleinne. Samarinae. Pleuronectinae. Ojnoglossidae. Soleidae. Pleuionecti formes. Soleifornies. \ Pleuronectuidea. Pfiettodoidea. HeterosoQiata. Percoidea. I Evolution of the Order Fltterosomata. 491 Older IIETEUOSOMATA. Asymmetrical, with both eyes on one side. Body stronglycompressed, with the pra>caudal region short; dorsal and analfins loner; caudal fin with 17 principal rays (15 branched) orfewer; pelvic fins G-rayed or less, thoracic or jugular, withthe pelvic bones directly attached to the cleithra. Air-bladderabsent in the adult. Mouth more or less protractile, borderedabove by the praemaxiliaries only. Parictals separated bythe supra-occipital ; interorbital bar mainly formed by thefrontal of eyed side ; frontal of blind side extending to prre-frontal external to upper eye ; no orbito-sphenoid. Pectoralarch attached to skull by a forked post-temporal ; no meso-coracoid. Virtebral column of solid centra coossified withthe
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