Image d'archive à partir de la page 1052 de la cyclopaedia de l'anatomie et. La cyclopaedia de l'anatomie et physiologie cyclopdiaofana03todd Année : 1847 poissons. Fig. 495. 96S "squelette du Lampris guttata, montrant les os interspinaux, facilement reconnaissables à leur teinte sombre. sont remplies dans acanthopterygious avec poissons, et ramifiés ou rayons mous, comme celles que l'on retrouve dans l'Malacopterygii. Ils sont tous divisés par un raphé longitudinal ou latéral, suture en deux moitiés, afin que chacun semble être formé de deux rayons, siamois-une circonstance qui constitue un argument supplémentaire contre ces parties du système locomoteur

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Archive image from page 1052 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 PISCES. Fig. 495. 96S 'Skeleton of Lampris guttata, showing the interspinous bones, easily recognisable from their dark tint. are met with in acanthopterygious Fishes, and branched or soft rays, such as are found in the Malacopterygii. They are all divided by a longitudinal raphe, or suture, into two lateral halves, so that each appears to be formed of two rays conjoined, —a circumstance which forms an additional argument against these parts of the skeleton being dismemberments of the vertebrae. The rays of the caudal fin are always soft and articulated ; but in many Fishes some of those at its root, both above and below, are gradually diminished in size until nothing is left of them but the hard part forming the base. Skeletons of Chondropterygii.—In the true cartilaginous Fishes, such as the Sharks and Rays, the bones are always destitute of those osseous fibres which give hardness to the skele- ton in the preceding races possessing a true bony skeleton. Their interior remains perma- nently soft and cartilaginous, while their ex- ternal surface is strengthened by becoming en- crusted with a layer of granular-looking calca- reous matter. As there is in the Chondropterygii no depo- sition of bony particles radiating from ossific centres, there can be no division of the cranium into distinct bones, nor of course any sutures: the whole cranium consists of a single cartilagi- nous piece, in which, however, it is easy to dis- tinguish the same regions, the same fossse, the same eminences, and the same holes as in the skull of one of the osseous Fishes; but, although it is not difficult with a little attention to point out the situation of the different bones, to define their limits is impossible. The bones of the face are likewise consoli- dated with the great cranial mass, and conse- quently are quite undistinguishable except

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