. The skeleton of the black bass . skeleton of this bass isreproduced from a photograph of a carefully dissected and dried skeleton, it will beobseryed that a little ligamentous material is remaining, and some of the bony lin-rays and spines are very slightly uuparallel, but this faiit will lead no one astray, asIt is quite evident which bones have become so while the skeleton was drying. Thearrangement of these osseous Jin-rays and interspinous bones practically agrees withthose elements as we have long known them to exist iii all ordinary bony fishes, as inthe common yellow perch for example
. The skeleton of the black bass . skeleton of this bass isreproduced from a photograph of a carefully dissected and dried skeleton, it will beobseryed that a little ligamentous material is remaining, and some of the bony lin-rays and spines are very slightly uuparallel, but this faiit will lead no one astray, asIt is quite evident which bones have become so while the skeleton was drying. Thearrangement of these osseous Jin-rays and interspinous bones practically agrees withthose elements as we have long known them to exist iii all ordinary bony fishes, as inthe common yellow perch for example {Perca). The skeleton of the tail in Micropterus is of the typical homocercal type, and devel-ops a very completely ossified vroslylc, directed upward and backward at an angleof about 45 degrees, with a markedly straight vertebral column, as is plainly to beseen in plate 44. The osseous expanded portion of the tail is in the vertical plane, andis thus modified in order to give support to the bony rays of the caudal fin. Possibly. Ast Fig. 8.—Outer aspect of part of shoulder girdle and pector&l fin ofilf. salmoides. Natnralsize and drawnby tbe author from his own dissections. P«., proscapular, with other lettering the same as in fig-^ 7 I may formerly have considered that this expanded portion contained ttoo vertebrw,and it may. In this case the count for thirty-two vertebrte in the column would becorrect; but in the reckoning given above this part is omitted and only the vertebraetaken into consideration which possess the true form of those bones. These terminal modified vertebrae are known as the hypuralplates, and they are verybroad and perfect in M. salmoides. The caudal osseous fin-rays are ligamentouslyattached to the posterior margins of the hypural plates in the simple manner seenamong all ordinary teleostean fishes generally. Both above and below, the 29th and30th vertebra} have narrow and elongated hypural plates springing from them, andthe 29th has the hsema
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