Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fig. 72.—Apiocrinus rotunda. Fig. 73.—Encrinus moniliformi* THE SKELETON OF MOLLUSCA. 103 tremity of which the eyes are situated, corresponding to theirposition in the echinidse ; the summits of the arese being ana-logous to the extremities of the rays bent up towards theanal pole. In the CKIKOIDEJE, or sea lilies, which may be likened tosea-stars supported upon many jointed columns, the skeleton isvery complicated, being composed of many
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fig. 72.—Apiocrinus rotunda. Fig. 73.—Encrinus moniliformi* THE SKELETON OF MOLLUSCA. 103 tremity of which the eyes are situated, corresponding to theirposition in the echinidse ; the summits of the arese being ana-logous to the extremities of the rays bent up towards theanal pole. In the CKIKOIDEJE, or sea lilies, which may be likened tosea-stars supported upon many jointed columns, the skeleton isvery complicated, being composed of many thousand separatepieces, beautifully and nicely fitted to each other. Fig. 72represents the pear encrinite (Apiocrinus rotunda), from theBradford clay ; and fig. 73, the lily encrinite (Encrinus mo-niliformis), from the Muschelkalk. These stalked echinodermsattained a great generic development in the palaeozoic rocks,entire strata being sometimes composed of their brokenskeletons ; their forms are less numerous in the triasic andoolitic periods ; a few only are found in the chalk, and onerare species lives in the warm regions of our present seas.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
