A treatise on zoology . THE CYSTWEA 45 passiuj^ \\\> into the suture lines und into the ends of the canals, smootlion its inner surface. Doubt has heen cast on the existence of these threelayers, but examination of well-preserved specimens suggests the follow-ing interpretation :—(i/i) is homologous with the mesostereom of allEchinoderms, its plates were deposited in a stroma of connective tissue,and presented not only large meshes, but continuous larger canals forthe passage of strands of stroma, and perhaps of lacunar blood-vessels :the stroma was thus continuous throughout each plate, an
A treatise on zoology . THE CYSTWEA 45 passiuj^ \\\> into the suture lines und into the ends of the canals, smootlion its inner surface. Doubt has heen cast on the existence of these threelayers, but examination of well-preserved specimens suggests the follow-ing interpretation :—(i/i) is homologous with the mesostereom of allEchinoderms, its plates were deposited in a stroma of connective tissue,and presented not only large meshes, but continuous larger canals forthe passage of strands of stroma, and perhaps of lacunar blood-vessels :the stroma was thus continuous throughout each plate, and strands oftenpassed over the outer surface, uniting the larger strands and sometimesproducing the grooves bent in horse-shoe, as at 2 in Fig. I. ; (e) is not.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
