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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...lobe clasps) into sixteen broad, crescentic areae ("areolae semilunares," fig. 2, ec). A vane-like-shaped. process of the exumbral zonal muscle (mz) lies between the crescentic folda at the end of each longitudinal furrow. The umbrella corona maybe subdivided into an upper pedal girdle and a lower lobe girdle. The pedal girdle ("zona pedalis") is, however, much less strongly developed than in most other Periphyllidae, and hardly 2 cm. high. The pedalia are slightly vaulted and comparatively small. The lobe girdle of the umbrella corona (figs. 1, 2, " zona lobaris ") is more strongly developed in Periphylla regina and differently shaped from that oi Periphylla mirabilis. The sixteen subradial marginal lobes are much larger compared to the pedalia, and are rounded, not pointed. The difference in size between the four pair of ocular lobes, and the four pair of tentacle lobes alternating with them is considerably greater. Neither the two gelatinous swellings lying in each marginal lobe nor the inter-furrow are so thick as in Periphylla mirabilis; the lobe clasp (" loboporpa," fig. 2, kl), which lies at the bottom of this furrow, and supports the septum between the two halves of the pouch, is much feebler, but shows the same structure in transverse section, fig. 10, comp. above, p. 71), on the other hand, the thin delicate wings (" patagia," lp), which form the selvage of the lobe margin, are much broader and longer in our species than in the foregoing. If we measure from the circular line of the exumbrella, indicated by the insertion of the tentacles between the marginal lobes, the tentacle lobes are 50 mm. long (without wings, 35 mm.), and the ocular lobes only 45 mm. (without wings, 30 mm). The...
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