The book Alaska volume 141 was written by author Harriman Alaska Expedition 1899 Here you can read free online of Alaska volume 141 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Alaska volume 141 a good or bad book?
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The original description of P. Hexactis was as follows: " Disk broad, very high, evenly convex, with a rather large central opening surrounded by circles of prominent, imbricated, and webbed spines. Rays six, short, broad, tapered to blunt tips, their lateral margins convex. Lesser to greater radii, about as i to 1. 5. Lesser radii, 22 mm. ; greater radii, 32 mm. To 35 mm. , in the alcoholic specimen ; height of disk, 30 mm. " The surface of the disk is covered with very numerous small spinules..., covered more or less completely with a thick skin-like membrane, and arranged in irregular, divergent groups. " The integument between the spinules is thick, smooth, firm, and everywhere perforated by numerous very small, round pores. " In each interradial region there is a narrow, radiating groove, lined with thick naked integument, destitute both of spinules and pores, but showing a wrinkled surface. These grooves commence at about one-fourth the distance from the dorsal center to the margin.
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