. Text-fig. 13. Pegantha clara. A marginal lappet and two tentacles of a young specimen, diameter 3-5 mm., from St. 708, ^.p. = stomach pouch, /).c. = peripheral canal, = margin of lappet, ii. = velum. The collection contains 32 specimens, 29 of which could be measured, varying in diameter between 3 mm. and 50 mm. The number of tentacles in proportion to diameter of umbrella is summarized in the following table: No. of tentacles Average diameter (mm.) 3-5 lO-O 12-7 17-5 23-0 30-2 45-0 Total Width of variation 7-10 14-18 20-23 18-23 21 22-25 28-40 7-40 Average number 8-S 15-7 21-6 20-8 21'
. Text-fig. 13. Pegantha clara. A marginal lappet and two tentacles of a young specimen, diameter 3-5 mm., from St. 708, ^.p. = stomach pouch, /).c. = peripheral canal, = margin of lappet, ii. = velum. The collection contains 32 specimens, 29 of which could be measured, varying in diameter between 3 mm. and 50 mm. The number of tentacles in proportion to diameter of umbrella is summarized in the following table: No. of tentacles Average diameter (mm.) 3-5 lO-O 12-7 17-5 23-0 30-2 45-0 Total Width of variation 7-10 14-18 20-23 18-23 21 22-25 28-40 7-40 Average number 8-S 15-7 21-6 20-8 21'0 237 33-2 20-8 No. of specimens examined 4 3 7 6 I 4 4 29 The four largest specimens had the following numbers: Diam. (mm.) No. of tentacles 42 40 43 33 45 32 5° 28 10-2
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
