. The Cambridge natural history. Zoology. f^^^f^'y^^^^^^ _. Fig. 249.—Pourtalesia jeffreysi, slightly enlarged. (From Wyville Thomson.) marked. Pourtalesia, with bottle-shaped posterior prolongation of the test. Platyhrissus, with flattened test. Fam. 5. Palaeostomatidae.—An aberrant family consisting of one genus, Falaeostoma. Petals grooved, with a peripetalous fasciole, but peristome central and pentagonal. Fam. 6. —Spatangoidea of more or less flattened shape, with well-marked petals and a sub-anal plastron as well as 1 This family includes three families discriminated by Meis
. The Cambridge natural history. Zoology. f^^^f^'y^^^^^^ _. Fig. 249.—Pourtalesia jeffreysi, slightly enlarged. (From Wyville Thomson.) marked. Pourtalesia, with bottle-shaped posterior prolongation of the test. Platyhrissus, with flattened test. Fam. 5. Palaeostomatidae.—An aberrant family consisting of one genus, Falaeostoma. Petals grooved, with a peripetalous fasciole, but peristome central and pentagonal. Fam. 6. —Spatangoidea of more or less flattened shape, with well-marked petals and a sub-anal plastron as well as 1 This family includes three families discriminated by Meissner (Bronn'a Thier-Beich, vol. ii. Abt. 3, Buch iv. "Die Seeigel," 1904, p. 402), viz. : Ananohy- tidae, Pourtalesiidae, and XJrechinidae. They only differ in the pores for the tube-feet, which are paired in the first, slit-like and single in the second, and single in the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
