. The Cambridge natural history. Zoology. 6i4 ECHINODERMATA podia become later enclosed in grooves in the corona, and are reduced to vestiges in the adult. The Auricularia is the only type of Dipleurula in which larval mouth and anus are retained. For this reason it has been antero-lateral arm. postero-dorsal arm. â . Fig. 291.âPour views of Echinopluteus from the left side, to show the metamorphosis. A, B, and C are taken from the development of Mchinus miliaris. D is a young Echinus esculentus. The rudiment of the oral disc of the £chi7ius is seen beginning in B and larger in C.
. The Cambridge natural history. Zoology. 6i4 ECHINODERMATA podia become later enclosed in grooves in the corona, and are reduced to vestiges in the adult. The Auricularia is the only type of Dipleurula in which larval mouth and anus are retained. For this reason it has been antero-lateral arm. postero-dorsal arm. â . Fig. 291.âPour views of Echinopluteus from the left side, to show the metamorphosis. A, B, and C are taken from the development of Mchinus miliaris. D is a young Echinus esculentus. The rudiment of the oral disc of the £chi7ius is seen beginning in B and larger in C. , Adult stomodaeum ; , adoral ciliated hand ; , ciliated epaulette ; coe, coelom ; , prismatic spine of dorsal surface (periproct) of adult; ech, rudiment of Echinus ; int, intestine ; , larval oeso- phagus ; mp, madreporic pore ; nerve circ, nerve - ring of adult; pod, iirst paired tuhe - feet; st, stomach ; t, terminal tentacle of the radial hand ; , pointed ventral spine of adult. A, B, and D magnified 45 diameters ; C, 60 diameters. supposed that its median plane of symmetry remains the median plane of the adult. The researches of Bury ^ have shown that this is not so. As in other types of Dipleurula (with the possible exception of the Ophiopluteus) the adult position of the ' "The Metamorphosis of Echinoderms," Quart. Journ. Micr. jJc. xxxviii. 1895, p. 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
