. Echinoidea. Sea urchins. 98 ECHINOIDEA. II. the veitex being at the end of the posterior petals. The sides of the test are almost vertical, the actinal side almost flat. The periproct is sitiiated near the abactinal side, in a slight furrow. The ambulacra ave very little deepened. — The j'oung specimens are somewhat more egg-shaped, bnt the posterior end is high as in the larger specimens, the ontline in profil being niainly the same; only in the specimen of 3""" length the posterior end is yet rather sloping, the anal opening being very near the apical system. To give a detai
. Echinoidea. Sea urchins. 98 ECHINOIDEA. II. the veitex being at the end of the posterior petals. The sides of the test are almost vertical, the actinal side almost flat. The periproct is sitiiated near the abactinal side, in a slight furrow. The ambulacra ave very little deepened. — The j'oung specimens are somewhat more egg-shaped, bnt the posterior end is high as in the larger specimens, the ontline in profil being niainly the same; only in the specimen of 3""" length the posterior end is yet rather sloping, the anal opening being very near the apical system. To give a detailed description of the strnctnre of the test would be superflnons after the elaborate analysis and fignres given by Loven, only a few additional remarks can be given on acconnt of the larger material at disposal. — In the yonnger specimens the peristome and month is as yet qnite embryonal, the labrnm not prominent at all; in the specimen of 3"'™ the peristome is. 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 Mortensen, Th. (Theodor), 1868-1952. Copenhagen, Printed by Bianco Luno
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903
