. Echinoidea. Sea urchins. 146 ECHINOIDEA. II. Agassiz (Rev. of Ech. PI. XXV. 27—28). Globiferoiis, rostrate, tridentate and triphyllous pedicellariæ have been found; ophicephalous ones do not seem to occur. The globiferoiis pedicellariæ (PI. XVII. Figs. 37, 49) are very conspicuoiis, with a thick. brownish head; the val ves are very short, with a very large basal part and a short, tubeshaped blade, whicli has 5—6 teeth along each side of the elongate terminal opening and often an onter median one. The stalk has a whorl of free projecting rods at its lower end; the npper end is attenuated. The
. Echinoidea. Sea urchins. 146 ECHINOIDEA. II. Agassiz (Rev. of Ech. PI. XXV. 27—28). Globiferoiis, rostrate, tridentate and triphyllous pedicellariæ have been found; ophicephalous ones do not seem to occur. The globiferoiis pedicellariæ (PI. XVII. Figs. 37, 49) are very conspicuoiis, with a thick. brownish head; the val ves are very short, with a very large basal part and a short, tubeshaped blade, whicli has 5—6 teeth along each side of the elongate terminal opening and often an onter median one. The stalk has a whorl of free projecting rods at its lower end; the npper end is attenuated. These pedi- cellariæ I have found only on the actinal side, and only in specimens from the Mediterranean, never in any specimen from the northern seas. In some specimens from Tamaris (Var), which Professor Koehler has most kindly lent me for examination I find them thiis represented: in one specimen (the largest) they are very niimeroiis and well developed; in foiir specimens there are very few of them, at the moiith or 011 the anal area, and they are small, the basal part being not very large and the whorl on the stalk little developed; in two specimens I find no globiferoiis pedicellariæ at all —. 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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