. Echinoderms of Connecticut . FIG. 29. Synapta roseola. Calcareous plates. A, portion of calcareous ring; B, anchor and plate from body-wall; C, plates from tentacles; D, plates from longitudinal muscles. (After Clark.) anchors and plates have a tendency to be more slender (Fig. 29). It is the calcareous ring, however, which furnishes the most pre- cise criterion of distinction, for in this species all the plates are rather narrow, and the radial plates have a notch on the anterior border for the passage of the radial nerve (Fig. 29), instead of the perforation found in S\ inh&rens (Fig.
. Echinoderms of Connecticut . FIG. 29. Synapta roseola. Calcareous plates. A, portion of calcareous ring; B, anchor and plate from body-wall; C, plates from tentacles; D, plates from longitudinal muscles. (After Clark.) anchors and plates have a tendency to be more slender (Fig. 29). It is the calcareous ring, however, which furnishes the most pre- cise criterion of distinction, for in this species all the plates are rather narrow, and the radial plates have a notch on the anterior border for the passage of the radial nerve (Fig. 29), instead of the perforation found in S\ inh&rens (Fig. 28). Both species occur on the sand flats at Savin Rock, near New Haven, in great abundance. Clark, in his extensive Monograph on the Apodous Holo- thurians (Smithsonian Contributions to Knowledge, vol. XXXV, 1907), has revised the old genus Synapta and now places our two native species, inhcerens and roseola, in Verrill's genus Leptosynapta. Although his reasons for doing this appear to be perfectly valid, it has been thought best to retain the long familiar generic name in the present work.
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