A tendency to form a “primary madreporic” pore on the right side as well as on the left side exists in Atterias gladatif as in other star-fish and in Echinoderms generally. Metschnikoff as far back as 1874 figured and described a late larva of Asteracanthion with left and right hydropores and hydrocoeles (water-vascular rudiments). According to Field (1892) the double pore is frequently met with in the early larvae of Arterias vulgaris. MacBride (1896) has described a larva of Asterias with a pair of water-pores as well as others in the case of Echinus miliaris (1919). Gemmill (1914, 1916) observed double-pored larvae in Asterias rubens in the proportion of one to ten and in Asterias glaciatis in a slightly greater proportion.

Copyright © 1933 The Company of Biologists Ltd.
1933
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