. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. i ( HINOIDEA. II. 151 cellariae were hitherto very insufficiently known; a few figures are given in Revision of Echini —30 aud PI-XXVI. 19, and Koehler (Op. cit. PL 4. 14) gives a figure of one kind of pedi- cellaria;. I have found globiferous, rostrate, tridentate and triphvllous pedicellaria;, but no ophicephalous. The globiferous pedieellariae (PI. XVII. Figs. 12, 47) are rather like those of cordatum, only the blade is generally more elongate (though not always so elon- gate as in the figured valve), and the bas
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. i ( HINOIDEA. II. 151 cellariae were hitherto very insufficiently known; a few figures are given in Revision of Echini —30 aud PI-XXVI. 19, and Koehler (Op. cit. PL 4. 14) gives a figure of one kind of pedi- cellaria;. I have found globiferous, rostrate, tridentate and triphvllous pedicellaria;, but no ophicephalous. The globiferous pedieellariae (PI. XVII. Figs. 12, 47) are rather like those of cordatum, only the blade is generally more elongate (though not always so elon- gate as in the figured valve), and the basal part is nar- rower. 3—4 teeth are found on either side of the term- inal opening, and there may be one in the middle of the outer edge; the terminal opening may sometimes be quite covered by the teeth. As is usual the valves are covered by a thick skin (PI. XVII. Fig. 47); the stalk is rather thick aud compact, knotted, with a distinct thickening above and below, the latter without free projecting rods. — The Fig. 19. PI. XXVI of Revision of Echini >, in the explanation of plates termed an open- headed actinal» pedicellaria, evidently represents the valve of a globiferous pedicellaria. — The rostrate pedi- cellaria; are rather large aud very characteristic (PI. XVII. Figs. 3, 52); the valves are coarsely dentate along the side edges, the point, which is more or less rounded, finely serrate. They reach a rather considerable size, Fig. 25. Apical area of Echinocardium mediterranean ca. 1 — i-2inm length of head. The Fig. 29, PI. XXV of Rev. of Ech. ( long-headed > pedicellaria), as well as the PI. 4. Fig. 14 (pedicellaire gemmiforme) of Koehler (Op. cit.) evidently represent this form. Anything nearly resembling the PL XXV. Fig. 30 of Rev. of Ech. I have not seen. The tridentate pedicellaria; occur in two, not very sharply distinguishable forms; the one (PI. XVII. Fig. 2) has slender, leafshaped valves, the larger ones joining only in the outer half; the lower
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