. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ECHINOIDEA. I. trotus. In our museum is found a small Echinid from Japan, received from the museum in Vienna under the name of ; this determination is scarcely correct, but it might agree with the description of chlorocenlrotus. At all events it is another species than that of de Loriol; it has four pairs of pores, while Brandt gives 5 pairs. (That of de Loriol has 7—5 pairs). In this specimen the o-lobiferous pedieellarke are as in drebachiensis; but the spicules are simple, bihamate. Nothing definite can
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ECHINOIDEA. I. trotus. In our museum is found a small Echinid from Japan, received from the museum in Vienna under the name of ; this determination is scarcely correct, but it might agree with the description of chlorocenlrotus. At all events it is another species than that of de Loriol; it has four pairs of pores, while Brandt gives 5 pairs. (That of de Loriol has 7—5 pairs). In this specimen the o-lobiferous pedieellarke are as in drebachiensis; but the spicules are simple, bihamate. Nothing definite can be said of Sir. chlorocentrotus, until the type specimen has been reexamined. To the species here mentioned, especially intermedins and cldoroccntrotus (?) has to be added iSpharechinus* pulcherrimtis, of which I have received a couple of specimens from Prof. Doderlein; some specimens of this species were further found among some Echinids from Japan, which Prof. d'Arcy Thompson has sent me for examination. Of this species I shall give the following informa- tions. A primary tubercle is found on all the ambulacral plates (as in all the preceding species and, as far as I know, in all polypore species). Only four pairs of pores in each arc, as in intermedins and chlorocentrotus (mentioned by Agassiz). Three ocular plates reach to the periproct. The buccal mem- brane is highly pigmented, with numerous small fenestrated plates, some few of those outside the buccal plates thick, with pedicellarke. The globiferous pedicellarise quite as in drobachiensis; of tridentate pedicellaria; a larger form is found (PI. XX. Fig. 10), a little widened at the point and with rather sinuate edge, and a smaller form, where the edge is straight or only very slightly sinuate. The other pedicellariae show no peculiarities. The spicules are bihamate, not branched. As none of the other species referred to Strongylocentrotus — and, upon the whole, no other Echinids of ^TriplechinidcB-i and <s,Echin
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