. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. SOME JAPANESE ECHIKODERMS. 545 Irotus depressus ; but this point must be left to one of my Japanese colleagues to ascertain. In the later stages of Strong, pulcherrînius-iaxvœ, the long body rods are resorbed and the body shortened, just as in Echinus larvae. (It is with purpose that I do not say ' as in Strong, droebachiensis larvae.' It is true Agassiz has described the complete development of this species, but, as I have already shown in my first paper on Echinoderm-larvae [„Die Echinodermenlarven d. Plankton-Expedi- tion "
. Annotationes zoologicae japonenses / Nihon do?butsugaku iho?. SOME JAPANESE ECHIKODERMS. 545 Irotus depressus ; but this point must be left to one of my Japanese colleagues to ascertain. In the later stages of Strong, pulcherrînius-iaxvœ, the long body rods are resorbed and the body shortened, just as in Echinus larvae. (It is with purpose that I do not say ' as in Strong, droebachiensis larvae.' It is true Agassiz has described the complete development of this species, but, as I have already shown in my first paper on Echinoderm-larvae [„Die Echinodermenlarven d. Plankton-Expedi- tion "], he has there confounded other larvae with those of that species). In the latest stages reached, the larvae had just begun to show signs of approaching metamorphosis ; but vibratile epaulettes had not yet formed. If they form at all in this species is a question I am sorry I must leave undecided. (In the larva of Strong, droebachiensis there are epaulettes ; I can say this, having obtained some larvae in Plankton samples from Greenland, where no other Echinoid occurs, making the correctness of the identification of those larvae beyond the reach of doubt). The rods of the processes are all simple, not fenestrated. Toxocidaris tuberculatum.—The larva of this species is quite different in body shape and in the structure of skeleton from that of Str. pulc'herrimus. In the first stage it is similar to that of Toxo- pneustes pileolus : the body is short, and the skeleton of the body forms a frame, the rods being very strongly thorny. In a later stage, a posterior cross- rod is developed, tr- ending in two very peculiar postero- Fi g. 1.—Posterior cross-rod and postero-lateral rods of lateral rods, which 300 the larva of Toxocidaris tubercttlatus. —— are strongly thorny. 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 t
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