. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. KCHINOIDKA. II. 35 The petals are considerably shorter and less developed than in pusillus, the number of pores being almost double in the latter species, when comparing specimens of a corresponding size of the two species, as is easily seen from the table given and from a comparison of figures 5 and 31. PI. XII. The pores are somewhat smaller than in pusillus (those of the inner series smaller than those of the outer series), with no distinct glassy protuberance between the pores of each pair; the pairs are also more obliqu
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. KCHINOIDKA. II. 35 The petals are considerably shorter and less developed than in pusillus, the number of pores being almost double in the latter species, when comparing specimens of a corresponding size of the two species, as is easily seen from the table given and from a comparison of figures 5 and 31. PI. XII. The pores are somewhat smaller than in pusillus (those of the inner series smaller than those of the outer series), with no distinct glassy protuberance between the pores of each pair; the pairs are also more oblique and more distant than in pusillus. It is further a conspicuous feature that the petals are converging outwards, the two series of each petal being more distant at the inner end - likewise a very conspicuous difference from pusillus. (Comp. Figs. 5 and 31. PI. XII). (In one specimen, S-s""" in length, the petals are quite irregular, consisting of some few, scattered pairs of pores; only the right posterior petal is almost normal. Also the genital and ocular pores are quite abnormally placed in this specimen). There is further a considerable difference from pusillus in the number of the small ambulacral pores; on the actinal side they are arranged only in a single series along each horizontal suture, except in the two inner pairs of sets, in which they form, more or less distinctly, two series. This is the case also in the largest specimens seen, gmm in length. On the abactinal side they are arranged as in pitsillus. only I have been unable to dis- cern with certainty such pores within the petals. The genital pores I have found de- veloped in a specimen only 2-8mm in length; on the other hand I have also seen a speci- men of 4mm length with as yet no traces of genital openings. Large genital papilla? may be developed. The tuberculation is somewhat less close than in pusillus, and the glassy protube- rances among the tubercles are likewise less numerous, but, on t
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