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actually be the case, then the name Pediculopsis dianthophilus (Wolcott) should be applied to the American species. It has been pointed out above that males represent approximately 5% of the normal brood. A count of the chromosome numbers of 180 embryos chosen at random showed 9, or 5%, of these to have haploid sets of three chromosomes (Fig. 1, b). Furthermore, a female containing but a single embryo was fixed. This embryo was in an early cleavage stage, and its sex was not determinable from its gross appearance. Microscopic investigation showed this embryo to possess the haploid complement of three chromosomes. It has been demonstrated above for cases in which females bear but one offspring that the unique offspring are male. From this statistical correspondence of the cytological data with those of the sex ratio, it seems highly probable that the males are haploid, and that Pediculopsis graminum (Reut.) is arrhenotokous. This investigation has been carried on in the laboratory of Professor Franz Schrader, to whom I make grateful acknowledgment. 1 Cheyletus eruditus Schr. and Amblyomma dissimile Koch are quite generally believed to be firmly established as parthenogenetic. However, the possibility that these species may be self-fertilizing hermaphrodites seems neither to have been ruled out nor considered.

I have indicated certain lines of demarcation between the different genera of the Articulated Corallines. In attempting to arrange species hitherto described or undescribed under the genera thus instituted, it has become necessary to propose certain new species and also certain new specific combinations. The present paper deals with some of those occurring in the North Pacific area. 1. Bossea californica (Decne.) comb. nov.-Amphiroa (Arthrocardia) californica Decaisne, Mem. sur les Corallines, pp. 112, 1842. Fronds 5-12 cm. long; branching dichotomous-digitate-corymboid; intergenicula near the base thick cylindrical, 1-3 mm. long and 2 mm. broad, and those of the upper parts thick compressed, mostly obcordate, with lobes rounded, 2-5 mm. long and 2-6 mm. broad; tetrasporic conceptacles on the flat surfaces of the intergenicula, 2-8, mostly 6, on each surface, arranged in rows along the lateral margins, 2-4 on each side, with pores central. Species type: Amphiroa (Arthrocardia) californica Decaisne (loc. cit., p. 112). Type locality: "California (Monterey)." Species topotype: tetrasporic, Herb. Univ. Calif. No. 266290; Pacific Grove, Monterey County, coast of central California, west coast of North

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