Cythere tetrica, G. S. Brady. Cythere tetrica, G. S. Brady, 1880, Rep. Chall., Zool., pt. iii, p. 104, pl. xxiii, 5 a-d. This somewhat striking form has been previously recorded only from Booby Island, Torres Strait, 6 to 8 fathoms. One right valve found in our series. Cythere dictyon, G. S. Brady. Cythere dictyon, G. S. Brady, 1880, Rep. Chall., Zool., pt. iii, p. 99, pl. xxiv, 1 a-y. Five separate valves of this widely distributed species were found, one of which appears to belong to a full-grown female, and shows the posterior spines arranged along the border of the shell. Another example is a small valve of the same sex, whilst the remainder are valves of male specimens. Cythere prava, Baird sp. Cythereis prava, Baird, 1850, Proc. Zool. Soc., pt. xviii, p. 254 (Annulosa), pl. xviii, 13–15. Cythere prava, Baird sp., G. S. Brady, 1880, Rep. Chall., Zool., pt. iii, p. 92, pl. xxii, 4 a-f. G. S. Brady, 1890, Trans. R. Soc. Edin., vol. xxxv, p. 502. Chapman, 1902, Journ. Linn. Soc. Lond. (Zool.), vol. xxviii, p. 426. Idem, 1902, Proc. Zool. Soc. Lond., p. 231. C prava is a South Pacific form, but not exclusively so. It appears to be more at home in shallow water. Our specimen is a right valve, the surface of which is more than usually coarsely sculptured. Cythere dasyderma, G. S. Brady. Cythere dasyderma, G. S. Brady, 1880, Rep. Chall., Zool., pt. iii, p. 105, pl. xvii, 4 a-f; pl. xviii, 4 a-f. In the “Challenger” dredgings this species was characterized as a deep-water form, so that its occurrence in the present sounding is somewhat exceptional. It is also widely distributed. One right valve. Genus Krithe, Brady, Crosskey and Robertson. Krithe producta, G. S. Brady. Krithe producta, G. S. Brady 1880, Rep. Chall., Zool., pt. iii, p. 114, pl. xxvii, a-j. Chapman, 1902, Journ. Linu. Soc Lond. (Zool.), vol. xxviii, p. 427. This very variable form occurs oftenest in deep water. The deepest sounding from which Dr. Brady obtained his specimens was taken at 1,675 fathoms. The writer records