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688 L- A. BORRADAILE.gaping. The species is allied to H. calvarius but differs in that: (i) the horns are moreslender and diverge more strongly, curving, as well as slanting, outwards, (ii) there is notrace of a knob on the gastric mound, which is also more prominent, (iii) there is noepibranchial spinule or intestinal spine, (iv) the carapace is narrower, and (v) the palm israther more swollen. It was dredged in 30 fathoms in Suvadiva Atoll.14. Halimus espinosus, n. sp. (PL XLVII. fig. 4).The group of forms akin to H. diacanthus (including var. elongata Ortm., 1893, H.suhinermis Zehnter, 1894, H. convexus Miers, 1884, and H. calvarius Ale, 1895) are in alllikelihood no more than varieties of one variable species. The collection contains a specimenof another such form, which I describe here. The following characters, taken together, separateit from its allies mentioned above: (i) carapace narrow (10:6); (ii) gastric region swollen,with traces of the knob; (iii) horns rather less than half the length of the carapace, straight,not very divergent ;(iv) a spinule on each branchial region and a low knob in place of theintestinal spine; (v) the outer angle of the basal antennal joint not strongly marked. Thespecimens, which are both males, were dredged in Haddumati Atoll in 35 and 39 fathoms.15. Halimus agassizi Rathb., 1902.Halimus agassizii, Rathbun, Bull. Mus. Har-vard, XXXix. 5, p. 133, fig. 6.The females of this species have very slender chelipeds with long narrow palms andshort fingers, which gape very slightly. Miss Rathbun's only specimen was taken in thesame locality as ours, Nilandu Atoll, and in practically the same depth, 24 fathoms.Genus Phalangipus Latr., 1825.Miss Rathbun (Proc. Biol. Soc. Washington, XI. p. 159, 1897) has shown that this namemust be substituted for Egeria Leach, 1815, which is preoccupied.16. Phalangipus arachnoides Latr., 1825. Alcock, I. p. 223.Dredged in Mulaku, South Nilandu, and Felidu Atolls, in 25—36 fathoms.Genus Tylocarcinus Miers, 1879.17. Tylocarcinus styx (Hbst.), 1803. Alcock, i. p. 235.Taken on the reef in Male, Fadifolu, and Goifurfehendu Atolls.Subfamily IVIaiinae. Genus Schizophrys White, 1848.18. Schizophrys aspera (A. M.-Edw.), 1834. Alcock, i. p. 243.Taken on the reef in Male and Fadifolu Atolls, and dredged in 34 fathoms in Feliduand 20 fathoms in Suvadiva Atoll.Genus Gyclax Dana, 1852.19. Cyclax (Cyclomaia) suhorhicularis (Stimps.), 1857. Alcock, i. p. 245.Taken on the reef at Hulule, Male Atoll.