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Show 136 MR. E. J. MIERS ON CRUSTACEANS [Feb. 20, and back of the cardiac region which always characterize O. cera-tophthalma. The terminal spines of the eyes in one specimen are quite short; in the other specimen they are longer, but not one third of the total length of the eye. Occasionally they are very greatly elongated; and evidently their length is of no value as a specific character. O. ceratophthalma is a very common and generally distributed Indo-Pacific species. GRAPSUS STRIGOSUS. Cancer striyosus, Herbst, Naturg. der Krabben und Krebse, iii. (part 1) p. 55. pl. xlvii. fig. 7 (1799). Grapsus strigosus, Latr. Hist. Crust, et Ins. vi. p. 70 (1803); M.-Edw. Hist. Nat. Crust, ii. p. 87 (1837) ; Ann. Sci. Nat. Zool. (Ser. 3) xx. p. 169 (1853); A. M.-Edw. Nouv. Archiv. Mus. Hist. Nat. ix. p. 286 (1873), ubi synon. Two specimens, a male and a female with ova, both in an imperfect condition, are in the collection. M. Alphonse Milne-Edwards (I. ci) has excellently summarized the characters which distinguish this common and variable species from the closely allied and still more common and variable G. pictus, and has indicated the synonymy of each species. G. strigosus is distributed throughout the Indo-Pacific region, and is even (as is also G. pictus) found on the western coast of the American continent. GRAPSODES NOTATUS. Grapsodes notatus, Heller, Reise der Novara, Crust, p. 58, pl. v. fig. 2 (1865). Three specimens, a young male and two females, are in the collection, which, I think, belong to this species. Dr. Heller's specimens were from the Nicobars; both the genus and species are unrepresented in the collection of the British Museum. The antero-lateral margins are described as 3-toothed, as are these of the specimens from Duke-of-York Island (including the external orbital tooth) ; in the figure of G. notatus there is an additional small antero-lateral tooth : this is piobably an error of the draughtsman. As in the allied genus Nectograpsus, there is a wide hiatus between the outer orbital tooth and the suborbital lobe; this is mentioned in Dr. Heller's description, but not properly represented in the figure. Dr. Heller's genus Grapsodes is evidently very nearly allied to Nectograpsus of the same author, principally differing in the existence of antero-lateral marginal teeth. The two genera, in fact, bear the same relation to one another in the subfamily Sesarminae as do certain species of Chasmagnathus to Cyclograpsus in the Grapsinse. SESARMA ROTUNDATA. Sesarma rotundata, Hess, Archiv. f. Naturg. xxxi. p. 149, pl. vi fig. 9 (1865). Three specimens of this species, all of them males, are in the collection. S. rotundata belongs to the section of the genus in |