Report on the zoological collections made in the Indo-Pacific Ocean ...

;524 COLLECTIONS FROM THE WESTERN INDIAN OCEAN.the pterj-gostomian region ; the basal antennal joint is slender, butnot, as in E. aspera, longitudinally sulcated. The chelipedes in thesingle male examined (which is, however, of verj' small size) aresmall and slender ; the merus-joint armed with a longitudinal seriesof small spines and other spines irregularly disposed ; wrist andpalm also armed on the upper and outer surfaces with numerousirregular spines ;palm slender, about twice as long as the fingers,which are straight, not denticulated, and meet along their innermargins. The merus-joints of the ambulatory legs are armed abovewith a double longitudinal series of small spines, and there arespines also on the two following joints. Colour (in spirit) rosepink.Length of the body to the apex of one of the rostral horns inthe largest specimen (a female) rather over 5 lines (11 millim.)breadth nearly 3 lines (H millim.).There are in the collection four females and a small male, fromProvidence Eeef, 24 fms. (No. 215).This species is evidently nearly allied to E. Jongimanus, 8timpson,dredged with Gorgonice at 10 fms. off the Cape of Good Hope *,which is only known to me by the short Latin diagnosis of itsauthor ; but it is distinguished not merely by the much shorterrostral spines and chelipedes (which may vary with age), but alsoby the absence of teeth on the branchial regions and posterior marginof the carapace, and the non-carinated ambulatory legs. Nothing issaid by Stimpson of the form of the Qattcned pajyilhe of the cara])ace,nor does he mention the existence of the cardiac spine or of thespines on the wrist and palm of the chelipedes, &c. As in his species,the upper orbital fissure is closed in E. stimpsonii.Evrynome erosa,A. M. -Edwards f, from Samoa (Upolu), is a muchbroader species, with less distinctly spinose legs, and the flattenedprominences of the carapace are smaller and very diffierent in formand position.11. Micippa thalia, Ilerhst, var. haani, Stimpson.A small male collected at Providence Island, 19 fms. (No. 217),seems to belong here. An adult male, closely resembling De Haan'sfigure, is in the British-]\Iuseum collection from Mozambique {Prof.Bianconi), designated " J\Jidp2)a cornuta, Eiauconi," and a smallmale from Pa-tchu-San {H.M.tS. Samarang').'This variety (for I can scarcely regard it as specifically distinct)is mainly distinguished from the species designated 3/. thalia in theMuseum collection by having a prominent supraocular sjnne, andby the much greater prominence of the s])ines on the gastiic andbranchial regions and of the lateral margins in the adult ; in theyounger specimens, however, all except the supraocular spines arevery small. As the supraocular spines seem to be referred to inHerbst's original description of M. thalia, they cannot be cited as* Proc. Acad. Nat. Sei. Pliilad. p. 219 (1857).t Journ. Mus. Godeffroy, i. p. 78, pi. xii. fig. 1 (1873).