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

25-4 COLLECTIONS FROM MELANESIA.cherrima, from Darnley Island, with Eell's type of A. septemspinosa.(whicli is registered as from Borneo, and is not, as Bell states, ofunknown locality) in the Museum collection establishes the identityof the two species. There is in reality no median posterior marginalspine in A. septemspinosa, the one shown in the figure (andmade much too prominent) being the posterior spine or tubercle ofthe median longitudinal dorsal series, which is situated above theposterior margin. Hence the name septemspinosa is inappropriatefor this species ; and as, moreover, the same specific description isused in the genus Iphis, which, as I have already noticed*, isscarcely distinct from Arcania, I prefer to retain Mr. Haswell'sspecific name.108. Lithadia? sculpta, Hasioell.A male of this very interesting little species was dredged in theArafura Sea at 32-36 fms. (No. 160), where so many other remarkablespecies were obtained. A dried female is in the British Museum,from the collection of H.M.S. Samarang,' but without any 'specialindication of locality. Mr. HasweU's types were from the FitzroyIslands.109. Oreopliorus reticulatus, Adams Sf White.An adult female from Thursday Island, 4-5 fms. (No. 165), anda smaller specimen of the same sex from Friday Island, 10 fms.(No. 153), seem to belong to this species.The specimens in the British-Museum collection are from theStraits of Sunda {H.M.S. ^Samarang') and Philippines {Cuming).From 0. frontalis this variable species may, it would appear,always be distinguished by its very much less prominent and nonemarginatefront.110. Oreophorus frontalis. (Plate XXVI. fig. B.)The carapace is transverse and laterally produced at the branchialregions over the bases of the ambulatory legs ; the margins ofthe carapace at this part form a distinct angle x^dth the anterolateralmargins. The front is very prominent, and divided by avery shallow median notch into two rounded lobes ; it is uniformlygranulated above. The surface of the carapace (seen under a sufficientmagnifying-power) is granulated, the granules most numeroustowards the posterior and postero-lateral margins, and, where notgranulated, it is closely and finely punctulated ; the hepatic regionsare separated from the adjoining parts by a well-defined semicircularsuture, the branchial regions near to the middle line are stronglyconvex. There is a prominent triangLilar acute lobe on the pterygostomianregions. All the postabdominal segments appear to bedistinct, the postabdomen, sternal surface, and inferior parts of thecarapace generally being granulated ; a more prominent tubercle* Vide Ann. & Mag. Nat. Hist. ser. 5, v. p. 317 (1880).