254 COLLECTIONS FROM MELANESIA. 



eherrima, from Darnley Island, with Bell's type of A. septemspinoaa 

 (whicli is registered as from Borneo, and is not, as Bell states, of 

 unknown locality) in the Museum collection establishes the identity 

 of the two species. There is in reality no median posterior mar- 

 ginal spine in A. septemspinosa, the one shown in the figure (and 

 made much too prominent) being the posterior spine or tubercle of 

 the median longitudinal dorsal series, which is situated above the 

 posterior margin. Hence the name septemspinosa is inappropriate 

 for this species ; and as, moreover, the same specific description is 

 used in the genus Iphis, which, as I have already noticed*, is 

 scarcely distinct from Arcania, I prefer to retain Mr. Haswell's 

 specific name. 



108. Lithadia? sculpta, HcmveU. 



A male of this very interesting little species was dredged in the 

 Arafura Sea at 32-36 fms. (No. 160), where so many other remark- 

 able species were obtained. A dried female is in the British Museum, 

 from the collection of H.M.S. ' Samarang,' but without any special 

 indication of locality. Mr. HasweU's types were from the Fitzroy 

 Islands. 



109. Oreophorns reticulatus, Adams 6f White. 



An adult female from Thursday Island, 4-5 fms. (No. 165), and 

 a smaller specimen of the same sex from Eriday Island, 10 fms. 

 (No. 153), seem to belong to this species. 



The specimens in the British-Museum collection are from the 

 Straits 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 non- 

 emarginate front. 



110. Oreophorus frontalis. (Plate XXVI. fig. B.) 



The carapace is transverse and laterally produced at the branchial 

 regions over the bases of the ambulatory legs ; the margins of 

 the carapace at this part form a distinct angle with the antero- 

 lateral margins. The front is very prominent, and divided by a 

 very shallow median notch into two rounded lobes ; it is uniformly 

 granulated above. The surface of the carapace (seen under a suffi- 

 cient magnifying-power) is granulated, the granules most numerous 

 towards the posterior and postero-lateral margins, and, where not 

 granulated, it is closely and finely punotulated ; the hepatic regions 

 are separated from the adjoining parts by a well-defined semicircular 

 suture, the branchial regions near to the middle line are strongly 

 convex. There is a prominent triangular acute lobe on the pterygo- 

 stomian regions. All the postabdominal segments appear to be 

 distinct, the postabdomen, sternal surface, and inferior parts of the 

 car^ace generally being granulated; a more prominent tubercle 



* Vide Ann. & Mag. Nat. Hiat. ser. 5, T. p. 317 (1880). 



