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

CRUSTACEA. 1954 fms. (No. 122), length to base of rostrum little over 5 lines(11 mm.), and in a small male from Dundas Straits (No. 161), therostral spines are relatively somewhat shorter, and there are onlyvery small tubercles in the place of the lateral epibranchial spines :it is not improbably a young example of H. diaccmthus. Thereare specimens presenting very similar characters in the collectionof the British Museum without definite locality (H.M.S. 'Samaramj ')and from Penang (India Museum).There are specimens in the British-Museum collection from thefollowing points on the Australian coast:—Dunk Island, and lat.20° 58' S., long. 149° 12' E., between Cumberland Island andSlade Point {J. MacgUlivrmj, H.M.S. Eattlesnake ''), Brisbane Water(purchased), Moreton Bay (purchased), Swan River {Bring),Shark Bay, "West Australia {Rayner, H.M.S. ' Herald ').12. Hyastenus (Chorilia) oryx.Hvastenus oryx, A. 31.-Edwards, Nouv. Archiv. Mus. Hist. Nat. viii.p. 250, pi. xiv. fig. 1 (1872) ;Hnsivell, Proc. Linn. Soc. N. S.Wales, iv. p. 442 (1880) ; Cat. Austr. Crust, p. 20 (1882).To this species are referred specimens from several differentlocalities ; e. (j. from the fii'st collection two males and a femalefrom Port MoUe—the males obtained between 5 and 14 fms. (Nos.93, 118), and the female on the beach (No. 95) ; and a femalefrom Port Denison, 4 fms. (No. 122) ; also from the second collectiona good series from Thursday Island, 3-5 fms. (Nos. 165, 177),and Prince of Wales Channel, 7 fms. (No. 169), one female.M. A. Milne-Edwards's types were from New Caledonia ; Mr,Haswell records this species from Darnley Island, Torres Straits ;and there are specimens in the collection of the British Museumfrom Eaine's Islet, North-east Australia (J. B. Jukes), Shark Bay,West Australia [Rayner, H.M.S. Herald ' '), and other Australianspecimens without special indication of locality (BowerOank);also from the Philippine Islands, Corregidor (Cuming), and Chineseseas {H.M.S. Samarang').'In the second part of this Eeport its occurrence is noted at ProvidenceIsland, Masoarenes.The length of the rostral spines and prominence of the prseoculartooth or lobe seems to vary considerably in this species with the ageof the specimen. I regard the Lepidonaxia de^lijjj^ii of Targioni-Tozetti *, founded on a female example, as very possibly a merevariety of H. orga; from which it scarcely differs except in theseparticulars and in the less numerous and prominent tubercles of thecarapace. Certainly it is congeneric with that species.* 'Zoologia della Magenta:' Crostacei, p. 5, pi. i. figs. 4-6, 8, 10, 11 (1877).