| OCR Text |
Show 724 MR. w. F. LANCHBSTER ON CRUSTACEANS [June 19 10. HYASTENUS ORYX A. M.-Edw. Hyastenus oryx, A. M.-Edw. Nouv. Arch. Mus. t. viii. p. 250, pi. xiv. f. 1 (1872); Hasw. Cat. Austr. Crust, p. 20 (1882) ; Walker, Journ. Linn. Soc, Zool. vol. xx. p. 109 (1887). Hab. Singapore ; littoral. Two males and two females, one with ova. Dim. <S 5-75x9. d 4-5x7. $6-5x10-5. $5-25x8. 11. HYASTENUS PLANASIUS Ad. & White. Pisa planasia, Ad. & White, ' Samarang ' Crust, p. 9, pi. ii. ft. 4, 5 (1848). ' Hyastenus planasius, A. M.-Edw. Nouv. Arch. Mus. t. viii. p. 250 (1872) ; Walker, Journ. Linn. Soc, Zool. vol. xx. p. 109 (1887). Hab. Singapore ; 2-3 fms. A female and two males. On two of these is found a species of Tubularia, fixed to the upper and outer margins of the ambulatory legs. Dim. 6 8-75x12-5. ^ 6x9. $12-5xl7'5. IX. Genus CHLORINOIDES Haswell. 12. CHLORINOIDES ACULEATUS M.-Edw. Chorina aculeata, M.-Edw. Hist. Nat. Crust, t. i. p. 316 (1834). Paramithrax (Chlorinoides) aculeatus, var. armatus, Miers,' Alert' Crust, p. 193, pi. xviii. t. A (1884). Chlorinoides aculeatus, Henderson, Trans. Linn. Soc, Zool. vol. p. 345 (1893). Hab. Singapore and Malacca; 10-18 fms. Rough bottom. One large aud one small male from Singapore ; and two smaller males from Malacca, in which the spines of the carapace and meropodites are relatively less developed. Mr. Miers's variety armatus is founded on-(a) a small tooth-like expansion on the posterior margin of the postocular spine, and (b) the " existence (usually) of two spines at the distal ends of the merus-joints of the ambulatory legs " (t. c). As regards (b), M.-Edwards describes the ambulatory legs as " garnies d'une forte epine a l'extrcmite des troisieme et quatrieine articles"; and Mr. Miers's two spines are not invariably found. In my specimens, the larger male trom Singapore has the second spine well developed, the smaller male very much less so. lu the two still smaller males from Malacca the second spine is absent, though the postocular tooth still bears a small tooth on its posterior margin. I hardly think the slight difference in the postocular tooth is sufficient to admit of accepting a distinct variety. Prof. Henderson points out the similarity between the postocular tooth of var. armatus and that of a form figured by de Haan as Maia (Chorinus) aculeata; but the arrangement of the dorsal spines in this figure show that it is wrongly referred to |
