OCR Text |
Show 1900.] FROM StNGAPORE AND MALACCA. 727 20. LAMBRUS PELAGICUS Riipp. Lambrus pelagicus, Riipp. Beschreib. 24 Krabben, p. 15, pi. iv. f. 1 (1830); M.-Edw. Hist. Nat. Crust, t. i. p. 355 (1834). ? Lambrus rumphii, Bleeker, Rech. sur Crust, de l'lnde Archipel, Batavia, p. 18 (1856). Lambrus affinis, A. M.-Edw. Nouv. Arch. Mus. t. viii. p. 261, pi. xiv. f. 4 (1872); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 350 (1893). Lambrus pelagicus, de Man, Decap. u. Stom. von Malakka, Borneo, etc., Zoolog. Jahrb. Bd. viii. p. 494 (1895). Hab. Singapore ; from sandy shore at low-water. One male. Dr. deMan, by a comparison with Riippell's original specimens, has shown that the Lambrus affinis of A. M.-Edw. is identical with Riippell's L. pelagicus; and possibly also with L. rumphii Bleeker. Dim. 17x16. 21. LAMBRUS TUMIDUS, sp. nov. (Plate XLIV. fig. 2.) Hab. Malacca; 2-6 fms.; muddy bottom. A male and a female. Carapace a very little broader than long, general surface smooth ; gastro-cardiac and branchial regions strongly tumid, separated by two wide and deep depressions. A median carina, branched anteriorly towards the base of the rostrum and enclosing there a concave triangular space; a low tubercle at the point of bifurcation, a second stronger tubercle in the centre of the cardiac region, and a third, as strong, half-w^ay between the second and the first. Behind the second the carina shelves rapidly to a slightly upturned median spine on the posterior margin; the shelving portion bears a minute tubercle. Antero-lateral margins, behind the narrow hepatic notch, with eight flattened, obscurely laciniated, triangular spines, which increase in size from before backwards to the 7th, while the eighth becomes suddenly twice as large as the 7th, quite thin aud laminate. Between this and the median posterior tooth are three teeth: first, an outwardly directed tooth, as strong as the eighth antero-lateral, carinate above, the carina granular and extending on to the tumid branchial region, where it becomes tubercular ; from the base of this tooth, on the posterolateral margin springs a shorter flattened tooth, not carinate, and bearing in turn at its base a minute tooth; and at a little distance on the external angle of the posterior margin, a tooth equal in size to the median posterior. The bed of the furrow separating the gastro-cardiac and branchial regions has in it four or five relatively deep holes, having the appearance of pin-pricks. Rostrum conical, acute, with a single, obscure tooth on either side of the base, just above the eye. The suborbital tooth is very strong and carinated below; a low granulated cariua extends from the base of this tooth to the base of tbe chelipedes : pterygostomian regions otherwise smooth, under a covering of rather dense hair which |