536 MR. vf. F. LA?;ciiESTEii 02s THE [Dec, 3, 



The points of the rostral horns are sharply curved upwards and 

 inwards in this specimen. A typical form, with a single spinule 

 at the hase of each rostral spine. 



Dim. 22x 25. 



Breadth taken between bases oi penultimate lateral teeth. ■ 



III. Genus Hyastenus White. 



3. Hyastenus diacanthus de Haan. 



Pisa {Naxia) diucaiitha, de Haan, Crust. Jap. p. 86, [)1. xxiv, 

 fig. 1 (1839). 



Hyastenus di'icantlius, Miers, 'Alert' Crust, p. 194 (1884); 

 de Man, Arch.f. Naturg. liii. i. p. 220 (1887) ; Alcock, Journ. As. 

 Soc. Bengal, Ixiv. 2, p. 210 (1896). 



Loc. Trengganu. 



A fine female with ova. 



Carapace creamy-coloured, splashed with red ; two, quite low, 

 tubercles on the gastric eminence, one in front of the other, and a 

 very low one, hardly distinct, on the uro-cardiac region. Also 

 another low tubercle, situate on the anterior branchial region a 

 little in front of a line joining the epibranchial spine and posterior 

 gastric tubercle, and lying a little nearer the former than the 

 latter. 



Dim. 26-5 X 34-5. 



IV. Genus Micippa Leach. 



4. Micippa mascarenica Kossmann. 



Micippa phihjva, Leach, Zool. Misc. iii. p. ]6 (1817) (uec M. 

 pTiilyra, Herbst). 



Micippa pliilyra, var. mascarenica, Kossm. Zool. Ergebn. p. 7, 

 pi. iii. fig. 2(1877). 



Micippa mascarenica., Miers, Ann. Mag. Nat. Hist. (5) xv. p. 7 

 (1885) ; Lanchester, P. Z. S. Lond. p. 725 (1900). 



Loc. Pulau Bidan, Peuang. 



A full-grown male; of the legs only one chelipede remains. 

 There are six teeth present behind the postorbital tooth. Mobile 

 portion of antenna a little less than half the length of the carapace, 

 second joint just one-quarter breadth of rostrum at its own point of 

 origin. The single chelipede is quite smooth, except for a few 

 separate and minute granules on the distal portion- of the upper 

 margin of the arm. The lingers meet along their distal half. 



Dim. 24x28. 



Breadth taken between bases oi penultimate lateral teeth. 



V. Genus Lambeus Leach. 



5. Lambrus LOiS^GiMANus Linn. 



Cancer loiujimanus, Linn. 8yst. Nat. (ed. xii.) p. 1047 (1766). 



Lambrus lonyimanus, M.-Edw. Hist. Nat. Crust, i. p. 354 (1834); 

 Miers, Ann. Mag. Nat. Hist. (5) iv. p. 20 (1879); Alcock, Journ. 

 As. Soc. Beng. Ixiv. 2, p. 260 (1896). 



