63 363 



Portunus (Xiphonectes) longisp nosus (Dana). 



Neptuniis (Hellcnus) longispinosus Alcock, LXVIII, 40, 189!). 



Koh Kahdat, 1 fatli., sandy bolloni, sponges, dead corals; I. 11; le?. S. of 

 Koh Mak, 5—6 fath., II. 7; 2 juv. Koh Kahdal, 4—5 falh., sand, stones, coral; 

 II. 15-18; 25 c? 25? (13 evig.). 



Subfamily Thalamitinæ. 

 Lissocarcinus boholensis Semper. 



Lissocarciniis boholensis Semper, in Nauck, Zeits. Wiss. Zool., XXXIV, pp. 00 and 07, 18H0. 



15 miles West of Koh Kut, in Salpæ, 1 ? immature. 



This small specimen is very little broader than long (3'7 mm. long, 38 mm. 

 broad)'. The anterior two-thirds of the carapace approaches a circular form, the 

 postero-lateral margins arc concave, and meet the broad and lightly concave posterior 

 margin (which is half as wide as the carapace) at a blunt obtuse angle. Dorsal 

 surface nearly flat and crossed by fine transverse lines, which are very apparent and 

 fairly continuous on the anterior half but posteriorly become fainter and more broken. 



Fronto-orbital distance very little less than extreme width. Front strongly 

 projecting and (exclusive of orbital angles) about one-third width of carapace, 

 bilobed, with a distinct median emargination and a short median furrow, each 

 lobe sloping backward and outward and with nearly straight margin. Inner orbital 

 angle subacute. Orbit large, its upper border entire. Eye very large. 



Antero-Iateral border thin, cut into five (including the orbital) short blunt 

 teeth, scarcely projecting, and indicated more by the furrows between them. 



Basal joint of antenna narrow, its outer angle produced. The exclusion of 

 the llagellum from the orbit is very slight. Antennules very large, obliquely folded. 



Chelipeds stout, but little longer than carapace; surface finely roughened. 

 Inner angle of wrist dentiform. Hands full, wider than their superior length, two 

 granular ridges above and one or more obscure ridges on outer surface. Fingers 

 deeply grooved, not gaping, and crossing some distance behind the tips. Legs 

 narrow, first three pairs as long as chelipeds; merus of last pair one and one-half 

 times as long as wide, its posterior border, as well as that of the merus, smooth. 



Shape of carapace and front something as in L. polybioides Adams & White 

 (c/". Alcock, LXVIII, p. 19, 1899), but anterior and posterior margins wider, orbits 

 much larger, side teeth more as in L. orbicularis Dana (c/'. Alcock, op cit., ]>. 20). 



Charybdis cruciata (Herbst). 



Chanjbdis {Goniosoma) crncifera Alcock, LXVIII, 51, 1899. 



Fishing-weir at Koh Kong; I. 21; 2?. S. of Koh Kut, 17-20 fath., mud 

 (large seine); I. 28; 1 ? 2 juv. Paknam-w^en; II. 11; 1 ?. 18 miles W. of Koh 



' Nauck says, on page 67, "langer als breit", but on page CU the dimensions are given as 14 mm. 

 long, 17 broad. Cf. footnote on page 18. 



