Malacostracous Cruslaceaus from Malaysui. 257 



Epigastric lobes very prominent ; no crest parallel to the 

 anterior niari^nn of the front, general surface of the carapace 

 rather thickly punctate than granular. Upper surface of 

 nieri of ambulatory legs with two granular eminences. There 

 is a minute ej)ibrancliinl tooth as in P. Melanippe, behind 

 which the sides are obliquely rugose. 



In regard to the habitat from which it was taken, there is 

 no evidence to show that this species is essentially a cave- 

 dwelling one ; though its occurrence in a dark cave is very 

 interesting, and shows the possibility of such being the case. 

 The eyes in this individual are normal; its colour is perhaps 

 paler than in the Thelphusid* generally (but cf. Potimon 

 hicristatuin, de Man : " carapace lead-coloured, legs yellowish 

 marniorate "). But a lo-^s of colour of this nature is not 

 necessarily a permanent feature, and proves very little as to 

 the ways of the species as such. The possibility must always 

 be borne in mind that a particular habitat, such as this, may 

 be one temporarily acquired by certain, possiljly locally limited, 

 members of a species ; should this residence become per- 

 manent, a local race may be formed. But in this case, at 

 least, the evidence is very little, and not much can be deduced 

 from it in either direction. 



T>im. : Greatest length 12*25 millim,, greatest breadtli 14; 

 length of penultimate pair of legs 40, length of merus of 

 penult, pair 15. 



XII. Genus Sesarma, Say. 



19. Sesarma calypso, de Man. 



Sesarma (Parasesarma) cali/j)so, de Man, Zoolog. Jal)ib. Syst. Bd. ix. 



pp. 18-5-9, tig. 34 (189G). 

 Sesarma ca/ypso, Lanchester, P. Z. S. Lond. (1900). 



Distr. Atjeh, Singapore. 



No. XXXVIII. Hal). Bunral. 



A female. Superior border of hand raised to a strong crest on 

 its inner side, against which the four peclinatcd ridges abut. 

 Fingers with seven or eight of the characteristic " Treppen- 

 formig " tubercles. 



Dim.'. Greatest length 16 millim., breadth (including ex- 

 ternal orl)ital angles) 20"5. 



20. Sesarma qiiadrata^ Fabr, 



8, I'nbr. Eut. Sy^t. Suppl. 

 •■invia) quad raf IIS, de I Ian 



Dii<(r. Malay .Viehipelagu^ dapiin. 



Cancer qnadratus, I'nbr. Eut. Sy.--t. Suppl. jt. 341 (1798) 

 Grnpsus [ravin/ mm) a) qvadratus, de Ilanii, C'lust, .Jan. ii. T2'2, id. vii 

 tip. 3 (l&W)." 



