's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 181 



anterior margin. The legs are remarkable for their hairiness, indeed they 

 are thickly covered with a brownish fur, with only a few longer hairs. 

 In my specimens this coating is most conspicuous on the carpo- and pro- 

 podite of the penultimate pair of legs, so as to conceal the underlying 

 joints in dorsal view, at the under side these joints, like all the legs, 

 are wholly naked. De Man says nothing about this hairy covering, but 

 Alcock states that „the upper surface of the legs, especially in the case 

 of the third pair, is hairy". The first named author rightly remarked, 

 that the distal half of the under margin of the meropodites, especially 

 those of the middle pairs, are minutely denticulate. 



The Museum is in the possession of 4 specimens (1 <ƒ, 3 9) collected 

 at the south coast of Madoera a few years ago by Mr. Buitendijk. 



The range of this small species is now known to extend from the 

 Mergui archipelago to the Gulf of Siam, Malakka and Madoera. 



Finally I give here the dimensions of some specimens in mm.: 



12 3 4 



■ tf 1 ) 9 c? 2 



Distance between external orbital angles . 11.25 14.75 9.5 11 % — 



Distance between the anterolateral teeth . 11.5 15. — 9.8 11.4 



Length of carapace 8.25 10.75 6.5 7.6 



Breadth of the front between the ' ocular 



peduncles 2.5 2.75 2.— 2.15 



Length of the palm (index included). . . 7.25 6.25 8.— 4.75 



Greatest height of palm at insertion of dac- 

 tylus 3.75 2.— — — 



Length of carpo- and propodite of the penul- 

 timate pair of legs 7.5 10. — — — 



1 — 2 are specimens of the Museum, 3 — 4 are those measured by 

 de Man (1888, p. 129). 



M. latreillei (Desmarest). 



1822. Gonoplax Latreillii Desmarest. Hist. d. Crust, foss. p. 99, pi. 9 f. 1, 4 



(East-India and Luzon). 

 1837. M. LatreilliiR. Milne-Edwards. Hist. nat. d. Crust., t. 2 p. 66 (record?). 

 1839. „ Desmaresti Lucas. Ann. Soc. entom. France, t. 8 p. 567, pi. 20 



(Malakka). 

 1847. „ serratus Gray. Cat. Crust. British Museum, p. 37 (Philippines). 



1) This specimen bears a Sacculina at the abdomen, which may have influenced the deve- 

 lopment of the chelipeds; indeed, though the specimen is larger than that of de Man (n° 3), the 

 length of the palm is less. 



13 



(l—XII-1915) 



