Malacostracous Crust iceans from Malaysia. 261 



on the carapace. This groove is less conspicuous in Dr. de 

 Man's examples according to their smaller size. In the Sara- 

 wak form also the tooth at the end of the posterior margin, 

 and the three teeth on the anterior margin of the carpus of 

 the chelipedes, are reduced in size ; in fact, the foremost 

 tooth on the anterior margin, and the one just behind it, are 

 only just visible. These distinctions I consider to be, with- 

 out doubt, due to age only. 



Length 8'5 millim., breadth 8*25. 



Macrura. 

 XX. Genus Calliaxassa, Leach. 



29. CaUianassa Martensi, Miers. (PI. XII. figs. 4, 4 a.) 



Callianussa Martensi, Miers, P. Z. S. Lond. (1884) p. 13, pi. i. fig. 1 ; 

 de Man, Arch. f. Naturg. Jahra:. 53, Bd. i. p. 482, pi. xxi. fig. 1 



(1887). 



Distr. Mauritius, Amboina. 



No. LXVI. llab. Buntal. 



A male. This specimen, though rather damaged — having, 

 in particular, lost both chelipedes — I believe to be a repre- 

 sentative of Mr. Miers's species. It exhibits certain differences 

 on a comparison with the type specimen, but these seem to be 

 explained by the greater size of this example, i. e., they are 

 differences of age. The most striking difference is in the 

 frontal region ; the rostrum is shorter than in the type, in 

 which latter it reaches to the middle of the corneae of the 

 eyes, while in this it barely reaches halfway to the corneae. 

 These corneae are themselves much reduced in size in propor- 

 tion to their peduncles, while the latter have become very 

 acutely angulated at their antero-internal angles, now in front 

 of the corneas, so that the two peduncles form in front a short 

 blunt tooth in the median line. From this angle to their 

 antero-external angles the border is concave, there being 

 another tooth, smaller than the median one, at the latter 

 angle. The whole peduncle is very flattened and the cornea 

 appears only as a small black spot just in front of the centre 

 of its upper surface. Besides this, the ischium and merus of 

 the third maxillipedes form a broad opercular plate, and the 

 dactyl is bent back on the greatly enlarged propodos, so as 

 to make this appendage subchelate. Both these points are 

 more prominently developed in the larger animals than in 

 Mr. Miers's smaller one. In other respects these two forms 

 agree. 



Dim. : Length from tip of rostrum to tip of telson about 

 81 millim. 



