80 DE. J. a. DE MAN Oisr THE iPODOPHTSALMOtTS 



Goniosoma cruciferutu, Alph. Milne-Edwards, Archives du Museum 

 Hist. Nat. 1861, t. x. p. 371. 



One male specimen was collected in the Mergui Archipelago. 

 The distance between the points of the last antero-lateral teeth 

 measures 71 millim., and the cephalothorax is 45 millim. long. 

 The last antero-lateral tooth is directed transyersely outward. I 

 may also add that the posterior margin of the penultimate joint of 

 the natatory legs bears two minute teeth. 



Goniosoma cruciferum is found in the Indian Ocean, the 

 Malayan Archipelago, and in the Chinese and Japanese seas, 

 having been collected at Bombay, Pondicherry, Singapore, 

 Sumatra, Java, Amboina, Port Jackson, the Philippines, Hong- 

 kong, and Japan. 



57. Goniosoma aitine, Dana. (PI. V. fig. 2.) 



Charybdis affinis, Dana, United States Expl. Exped., Crust, part i. p. 286, 

 pi. xvii. fig. 12. 



Goniosoma affiue, Alph. Milne-Edwards, Archives du Museum Hist. 

 Nat. 1861, t. X. p. 384. 



Two fine adult specimens Avere collected in the Mergui Archi- 

 pelago, a male and a somewhat larger ova-bearing female. 



This species is still little known and very rare. As no ex- 

 amples are to be found in the large collections of the Leyden 

 Museum, the following remarks may be desirable. 



As Dana observes, this species is very similar to Goniosoma 

 cruciferum, Fabr. ; I will therefore compare it with the specimen 

 of the latter which is in the collection. 



The cephalothorax of the male is 23^ millim. long and 37 

 millim. broad, that of the female is 26| millim. long and 43 millim. 

 broad ; the proportion of the breadth and the length of the cara- 

 pace is therefore in this species quite equal to the same proportion 

 in G. cruciferum. As regards the structure of the upper surface 

 of the cephalothorax, both species agree very well with one 

 another ; but the antero-lateral regions are more depressed and 

 even a little concave in G. affine. The whole upper surface is 

 covered with a close down of very short hairs, and marked with 

 the same minutely granulated transverse lines which are found 

 in G. cruciferum. 



The frontal teeth also closely resemble those of the latter 

 species, but still more so those of G. qwadrimaculatum (A. Milne- 

 Edwards, op. cit. pi. xxxiv. fig. 3) ; they are scarcely acute, much 



