26 NOTES ON MILLIPEDES. 



VI. Class Gigantostraca. 

 Order Xiphosura. 

 Family Limulidce. 



The King- Crabs, or Horse -shoe Crabs. 

 " Mengdahn-ndm" of the Siamese. 

 " Belangkas " of the Malays. 



1. Limulus moluccmius. 



I have got live specimens in the Singapore Market on the 

 5th April, in the Bangkok Market 18th June, and in Brunei, 

 Borneo, on the 2nd October. 



I was told in Siam that the King-Crabs usually frequent 

 deep water, but in June, July and August resort to the shallows 

 at the head of the Gulf for breeding purposes ; they are then 

 caught in large numbers for the markets. They will live for a 

 few days in a tub of fresh water. 



In life the carapace is a beautiful, rich, dark, shining 1 , olive 

 colour. 



The largest specimen I measured (at Bangkok) was : — 



mm. 



Total length, 



19.7 inches. 



= 500 



Length of carapace, 



10.2 „ 



= 259 



„ „ tail, 



9.5 „ 



= 241 



Width, „ carapace, 



10.2 „ 



= 259 



Limulus rotundicauda. 







Easily distinguished from L. moluccanus by the round shap- 

 ed tail. 



To be seen for sale in the Bangkok Market with the above. 

 The largest specimen I measured (at Bangkok) was : — 

 Total length, 15.25 inches = 387 mm. 



Length of carapace, 



„ tail, 

 Width „ carapace, 



3. Limulus tridentatus, Leach. 



Also known as Limulus longispinis. Mr. A. 0. Cluneis 

 Ross gave me a large pair caug-ht at Kudat, Brit. North Borneo : 

 the female was the largest and measured : — total length 35.25 

 inches =894 mm., width of carapace 15 inches = 381 mm. 



15.25 inches 



= 387 



8 



= 203 



7.25 „ 



= 184 



7.75 „ 



= 197 



