277 



closely covered with subacnto or subsquamiform tubercles similar to those of the 

 carapace. 



The horizontal portion of the rostrum is deeply bifid at tip, and the two 

 spines of the antero-lateral margins of the carapace are much longer. 



The length of the fully-extended body, in the female, is 56 millim., that of 

 the chelipeds 36 millim. 



Colour in life, chalky orange. 



Arabian Sea, off the island of Minnikoy, 1200 fathoms. 



Regcl. No. 25. 







46. Galacanthd SpinOSCl, A. M. Edw. var. trachynotus, Anderson. 



Oalacantha trachynotut, Anderson, Jonrn. Asiatic Soo. Bengal, Vol. LXV. pt. 2, 1896, p. 100. 

 ILLUSTRATIONS OF THE ZOOLOGY OK THE INVESTIGATOR, CRUSTACEA, PLATE XXV. FIG. 3. 



Differs from G. rostratci only in the following particulars : 



Instead of tubercles the carapace and chelipeds are covered, but not so 



closely, with spines and spinules, which, on the carapace, have a very definite 



arrangement. 



The horizontal portion of the rostrum is more decidedly bifid. 



Besides the large gastric and cardiac spines, and the large antero-lateral 

 and hepatic spines, and the numerous spinelets, there is on the lateral border, 

 immediately behind the cervical groove, a spine of considerable size. The 

 posterior border of the carapace is armed with a row of small spines. 



The 2nd-4th abdominal terga are deeply grooved transversely and the raised 

 edges of the grooves are strongly serrated, the middle tooth of the anterior ridge 

 of each tergum being enlarged : a row of teeth is continued on to the correspond- 

 ing terga. There are some scattered tubercles on the 5th and 6th terga, and on 

 the telson, and the anterior border of the 5th tergum is serrated. 



The angles of the 2nd, 3rd and 4th joints of the antennal peduncle are 

 spiniform. 



The terminal spines of the borders of the merus and carpus of the legs and 

 chelipeds are conspicuous. 



Colour in life milky orange. 



In the largest specimen the length of the fully extended body is 30 millim., 

 that of the chelipeds 21 millim. 



Arabian Sea, 912, 912-931 and 947 fathoms. 



The only difference between the Indian specimens and the one figured by 

 Milne Edwards and Bouvier (in Mem. Mus. Comp. Zool. XIX. No. 2, 1897, pi. iv. 

 figs. 14-20) is that in the Indian specimens the spines of the antero-lateral 



