262 



one in the postcardium is constant, — in addition to a pair of large spines, dis- 

 posed transversely, in the front part of the gastric region : the frontal margin is 

 convex, and is armed with two spines, one above the antenna on each side, while 

 below the frontal margin a large spine is interposed between the eye and the 

 antenna : the lateral margins are deeply trilobed in front of the cervical groove, 

 each lobe culminating in a spine, while behind the cervical groove is a row of 

 three smaller and successively decreasing spines : the posterior border is broadly 

 raised and armed with some spines. 



Of the abdominal terga the second has, in the middle line, on the front edge, 

 one strong tooth, while the third and fourth have in the same situation a pair. 



The eyestalks are freely movable, and are not prolonged beyond their 

 cornea. The thoracic appendages have many long seta? in addition to the 

 general investment of down. The external maxillipeds have the meropodite 

 armed, on the inner border, near the proximal end, with two very large unciform 

 spines, and, on the outer border, distally, with a strong spine. The chelipeds 

 are considerably longer than the fully-extended body, but are stout : the ischio- 

 podite has two distal spines, one above, the other below : the meropodite has 

 three series of strong spines along its inner and upper surface : the carpopodite 

 has a distal ring of teeth, and a few sharp tubercles on its upper and outer surface : 

 the hand is unarmed, the fingers being about two-thirds the length of the palm. 

 The second to fourth thoracic legs have the meropodite and carpopodite spiny : 

 in all the dactylus is remarkably long (about two-thirds the length of the propo- 

 dite) and remarkably hairy on both edges, the posterior edge also being multi- 

 spinate. The telson, which, as is usual in this genus, appears quite plainly to 

 consist of a somite and incompletely fused appendages, has its postero-lateral 

 angles remarkably thickened and recurved, and its lateral borders thickly clothed 

 with setae of a peculiarly firm consistence and of a dark colour. 



Colour in life, chalky pink. 



In the largest specimen the length of the fully extended body is 111 millim., 

 and that of the chelipeds 205 millim. 



Arabian Sea, off Colombo, 142-400 fathoms : Andaman Sea, 405 fathoms. 



In one specimen there are two spines on one side of the rostrum. 



Regd. Nos. — (Type of the species) : — ^ — - 



32. MUflidopsis (GalatJiodes) tr achy pus, Alcock & Anderson. 



Munidopsis trachypus, Alcock and Anderson, Jonrn. Asiatic Soc. Bengal, Vol. LXIII. pt. 2, 1894, p. 169. 

 Illustrations of the Zoology of the Investigator. Crustacea, Plate XI. Fig. 2. 



Carapace and appendages everywhere closely, sharply, and evenly spinate. 

 No epipodites are present on any of the thoracic legs. 



