237 



than any of the others, is not widely dilated : the flagella are short, especially the 

 lower one. 



Antennal peduncle 4-jointed, owing to the fusion of the true 2nd and 3rd 

 joints : the flagellum long. 



The incisor edge of the mandible is entire. 



Of the maxillipeds the 1st pair have a foliaceous epipodite and the 3rd 

 external) pair a flagelliform epipodite. 



The chelipeds and next 3 pairs of legs are well developed, but the last pair 

 of legs are flexed and weak. 



In the abdomen paired appendages are usually present on all the somites 

 (except occasionally the 1st) in the male, and on all except the 1st in the female. 



Key to the genera of Galatheidae of the Indian Benthos. 



I. Integument crisp. The exopodite of the 1st maxillipeds terminates in 

 a flagellum. Eyes facetted and well-pigmented : 



1. Rostrum triangular with serrated edges ... ... GALATHEA. 



2. "Rostrum acutely styliform, flanked on either side by a long 



acicular supraorbital spine ... ... ... MUNIDA. 



II. Integument thick, coarse, and very strongly calcified. The exopodite 

 of the 1st maxillipeds does not end in a flagellum. Eyes opaque, non- 

 facetted and non-pigmented : 



1. Rostrum horizontal : no gigantic spine in the middle of the 



gnstric region ... ... ... ... ... MDNIDOPSIS. 



2. The rostrum consists of a horizontal basal portion and an 



abruptly upstanding distal portion : there is a gigantic 



median spine on the gastric region ... ... ... GALACANTHA. 



Two very small specimens of two species of Oalathea have been dredged in 

 the Andaman Sea at 120 and 405 fathoms. It is quite impossible to identify 

 them. 



MONICA, Leach. 



Jfuntda, Leach j Henderson, Challenger Anotnnra, p. 123 (and references): A. Milne Edwards and Bouvier 

 Ann. Sci. Nat. Zool. (7) XVI. 1894, p. 253, and Mem. Mus. Comp. Zool., XIX. No. 2, 1897, p. 20 (and references). 



Carapace longer than broad, the transverse lines well developed and ciliated, 

 the antero-lateral borders spinose, the cardiac area usually well defined. 

 Thoracic sternum broad. 



Rostrum slender and styliform, flanked on either side by an acicular supra- 

 orbital spine. 



Abdomen simply flexed, the terga usually with transverse sculpture : the 



