Invertebrate Gallery of the Indian Museum. 59 



there are usually three pairs of foot-jaws or maxillipeds, 

 and five pairs of legs. The last seven segments (abdo- 

 minal segments) are almost always separate and distinct, 

 and all but the terminal one usually carry a pair of swim- 

 ming or jumping feet : the terminal limbless segment is 

 known as the "telson." 



Gills are borne on either the thoracic or the abdominal 

 limbs. 



The nature and typical arrangement of the segments, 

 and of their appendages, should be studied in the disarti- 

 culated specimens of Nephrops, Pensus, Scylla, Cenobita, 

 and Squilla, in Case 49. 



i. CRUSTACEA MALACOSTRACA AMPHIPODA. 



[®£0t£rn cSlaU-ra0^ 50]. 



The Amphipoda are usually very small Crustaceans, and 

 are not therefore adapted for exhibition in the Gallery. 

 Some of the deep-sea species, however, are comparatively 

 gigantic, and a specimen of one of these — Andania, 

 dredged in the Bay of Bengal at a depth of 1,997 fathoms 

 — is exhibited in Case 50. 



Some of the Amphipoda live in freshwater, but the 

 great majority are marine. In the Amphipoda the eyes 

 are never stalked. Of the thoracic segments seven are 

 almost always separate and distinct from one another and 

 from the head. 



The nature of the Amphipod body should be studied in 

 Andania. 



1 he following genera from Indian waters are exhibited : — 

 Andania, Rhabdosoma^ Caprcila, besides a few species 

 from Europe and New Zealand. 



ii. CRUSTACEA MALACOSTRACA ISOPODA. 



[5Ec0t£nt cSlaU-rasc 50]. 

 The Isopoda include the familiar Woodlice, and are 

 small Crustaceans, some of which inhabit dry land and some 



