222 G. M. Giles — Notes on the Ampliipoda of Indian Waters. [No. 3, 



which together nearly equal the peduncle of the autennule with the 

 long first joint of its flagellum in length. Its remaining joints if pre- 

 sent cannot be distinguished. Tlie flagellum consists of six or seven 

 short joints. 



The gnathites are remarkably short, the mandibles being especially 

 powerful and provided with a long jointed appendage. The maxilli- 

 pedes are large and pediform, and are terminated by a globular joint pro- 

 vided with a strong claw. 



The second of the tJioracic a/ppendages is very stoutly built, and is 

 terminated by a powerful subchela, the dactylopodite forming a powerful 

 curved claw, and the pi'opodite having its posterior border prolonged 

 into a stout plate, which is curved downwards to oppose the dactylo- 

 podite ; this plate is armed with a number of tooth-like spines not 

 shewn in the drawing. The third thoracic appendage, in general 

 form, closely resembles the second, but it is slightly longer, and very 

 much slighter, and differs also in the basipodite being strengthened on 

 its anterior border by a strong flat plate. The fourth and fifth thoracic 

 appendages are somewhat shorter than the two preceding, stoutly made, 

 and of the ordinary ambulatory type. The sixth, seventh, and eighth 

 have their basipodites provided with large strengthening buttress-like 

 plates ; all three are stoutly built, but, while the sixth is the shortest, 

 the seventh is the longest of all the appendages. The eighth is inter- 

 mediate in length, but has its distal five joints shorter even than those 

 of the sixth, its excess of length over the latter being due entirely to the 

 great size of the basipodite, which is nearly twice as long as that of 

 any other appendage ; it has no strengthening plates on its anterior 

 border, but this is more than compensated for by the immense size of 

 the posterior buttress. 



The first three ahdominal appendages are of the usual swimming 



type, but are somewhat small in proportion to the bulk of the animal. 



The last three appendages are short and stout, and are each provided 



with a pair of short, subequal, styloid rami ; they diminish progressively 



in length and to a less extent in thickness, the last being rather shorter 



than its breadth ; all three are armed with a series of short stout spines. 



The animal differs from any of its congeners enumerated in Spence 



Bate's Catalogue in the first joint of the flagellum and of the appendage 



of the antennule being mai^kedly longer than their successors ; in being 



eyeless ; and in the exceptional development of the gnathopoda, which 



are much better formed even than in the closely allied Opis, a genus to 



which, if this character alone were taken into account, the species might 



be referred. The distinction, however, between Aiwnyx and Opis, resting 



as it does on this character alone, is of very doubtful generic value, and 



