( 32 ) 



from about 43" N. (Finisterre) to Liberia, one species also occurring in most 

 parts of the Mediterranean, and only one species extending into the S. Atlantic 

 (Cape of Good Hope). 



In the Indo-Pacific 23 species (more than half the total number known) 

 are found between the southern end of the Red Sea — eastwards throuoh the 

 cool sublittoral depths of the seas of India — and Japan and New Zealand, 

 their range of latitude being here from about 40° N. to about 40° S. 



In the Western Pacific 7 or 8 species are known from the coast of N. & S. 

 America, between the parallels of 47° 30' N. (Puget Sound) and 41° S. 

 (Llanquihue). 



Those who are interested, in a general vvay, in the question of the 

 affinities and antecedents of the deep-sea Crustacean fauna will be struck by the 

 fact that over 30 per cent, of the species of this primitive genus of Pa^urida: 

 come from depths of 100 fathoms and more ; and in this respect the bathy- 

 metrical distribution of Paouristes recalls that of certain other primitive 

 groups of Anomura and Brachyura, e. g., the Pylochelidce and the Homotidcs 

 and DromidcB. While those who are concerned to interpret the affinities of the 

 sublittoral fauna of Indian seas may find suggestive material in the fact that 

 the largest and most prolific Indian species, P. balanophilus, is hardly to be 

 distinguished from the Mediterranean P. oculatus. 



Key to the Indian species of the genus Paguristes. 



I. Antennal flagellum considerably longer than the carapace : the fingers of the chelipeds 

 meet quite closely throughout their length : — 



A. Eyestalks longer than the antennular peduncle : — 



i. Chelipeds not hirsute or tomentose ; — 



1. Rostrum long and slender : eyestalks slender ... P. haUuwphilus. 



2. Rostrum short, broadly triangular : eyestalks stout P. mundus. 

 ii. Chelipeds densely tomentose ... — ... P. ciJiatus. 



B. Eyestalks shorter than the antennular peduncle „ ... P, calvus. 



II. Antennal flagellum shorter than the carapace : — 



A. The fingers when closed are in close contact throughout their 



length : chelipeds not hirsute ; — 



i. Outer surface of carpus and hand of chelipeds closely 



covered with flat, scale-like, imbricating. ciliated 

 tubercles ... — — •■■ P. longiwstris. 



ii. Outer surface of carpus and hand of chelipeds crisply 



granular ... — - ..P. pusillus. 



B. The fingers when closed leave a gap between their bases : 



chelipeds beset with long bristles, or with matted setae, 



on the carpus and hand : — 

 i. Antennal flagellum nearly as long as the carapace ... P.puniceus. 



ii. Antennal flagellum hardly half as long as the carapace ; — 



a, Eyestalks longer than the antennular peduncle ... P. hiavs. 



b. Eyestalks shorter than the antennular peduncle — P. incoinitatus. 



