( 31 ) 



Carapace elongate, broadened posteriorly, strongly calcified in front 

 of the cervical groove and in the neighbourhood of the cardiac region. 

 Rostrum usually well developed. 



Abdomen well developed, soft, spirally coiled, with the terga widely 

 separated and— except the first, the last, and the telson— often ill-calcified. 



Eyestalks long and usually slender ; ophthalmic scales well formed, 

 usually spiniform and widely separated. Antennal acicle well formed : antennal 

 flageilum either of moderate length or short, usually setose. 



The external maxillipeds are approximated at base : the exopodites of 

 all three pairs of maxillipeds have a well developed flageilum : the endopodite 

 (palp) of the first maxillae has a recurved flageilum. 



Chelipeds similar, equal, subequal, or one (usually the left) may be 

 larger than the other: the fingers open and shut in a horizontal plane: the 

 finger tips are corneous (usually), or calcareous. 



4th pair of legs not cheliform, the dactylus being terminal: 5th pair 

 cheliform : a patch of imbricating corneous granules is present on the outer 

 surface of the tips of both pairs. 



In the male the first two abdominal somites carry each a pair of unira- 

 mous appendages modified for sexual purposes ; and the next three somites 

 carry, on the left side, each a small appendage of which one ramus is 

 rudimentary. 



In the female the first abdominal somite carries a pair of uniramous 

 appendages : the next three somites carry, on the left side, each a biramous 

 appendage ; and the fifth somite has, on the same side, a small appendage 

 similar to that of the male. In the female also there springs from the left 

 side of the 4th somite a fleshy foliaceous lobe that more or less overlaps the 

 3 appendages in front of it and forms a brood-pouch. 



In both sexes the telson is lop-sided to the left, and the appendages of 

 the 6th somite (tail-fan) are better developed on the left side than on the right : 

 both the rami of these appendages have, on their outer surface, a patch of 

 imbricating corneous granules. 



The gills are phyllobranchiae, and their number and disposition is the 

 same as in Paguropsis. 



The species of this large genus are found in the subtropical and warmer 

 temperate seas, and in the cool sublittoral waters of tropical seas (of which 

 last habitation they seem, in fact, to be characteristic) all round the globe. 



In the Atlantic, they are fairly numerous on the American side, in the 

 sublittoral zones (35-35° fath.) of the West Indies and Spanish Main, from 

 about 25° N. to about 8° S. ; and on the European side they are scattered 



