208 HISTORY OF BRITISH CRUSTACEA. 



shaped somewhat like a toad, with the abdomen distinctly 

 separated, narrow, and bent abruptly under, in the manner 

 of the Brachyura" 



Gen. 102. PHRONIMA. 



Head large, vertical ; two antennae inserted, one on each 

 side of the front ; tail ending in styliform threads. Body 

 very soft, half transparent. Legs all long, slender, and 

 feeble ; the fifth pair the longest, directed backwards, and 

 ending in a strong, swollen, two-fingered claw. 



Phronim a sedentaria. Fleming's Hermit Screw. (Plate 

 XI. fig. 4.) — Body nearly transparent ; two first pairs of legs 

 compressed and prolonged at the end. 



Found by the Rev. Dr. Pleming at Burray, among the 

 Shetland Isles. 



This curious creature lives inside a cylindrical cocoon, 

 open at both ends ; the latter is of a gelatinous texture, and 

 is probably formed of the body of some Beroe. 



We have apparently in the British Islands more than one 

 species of the family TypJtida ; they are not well made out. 

 The antennae in this family are inserted on the lower part of 

 the head, and are folded three or four times on each other. 



