GENUS DAM^US. 405 



lias generally a sliglit tendency to a recurved apex. 

 The rostral hairs are usually rather large and curved ; 

 there is often a larger pair of hairs further back on the 

 frons, like a second pair of rostral hairs ; possibly 

 these maybe the homologues of the lamellar hairs, but 

 this seems doubtful. 



The Labium rather short, not usually covering 

 much more than half the mouth -opening, truncated 

 anteriorly (PL XXXIY, fig. 10; PI. XL, fig. 2), occa- 

 sionally rather longer and with a median point (D. 

 tenuipes, PI. XXXVI, fig. 3). 



The Palpi long, very frequently showing from the 

 dorsal aspect ; they often seem too long to be packed 

 away in the camerastomum. First joints short as 

 usual ; second long and swollen ; third and fourth 

 together usually not so long as the second ; fifth very 

 long, often becoming rather suddenly thinner about 

 the middle and occasionally having an appearance of a 

 slight twist or bend at this point ; the distal end of 

 this joint is usually provided with a tuft of short, fine, 

 presumably sensitive hairs (PI. XXXIX, fig. 6 ; PI. 



XXXVIII, fig. 5). The palpus is often geniculated; 

 the fifth, or fourth and fifth joints being held almost 

 at right angles to the more proximal joints ; this can 

 be altered at the will of the creature (PL XXXVII, 

 figs. 5, 6). 



The Maxillae well developed, but usually rather 

 simple (PL XXXVIII, fig. 3). 



The Mandibles generally rather powerful, but most 

 commonly somewhat unusual in form, being bulbous or 

 swollen in the proximal, muscle-containing part, and 

 rapidly narrowed with a sweeping concave line as the 

 fixed chela is approached (PL XXXV, fig. 6 ; PL XL, 

 fig. 3). Chelae tri- or quadri-dentate. 



The Pseudo- stigmata usually very large, projecting 

 and open, having a cup-like enlargement at the distal 

 end, and sometimes ridges or ribs internally (PL 



XXXIX, fig. 7 ; PL XXXV, fig. 7). They are often 

 borne on rounded lobes of the cephalothorax. 



