116 



species (G. pistorica), but the flagella of the exopodites of the 1st and 2nd 

 maxillipeds are mere vestiges, and the exopodite of the external maxillipeds is 



42. Paratelphusa (Globitelphusa) pistorica, Alcock. (Fig. 31.) 



This species is closely related to G. bakeri, more particularly to the variety 

 cylindrm, resembling the latter in its barrel-like carapace and in the fact that 

 the epigastric crests are usually two distinct little lumps. 



It differs from both, however, in the following particulars, 8 males and 

 7 females having been examined : — 



The side-walls of the carapace are closely covered with fine, oblique rugae 

 which pass over the postero-lateral borders. These are quite visible to the 

 naked eye, whereas in G. bakeri and its variety it is uncommon, even with a 

 lens, to make out much in the way of rugse. 



The epigastric crests, which in typical specimens of G. bakeri can only just 

 be made out, are here, as in the variety cylindrus, plainly manifest as two little 

 widely-separated lumps ; this is almost always the case. 



The exopodites of the external maxillipeds may have a rudimentary 

 papillar palp ; but those of the 1st and 2nd maxillipeds always carry a 

 flagellum of normal length. Now, in none of the specimens of G. bakeri and 

 its variety (numbering in all 28) in the collection have the 1st and 2nd 

 maxillipeds anything more than a vestige of a flagellum. 



In the chelipeds the merus is more rugose, and the surface of the carpus 

 and the upper border of the hand are sometimes faintly rugulose, and some- 

 times the fingers are scabrous, especially near the tijD ; also, the fingers of the 

 larger chelae are stouter, and their enlarged teeth are coarser. But the 

 chelipeds vary a good deal ; a more important point is that in the female they 

 are subequal. 



The legs are decidedly stout, not slender as in G. bakeri. 



In a large male the carapace is .Uhs inch long, 1,^,, inch broad, and Aths 

 inch deep. 



