MUNIDOPSIS ORNATA. 87 



external spine. The chelipeds are robust, setose, and granulate ; the merus 

 has a short superior spine and two lateral spines at the distal end ; the carpus 

 is similarly equipped, though on one side the superior spine is obsolescent ; 

 the chela is broad and strong, the fingers excavated, denticulated on their 

 cutting edges and at their tips. The merus of the first pair of ambulatory 

 appendages has an external distal spine ; the carpus of all the ambulatory 

 limbs has two low longitudinal ridges, and the carpus of the first and sec- 

 ond pair has a spine on the upper border at the distal end of the joint. 



Length, 55 mm.; breadth, 18 mm.; length of carapace, 31 mm.; ros- 

 trum, 8 mm. 



Station 3394. 511 fathoms. 1 male. 



Mimidopsis villosa is very closely allied to the West Indian Munidopsis 

 abhreviata (A. M. Edw.),* from which it differs as follows : the tubercles and 

 ridges of the carapace are more pronounced and the whole surface of the 

 animal more hairy. The frontal border is armed on each side with a sharp 

 spine, which is wanting in M. ahbrevmfa. The median dorsal sjiine on the 

 fourth abdominal somite is obsolete, while the fifth somite bears a well- 

 developed acute spine, like those on the second and third somites. In 

 M. abhreviata the fifth somite is unarmed. The distal half of the rostrum 

 is curved vipward much more strongly in M. villosa than it is in M. abhreviata. 



Munidopsis villosa is represented by a single specimen in the " Albatross " 

 collection. It is very much larger than the type specimen of M. abhreviata 

 from the " Blake " dredgings, and it is possible that the peculiarities above 

 specified may be due to age or individual variation. But I think it more 

 probable that we have to do with two closely allied or representative species 

 on the Atlantic and Pacific sides of the continent. 



Munidopsis ornata Fax. 

 Plate XX., Fig. 1. T. 



Bull. Mus. Comp. Zool., XXIV. 186, 1893. 

 Carapace convex, the whole upper surface, including the rostrum, thickly 

 covered with low squamous tubercles ; under a magnifying power the sur- 

 face of each tubercle is seen to be made up of a number of secondary 

 scale-like prominences ; the tubercles are not lengthened out transversely to 

 form ridges in any part of the surface ; two of the tubercles on the gastric 



* Galathodes abbreviatus A. M. Edw., Bull. Mus. Comp. Zool., VIII. 55, 1880 ; Munidopsis abhreviata 

 A. M. Edw. et Bouv., Ann. Sci. Nat., Zool., 7'""' Ser., XVI. 275, 1894. 



