MUNIDOPSIS MARGARITA. 91 



gostomian regions granulated. There is a pair of spines on the second, 

 third, and fourth abdominal segments ; besides these there are several small 

 spinules on the terga and pleurae of these segments ; the pleurae are rather 

 narrow, with rounded lateral angles. The chelipeds are wanting in the 

 unique specimen. The ambulatory appendages are spinulose, the spinules 

 of the dactyli restricted to the hind margin. The eye is provided with a 

 a very minute spine. The antennae are rather longer than the body, the 

 basal joint has a short external spine, a longer one at the lower internal 

 angle, and a smaller one at a higher level on the inner side. The latter 

 spine shows, when the animal is viewed from above, between the eye-stalk 

 and the antenna. The subsequent segments of the antenna are armed as 

 usual in this genus. 



Length, 39 mm. ; length of carapace, 12 mm. ; length of rostrum, 8 mm. ; 

 breadth of carapace, 12 mm. 



Station 3394. 511 fathoms. 1 male. 



Munidopsis margarita Fax. 

 Plate XX., Fig. 2. 



Bull. Mus. Comp. Zool., XXIV. 184, 1893, 



In this species the rostrum has a gentle upward curve near the tip ; it is 

 carinate above, and minutely spinulous on the margins. The surface of the 

 carapace is rough with squamous tubercles and forward-pointed spines. 

 The gastric and cardiac regions are prominent, and separated from one 

 another by a deep depression ; a pair of spines on the gastric region, and 

 one spine on the cardiac region attain a special prominence. A long sharp 

 spine outside the eye forms the outer wall of a well-marked orbit. There 

 are eight spines on each lateral margin, six on the posterior margin (includ- 

 ing those at the postero-lateral angles). The branchial areas are iridescent. 

 Second abdominal segment : the anterior transverse ridge, which is broken 

 down in the centre, bears on each side a prominent hooked spine, which is 

 enlarged at the base, and denticulated on the outer margin ; the posterior 

 ridge is furnished with three hooked spines; the pleurce of this segment bear 

 each a broad, flattened, forward-pointing tooth with denticulated edges; when 

 the animal is viewed from above, this tooth appears to form the lateral ex- 

 tremity of the pleura, which really lies below it and is rounded. Third abdom- 

 inal segment : both ridges are spiny and denticulate, three spines being 



