MUNIDOPSIS HYSTRIX. 89 



border of the carapace is ornamented with six (in one specimen seven) 

 spines. There are also several spines on the sides of the carapace below 

 the epimeral suture. There is a very small spine over each eye. The an- 

 tennae are shorter than the body, the first joint bears a long external spine, 

 the second joint two lateral spines, the third joint two lateral spines and one 

 superior. The chelipeds are long and slender, the merus and carpus have no 

 long spines, the propodite carries four spines on the upper edge and several 

 rudimentary spinules ; the fingers are spinulose, their cutting edges straight 

 and denticulated. The ambulatory appendages have spiny meri and carpi, 

 the longest spines being one at the distal superior border of each of these 

 joints. The second, third, and fourth abdominal terga bear four spines each, 

 and the pleurre of the second abdominal somite carry a few spinules. The 

 abdominal pleurre are rounded. 



Length, 23 mm. ; length of carapace, 12.4 mm. ; breadth of carapace, 

 8 mm. ; length of rostrum, 4.5 mm. 



Station 3389. 210 fathoms. 1 male, 1 fem. 



This species bears a general resemblance to M. ennacea (A. M. Edw.) and 

 M. spinifera (A. M. Edw.). It differs from both of these in having a flatter 

 carapace marked by a deeper transverse depression across the cardiac area ; 

 in having a larger number of spines on the sides of the carapace; in the pres- 

 ence of spines on the pterygostomian regions, and a small but distinct spine 

 over the eye. It also has strong spines on the superior edge of the hand 

 which are wanting in M. erinacea and M. spinifera. In the possession of three 

 pairs of gastric spines it agrees with M. spinifera, but differs from M. erinacea. 



Munidopsis hystrix Fax. 

 Plate XIX., Fig. 1, 1". 



Bull. Mus. Comp. Zool., XXIV. ]S3, 1S93. 



Carapace setose and thickly covered with small spinous tubercles ; three 

 spines of special prominence on the gastric area disposed in the form of a 

 triangle, Avith apex directed backward ; one on the cardiac area ; two (rarely 

 six) on the hind margin of the carapace ; one on each branchial area. There 

 is a spine at the external angle of the orbit, and the lateral margin of the 

 carapace is spinose. The rostrum is long, lightly curved upward from the 

 base to the tip, and armed with from two to five spines on each side ; the?e 

 spines are imsymmetrically arranged on the two sides The second, third, 



