A. E. Verrill — Decapod Crustacea of Bermuda. 



401 



same number and size on the upper surface ; numerous smaller 

 unequal conical spines are scattered on the upper surface or form 

 broken rows, while the anterior margin bears a row of about five or 

 six obtuse spines, much smaller than those of the other margin ; 

 there is also a row of three or four still smaller ones on the under 

 side. 



In J/, spinosissirniis the spines of the merus are not so numerous, 

 but larger, longer, more equal, more curved and very acute and bear 

 rough, divergent stiff hairs ; about ten to twelve large, nearly equal 

 spines stand on the posterior border ; two or three large and some 

 small ones on the anterior border ; the upper surface bears about 

 six large spines and a few very small ones ; the largest are distally 

 situated and some of them are larger than the marginal ones ; there 



Figure 38. — Mithrax cornutus, from Bermuda ; young with eggs, about ,% uat. 

 size. Phot. A. H. V. 



is a row of about three short spines on the under side ; the carpus is 

 also covered with numerous (about twenty-five to thirty) very 

 unequal, very acute, divergent spines, some on the inner edge as 

 large as those of the merus. 



In 31. cornutus the carpus bears rather more numerous spines, but 

 they are mostly smaller and less acute, more than half of them 

 being mere conical tubercles. 



The manus in this species bears two distinct rows of eight to ten 

 spines on the upper edge, which is not much compressed ; these 

 spines are short and obtuse. 



In M. spinosissiynas the dorsal spines of the manus, of which 

 there are about eight to ten, form a single zigzag row ; they are also 

 longer and usually more acute, but in large specimens often become 

 blunt. The dorsal part of the manus is strongly compressed. 



