402 A. E. Verrill — Decapod Crustacea of Bermuda. 



The frontal horns in cornittiis are rather larger and straighter 

 than in the other, and the subrosti'al process, between the antennulae, 

 is narrow and directed strongly backward, while in the other it is 

 wider, thick, and nearly perpendicular, with an acute, exciirved tip. 



The buccal area has the anterior, lateral sinuses more strongly 

 arched in 31. cornutus, and the corresponding parts of the outer 

 raaxillipeds are, therefore, more convex. 



There are other distinctions that might be noticed, but the wide 

 difference in the tips of the legs is the most convenient diagnostic 

 character. 



In M. cornutus the ratio of the proximal vertical diameter of the 

 propodus of first pair of ambulatory legs to its length is 1 : 4.5 to 1:5; 

 of the dactylus, 1:6. In M. spinosissimus the corresponding ratios 

 are 1 : 3 and 1 : 4. 



The propodus in the latter is strongly compressed and decidedly 

 tapered, but in 31. corjiutus it is scarcely compressed, and not 

 tapered, the distal end being larger than the middle and about equal 

 to the proximal end ; its dactylus is also less curved and the tip 

 very slender. 



The color of 31. cor7iutiis in life is bright red above, lighter below; 

 when recently dried it soon changes to pale red, yellowish red, or 

 terra-cotta color, b}^ exposure to light. 



Measurements. 



, Car apac e n 



total length breadth Chelfe 



Sex length — rostum total — spines, length height 



4069 S 64 58 ' 62 53 46 13 Dominica 

 453 F.M. $eggs 29 26 25.5 22 14 4 Bermuda 



4070 $eggs 68 59 60 52 33 8 Dominica 



In No. 4069 the merus of chelipeds is 35""™ long ; greatest thick- 

 ness, without spines, 9°"" ; merus of first arab. leg, 28'"" ; thickness 

 in middle, 6""" ; its propodus, length, 21™'" ; thickness, 4.5 ; dac- 

 tylus, 18'"™ ; proximal diameter, 3'^™. 



M.-Edwards gives for his largest {^) specimen : length of cara- 

 pace, 92™™ ; breadth, 90™™ ; length of chela, 82™™. 



The only specimen known from Bermuda (453 F. M.) was taken 

 October 12, 1905, in 30 fathoms on the Challenger Bank, b}^ the 

 expedition from the Field Museum of Natural Histor}'. It is a 

 small and evidently young female, but it carried a considerable mass 

 of eggs. 



