350 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



The fourth pair of pereiopods (Fig. 48) eud iu short bifid dactyles, the teriuiual claw bearing 

 a shorter proximal one below. The propodus is superficially segmented into from five to seven 

 rings, which vary in size. The right propodus may have five rings, the left seven. The carpus is 

 articulated into ten to twelve segments, commonly twelve, of variable or equal size. The fifth 

 pair of pereiopods is similar to the fourth, but shorter. The propodus bears from six to seven seg- 

 ments, the carpus from eight to twelve. In the fourth and fifth thoracic legs the number of 

 rings into which the propodus and carpus are divided difter within the above limits in difl'erent 

 individuals of either sex and on the right and left sides of the same individual. The pleopods are 

 all biramous, excepting the first pair, in which the endopodite is suppressed as shown iu Fig. ii. 

 This pair of appendages is much smaller in the male. In the female the first swimmerets are 

 nearly as long as the following pairs and are fringed with long setae. 



Measurements (in millimeters). 



[Locality: Nassau, New Providence, Bahama Islands.] 



Sex - 



Length from tip of rostrum to end of telson 



Length of carapax, including rostrum 



Greatest breadtb, including spines 



Greatest depth, including spines 



Length of rostrum 



Distance between transverse furrow and tip of rostrum 



Length of first abdominal tergum 



Length of second al)dominal tergum 



Length oftliinl abdominal tergum 



Length oi loiutli abdominal tergum.. 



Length of fifth abdominal tergum 



Length of sixtli abdominal tergum 



Length of telson 



Gratest breadth of telson 



Length of «,ve-stalk 



Greatest diameter of eye 



Breadth between eyes 



Stalk of inner antenn;e 



Length of terminal segment of the same 



Length of inner fiagelliim of tlie same 



Length of outer fiagelluni of the same 



Length of sea le of outer autennie 



Greatest breadth of the same 



Length of stalk of outer anteuuie 



Breadth of stalk oi outer antenn* 



Length ot ilagellnm of outer anteMuse 



Bre.adth of llagellum of same at inner end 



Length of Ihiid maxilliped 



Length of terminal joint of the same 



Length uf basal joint of the same 



Breadth of basal joint of the same..l 



Length of exopodite of the same 



Length of first pereiopod 



Length of propodus of same 



Breadth of propodus of same 



Length o£ daetyle of same 



Length of cari>us of same 



Length of second pereiopod 



Length of propodus of same 



Length of dactyle of same 



Breadth of i)ropodus of same 



Length of carpus of same 



Length of meros of same 



Length of left third pereiopod 



Length of chela 



Greatest breadth of same with spines 



Greatest depth of same with spines 



Length of dactyle 



Width over tooth of dactyle 



Linglh of carpus of sam« 



Greatest lireadth of carpus without spines 



Greatest breadth of carpus with spines 



Length of meros of same 



Length of right third pereiopod 



37 

 14. 



8 



:! 

 a. 



4. 



8 



3 

 :{ 



M 

 6. 



45 

 1 



73 



75 

 it 

 1. 

 1. 

 1. 



9-J 

 0. 



18. 

 •2. 

 5 

 1 

 5 



20 



6 



27 

 6, 

 3 

 1. 

 9 

 7 

 48 

 19 

 5 

 3 

 7 



a. 



9. 



3 



4 



U 



46 



i. 5 



43 

 16 

 10 

 10 



10 

 1.5 

 3 



5. 5 

 3 

 3 



5.5 

 9 

 4 



7 

 3 

 •> 



11 



8 

 53 

 22 



6 



4 



9 



2.5 

 12 



3 



4 



12 

 51 



44 



44 



40 



86 



98 



119 



