Boone, Crustacea, Cruise of "Alva," 1931 55 



proximally an acute large, forward-directed tooth and extends about 

 three-fourths the length of the palm where it terminates in a second, 

 acute tooth; the fourth costa defines the inner upper margin of the 

 palm and bears a strong, acute, forward-directed spine placed a little 

 anterior to midway its length and a second, similar strong spine dis- 

 tally. The fifth costa occurs midway the inner surface of the palm, 

 giving it a swollen appearance and terminating at a point between the 

 fingers. The fingers are almost as long as the palm, slender, curved, 

 with the tips overlapping; the cutting edges of both are set with a 

 series of alternating large and smaller triangular teeth which interfit 

 with those of the opposing finger. The upper finger is deeply grooved, 

 having six longitudinal costae, three being on the outer and three on 

 the inner lateral surface, while the lower finger has four costae, two 

 being on the outer and two on the inner lateral surfaces. 



The second, third and fourth pairs of legs are slender with long 

 tapered dactyli; the propodus of each leg being channelled with one 

 longitudinal sulcus ; the dactyl of each has two longitudinal sulci and 

 three carinae on its inferior lateral face, while there are two carinae 

 separated by one sulcus on the related upper face. Both propodi and 

 dactyli have their lateral margins setose, the setae being longer on 

 the inferior lateral margin. The fourth pair of legs are definitely 

 smaller than the others. 



The fifth pair of legs are natatory, the meral joint being stocky 

 and having an acute spine at its posterior distal angle ; the carpus is 

 also thick; the propodus and dactyl are foliaceous, suboval with 

 setose margins. 



The eye is large with a short, granular stalk that is produced in a 

 rounded process on the dorsal surface of the cornea; the cornea is 

 large, rounded, black, filling the outer two-thirds of the orbit. 



The antennulae are large and fold obliquely transversely within 

 the f ossett which is divided by an interantennulary septum. 



The antennae have the basal article large and produced at its outer 

 distal angle into a lobe that lies within the orbital sinus; the second 

 and third peduncular articles are successively smaller; the flagellum 

 is fine and threadlike, multiarticulate, about one and one-third times 

 the length of the orbit. 



The external maxilliped has the ischium large; with its inner 

 lateral margins receding distally; the merus is about two-thirds as 

 long as the ischium and has the inner lateral margin sinuate, receding 



