Boone, Crustacea, Cruise of "Alva," 1931 183 



The third, fourth and fifth pairs of ambulatory legs are suc- 

 cessively moderately shorter in the order named; each has the 

 basis and ischium short, substantial; the merus elongate, about 

 three times as long as the related ischium ; the merus is about 

 two-fifths as wide as long, dorsoventrally compressed ; the carpus 

 is one-half as long as the merus, more cylindrical ; the propodus 

 is similar to the carpus but is subequal in length to the merus; 

 the dactyl is very short, its greatest length about one-sixth of that 



Text figure 12 — Coralliocaris tahitoei, new species, three views of dactyl of 



third leg: upper, lateral profile, middle, ventral view, lower 



view, three-quarters profile ; all greatly enlarged. 



of the propodus and with the two lateral margins converging to 

 form a thickish triangulate tip, which is slightly incurved ; on the 

 upper outer flattish surface of this triangle there is a very strong 

 upstanding, procurved, acuminate hook, the tip of which is bent 

 downward. Viewed ventrally this triangle is a blunted, thickened 

 ridge. There are no other supplementary spinules on the dactyl. 

 Likewise, there are no articulated spines present on the inferior 

 lateral margin of the propodus of the present species ; the ambula- 

 tory legs being typically Coralliocaris. (See text, fig. 12) . 



The external maxillipeds are very slender. The exognath is 

 tapered, slender, setose, and extends almost to the distal margin 

 of the second article of the endognath. The first joint of the en- 

 dognath is slightly longer than the related two succeeding joints 

 and is nearly four times as long as its median width ; the second 



