Boone, Crustacea, Cruise of "Alva," 1931 143 



Material examined: Three specimens, collected in coral, 

 Falcon Island, Palm Islands, Queensland, October 7, 1931, by the 

 "Alva." 



Technical description: Rostrum dorsally carinate, arising 

 slightly posterior to the orbital lobe and projecting two-sevenths 

 of its length beyond the carapace, the acuminate apex extending 

 as far forward as the distal margin of the first peduncular article 

 of the antennulae. The orbital lobes are separated from the ros- 

 trum on each side by a deep, wide sulcus that extends as far back 

 as the lobes, which are large, convex, devoid of a spinule but with 

 a minute angulation of the frontal margin when viewed in profile ; 

 the black corneal area is large, spherical. 



The carapace is moderately compressed laterally, evenly 

 rounded dorsally ; length, 13 mm., including the rostrum ; rostral 

 projection beyond the carapace, 1 mm. long; entire rostrum, 3 mm. 

 long. 



The abdominal terga are smooth, evenly rounded ; the telson is 

 almost one-fourth longer than the preceding segment ; the distal 

 margin truncate, evenly rounded, setose ; the dorsal surface even- 

 ly rounded, smooth, armed with two pairs of submedian, articu- 

 lated spinules in longitudinal series ; the proximal pair being not 

 quite half-way the telsonic length from the basal margin ; the 

 second pair being situated half-way between this and the distal 

 margin. The peduncle of the uropoda is distally bilobate, pro- 

 duced to an acuminate lobe about the base of the inner blade and 

 an even more acuminate, spinose lobe above the outer branch. 

 Both blades are quite broad distally, the outer blade being a little 

 the wider and more convex distally, with a small, subdistal den- 

 ticle on the outer lateral margin and a strong transverse suture 

 extending inward from this point ; the inner blade is rather trun- 

 cated distally and shallowly rounded ; both are subequal in length 

 to the telson and fringed with web-like setae. 



The antennulae have the stylocerite lobate, acuminate, rather 

 wide proximally, with the outer margin convex, the inner margin 

 convex proximally, slightly concave distally, the apex acute, ex- 

 tending as far as the distal margin of the first peduncular seg- 

 ment, as does also the rostrum. The second antennular article 

 is one and two-thirds as long as the first; the third article one- 

 half as long as the second; all three joints are much beset with 

 long setae on the upper surface ; the flagellum has the short branch 



