Boone, Crustacea, Cruise of "Alva," 1931 111 



the rostrum, extending as far as the seventh inferior rostral spine, 

 or about six-sevenths of the rostral length, with the outer lateral 

 margin thickened, nearly straight, terminating in an acute tooth 

 that extends beyond the distal margin of the inner portion; the 

 inner blade is widest about the proximal fourth, where it is con- 

 vex, and from which point it narrows distally and is bluntly and 

 very slightly obliquely truncate, the margins are ciliate ; the re- 

 maining peduncular articles are thick, cylindrical, extending two- 

 fifths of the length of the scaphocerite ; the flagellum is broken. 



The mandible has the cutting edge dentate ; the incisor process 

 is absent ; the palp is composed of three joints. 



The first legs are apparently equal in the present specimen, 

 an adult female, although the carpal and propodal articles on one 

 are broken off. The ischial joint is produced to a subacute process 

 on the inferior distal margin, extending two-fifths of the lower 

 margin of the merus ; the merus is clavate, narrowed proximally, 

 two-thirds as long as the propodus and finger, very slender, with 

 a subacute dorsal denticle distally; the carpus is three-fourths 

 as long as the merus, more substantial, laterally compressed and 

 produced dorsally into a carina, which forms a strong, subdistal 

 acute, triangulate tooth ; the palm is much compressed laterally, 

 smooth, as long as the carpus and one-half as high as long ; the 

 fingers are three-fifths as long as the palm, meeting only at the 

 tips, which are black, horny, tridentate ; the fingers are separated 

 by a wide oval gape ; the cutting edge of each finger is a concave 

 trough, distally terminating in three black teeth ; there is in this 

 trough, about three-fifths of the length from the base, an acute, 

 black, spine-like tooth, directed straight upward and opposed to 

 a similar tooth from the opposite finger. 



The second pair of legs are extremely slender, with the ischium 

 nearly subequal to the merus ; the carpus is one and three-fifths 

 times the length of the merus ; the propodus, including the dactyl, 

 is two-thirds as long as the carpus ; the palm is slender, much com- 

 pressed laterally, the fingers being one-fourth of the total length, 

 very feeble, meeting throughout their entire length, with the tips 

 black, horny, rounded and fringed with setae. 



The first, second and third pairs of ambulatory legs are excep- 

 tionally slender, thin, stick-like, long, decreasing in length in the 

 order 1, 2, 3. The second right leg measures as follows: Ischium, 

 1 mm. long; merus, 4 mm. long; carpus, 2 mm. long, and with a 



