206 Bulletin Vanderbilt Marine Museum, Vol. VI 



this outer carina, on the outer lateral surface of this third joint, 

 there is a third carina, short, extending only the proximal half 

 of the joint, thinner than the dorsal carina and terminating 

 distally in a rounded denticle, immediately beyond which there is 

 a constriction, followed distally by a second, submarginal denticle. 

 The distal dorsal margin of the third joint is sinuate, with a small, 

 acute process at the outer distal angle. (Plate 57, fig. A) . 



The specialized male first pleopod has the outer blade of the 

 usual shape but armed with two well separated, small, acute, ar- 

 ticulated spines on the outer lateral margin. The inner organ is 

 complex, tubular, the outer lobe being irregularly oval, narrowed 

 proximally, concave on the posterior lateral surface, bearing dis- 

 tally midway the margin a group composed of four long, fishhook- 

 like setae and two upright setae ; the median lobe has a distinctive, 

 eccentric tubular formation, its lateral outline being curiously 

 sinuate, tapered distally, even when the organ is unrolled, the side 

 margins of this median lobe remain curved over inward, tube-like ; 

 there is a small, tapered, distally curved lobe, obscurely placed 

 between the outer and median lobes; the terminal process (p. 2) 

 is shorter by half than the proximal process (p. 3), both termi- 

 nate distally in curved, hook-like formations. The lateral process 

 (p. 4) is rather short, triangulate, acuminate. (Plate 57, fig. C). 



The second male pleopod also has the inner blade specialized, 

 being semitubular, with the posterior lateral surface concave, the 

 distal end consisting of two rounded processes ; the inner lateral 

 margin is produced in a separate, elongate-ovate lobe about mid- 

 way its length, more proximally; this same lateral margin has 

 another small lobed incision. (Plate 57, fig. D). 



I have associated the name of the yacht "Alva" with this 

 species. 



Euphausia consuelae, new species 

 Plates 58 and 59 



Type : The type series consists of thirteen specimens, includ- 

 ing both male and female adults, dredged in 250 fathoms, off Ame- 

 tejum Island, New Hebrides, September, 1931, by the "Alva." 



Distribution: Bathypelagic, in the Pacific Ocean, off New 

 Hebrides. 



Material examined: Type series. 



