196 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



and distal margins ciliated; an approximately median longitudinal 

 groove extends for the proximal five-sixths of the length of the blade. 

 The eyes are cylindrical, the stalks short and broad, directed out- 

 wards; the cornea occupies about one-third of the entire length of 

 the stalk. 

 Synonymy. — Chalaraspis unguiculata Willemoes-Suhm, Trans. Linn. 



Soc. London, ser. II, vol. I, pt. 1, pp. 37-40, pi. 8, 1875 (part). 

 Eucopia australis G. 0. Sars, Rept. Voy. "Challenger," Zool., vol. 13, 



p. 55, pis. 9 and 10, 1885. 

 Eucopia unguiculata H. J. Hansen, Bull. L'Inst. Oceanog. Monaco, 



No. 42, p. 3 (42), 1905; Siboga-Exped. Sergestidae, mon. 38, p. 



20, pi. 1, fig. 3a, 1910, Leiden. 



Family: EUPHAUSIIDAE. 



Genus: NEMATOSCELIS G. 0. Sars. 



Nematoscelis megalops G. O. Sars. 



Plate 74. 



Material examined: Twelve specimens, two of which are oviger- 

 ous, taken with the dredge down 900 fms., 10 miles S. by E. of Monaco 

 Harbor, Mediterranean Sea, April 19, 1927, by the "Ara." One speci- 

 men, taken with dredge down 300 fms., 50 miles S. "W. of Cape Malo, 

 Panama, March, 1928. 



Type : This species, which is type of the genus, was founded upon 

 material taken by the '^ Challenger" at stations 332 and 333, in the 

 South Atlantic, in abundance at the surface. The type is deposited 

 in the British Museum. 



Discussion: This species has been so repeatedly taken in schools 

 that it seems correct to classify it as a gregarious form. It is found at 

 or near the surface and has also been taken at great depths. This 

 species has been exhaustively described by G. 0. Sars in the "Chal- 

 lenger" Report. The four outstanding diagnostic characters of N. 

 megalops are: (a) The prodigious development of the eyes, which are 

 irregularly globose with the cornea sharply contracted in the median 

 region, (b) The unusually narrow and curved rostrum, (c) The 

 slender form of the antennal scale, (d) The extraordinary length of 

 the first pair of legs, which are unusually elongate, attaining, when 

 fully extended, the whole length of the body ; the merus reaching far 

 beyond the distal end of the antennular peduncle, the propodal joint 

 a little sharper than the carpal, the dactyl very minute. 



