128 Bulletin, Vanderbilt Marine Museum, Vol. Ill 



fms., at several stations in the western Atlantic between 31° 41' 0" N. 

 Lat. and 39° 55' 0" N. Lat. ; deposited in the Museum of Comparative 

 Zoology. 



Distribution : Bathypelagic in the North Atlantic on both Ameri- 

 can and European coasts ; also in the Mediterranean Sea. 



Material examined : Two specimens, dredged in 400 fms,, bottom 

 depth 500 fms., St. Raphael, bearing S. S. E., distance 9 miles, south 

 of France, Mediterranean Sea, March 23, 1927, by the ''Ara." 



Color: In life the adults are spectrum red, with purplish-blue 

 markings on the mouth-parts; the preadult stages are less colorful, 

 having only the anterior half of the body red. 



Discussion : This species has been fully described by S. I. Smith 

 and more recently by E. L. Bouvier, who has also given us a color- 

 plate of the species. Stanley Kemp's excellent figures, made from 

 specimens taken off Ireland, fully establish the presence of this species 

 on both sides of the Atlantic. 



Gennadas elegans is readily distinguished from other members of 

 the genus by : the distance dorsally between the cervical and post- 

 cervical groove is approximately one-sixth of the distance between the 

 postcervical groove and the hinder margin. The antennal angle is 

 prominent, acute ; the lower antennal spine is acute with the apex 

 blunted; the branchiostegal spine is small. The second peduncular 

 joint of the antennae is dorsally only half as long as the third joint. 

 The scaphocerite is about three times as long as wide, with the outer 

 margin convex ; a subdistal, acute spine which does not extend as far 

 forward as the convex distal margin of the blade. In the second 

 pair of legs the chelae are shorter than the carpus ; in the third pair 

 of legs the merus is elongated, a little longer than the carpus, and the 

 chelae are only three-fifths as long as the carpus. The abdominal seg- 

 ments are all smoothly rounded dorsally, except the sixth segment, 

 which is carinated. The thelycum and petasma are also diagnostic. 

 (See figures of these by Kemp.) 



Synonymy. — Amalopeneus elegans S. I. Smith, Bull. Mus. Comp. 

 Zool., vol. X, p. 87, pi. 14, figs. 8-14, pi. 15, figs. 1-5, 1882 ; Ann. 

 Kept. U. S. Comm. Fish and Fisheries for 1882, p. 399, 1884; 

 Proc. U. S. Nat. Mus., vol. 6, p. 87, 1885 ; lUd., vol. VI, p. 189.— 

 A. E. Ortmann, Decap. und Schizopod. der Plankton-Exped., 

 Kiel und Liepzig, p. 27, 1893. — Stebbing, T. R. R., A History of 

 Crustacea, London, p. 219, 1893. — Riggio, G., Monit. Zool. Ital., 

 anno XI (suppl.), Roma., p. 19, 1900. — Monticelli, F. S., et 



