34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Euaugaptilus oblongus (Sars, 1905) 



Augaptilus oblongus Sars, 1905b, pp. 11-12. 



Augaptilus rostratus Esterly, 1906, p. 73, pis. 9 (fig. 19), 11 (fig. 42), 12 (figs. 57, 



63), 13 (fig. 75). 

 Augaptilus subfiligerus Wolfeiiden, 1911, p. 343. 



Euaugaptilus oblongus (Sars). — Sars, 1924-1925, pp. 266-267, pi. 81. 

 Euaugaptilus rostratus (Esterly). — Brodsky, 1950, pp. 374-375, fig. 264. 



Remarks: Close examination of two females of Euaugaptilus 

 rostratus (loaned to us by Scripps Institution of Oceanography) on 

 which Esterly (1906) probably based the description of that species 

 indicates that E. rostratus (Esterly) is identical to E. oblongus (Sars, 

 1905). A comparison of the description of Augaptilus subfiligerus 

 Wolfenden, 1911, with E. oblongus (Sars) shows that these two spe- 

 cies are also identical. 



The synonymy of the three species extends the size range of Euau- 

 gaptilus oblongus to 4.65-7.4 mm, 



Euaugaptilus quaesitus, new species 



Figures 204-209 



Occurrence: Station 332 NV, 3000 to 2000 m, 1 9. 



Diagnosis (female) : Head and first thoracic segment separate, 

 fourth and fifth thoracic segments fused. Posterior lateral comer of 

 fifth thoracic segment rounded. Abdomen 3-segmented. Genital 

 segment longer than the two following combined. Rostrum consist- 

 ing of two points, rostral filaments absent. First antenna barely 

 reaching furca. Exopod of second antenna 8-segmented, segments 

 seven and eight incompletely separated ; exopod and endopod of equal 

 length. Mandible blade with two widely separated strong teeth and 

 one slender tooth near the seta. First inner lobe of first maxilla with 

 four spines; second and third inner lobes absent; fused second basi- 

 podal segment and endopod with one seta; exopod with five setae, the 

 two terminal ones largest; external lobe with three setae of equal 

 length. Number of setae on lobes 1-6 of the second maxilla: 2, 2,1, 

 2, 2, 1, respectively. Number of setae on lobes 1-5 of the maxilliped: 

 0, 3, 3, 2, 2, respectively. Exopod of first swimming foot consisting 

 of three segments, endopod of two segments. Exopods and endopods 

 of second through fourth pair of swimming feet 3-segmented. Exopod 

 and endopod of fifth pair 2-segmented. Total length 1.40 mm. 

 Holotype: USNM 113533. 



Remarks: Euaugaptilus quaesitus resembles E. jundatus in the 

 structure of the mandible blade, the first maxilla, and the 2-segmented 

 endopod of the first swimming foot. The two species can be sepa- 

 by the smaller size of Euaugaptilus quaesitus and by its lack of rostral 

 filaments, its shorter first antenna, and its 2-segmented exopod and 



