226 



FISHERY BULLETIN OP THE FISH AND WILDLIFE SERVICE 



Augaptilus longicaudatus (Claus, 1863) 



(Plate 26, figs. 6-14) 



Pacific records: Esterly, 1905; Scott, 1909; Farran, 

 1929; 1936; Wilson, 1942; Brodsky, 1950; Wilson, 

 1950; Tanaka, 1953. 



Vessel : Station Occurrence 



Hugh M. Smith __ 94 1 female, 3.60 mm. 



Remarks : The asymmetrical genital segment 

 (fig. 6), mandibular dentition (fig. 8), and 

 structure of the fifth feet (fig. 14) will identify 

 the female. No males were observed in the 

 present collections. 



Euaugaptilus heclicus (Giesbrecht, 1889) 



(Plate 26, figs. 15-17) 



Pacific records: Farran, 1929; Wilson, 1950; Tanaka, 

 1953. As Augaptilus hecticus; Scott, 1909. 



Vessel : Station Occurrence 



Hugh M. Smith __ 31 2 females, 2.70 mm. 



Stranger 34 1 female, 2.28 mm. 



Satsuma 32 1 female, 2.38 mm. 



Remarks: The very long genital segment 

 (fig. 15), claw-like mandibular blade (fig. 16) 

 and the 2-segmented exopods of the fifth feet 

 (fig. 17) serve to identify this species. 



Family ARIETELLIDAE 



Arietellus setosus Giesbrecht, 1892 



(Plate 27, figs. 1-4) 



Pacific records: Esterly, 1905; Scott, 1909; Esterly, 

 1911; Farran, 1929; Johnson, 1942; Wilson, 1942; 

 Brodsky, 1950; Wilson, 1950. 



Vessel : Station 

 Hugh M. Smith __ 63 



Occurrence 

 1 male, 3.99 mm. 



Remarks: The posterior thoracic margins 

 are widely divergent (figs. 1, 3) and the fore- 

 head terminates in an acute point (fig. 2) . Only 

 the male has been found in the present samples. 



Arietellus gieshrechti Sars, 1905 

 (Plate 27, fig. 5) 

 Pacific records: Wilson, 1950; Tanaka, 1953. 



Vessel : Station 



Hugh M. Smith __ 29 __ 



Occurrence 

 1 male, 4.75 mm. 



Remarks: In the male the left posterior 

 thoracic margin is slightly longer than the 

 right. The fifth feet, shown here (fig. 5), are 

 also diagnostic. No females were observed. 



Arietellus plumijer Sars, 1905 

 (Plate 27, figs. 6-10) 

 Pacific records: Wilson, 1950. 



Vessel : Station Occurrence 



Hugh M. Smith 94 1 juvenile female. 



Do 63 1 female, 5.51 mm. 



Remarks : The posterior margins of the 

 thorax are symmetrical and turned upward 

 (figs. 6, 7, 9), and the head has a small point 

 (figs. 7, 8). No males were found. 



Arietellus aculeatus (T. Scott, 1894) 

 (Plate 27, figs. 11-14) 



Pacific records: Scott, 1909; Farran, 1929; Wilson, 

 1950. 



Vessel : Station Occurrence 



Hugh M. Smith 63 1 juvenile female, 



4.08 mm. 



Remarks: The forehead is produced into a 

 long point (fig. 11). The posterior thoracic 

 margins are asymmetrical and the spinous pro- 

 trusion of the right side is more divergent and 

 longer than the one on the left (figs. 11, 13). 



Farran (1929) has suggested that A. arma- 

 tiis Wolfenden, 1911 is probably a synonym of 

 A. aculeatus. Wilson (1950), however, recog- 

 nized armatus as a valid species and redescribed 

 both sexes. 



