136 



2. Augaptihis filigerus (Claus). 



Hemicalanus filigerus Claus, 1863, p. 179. 



Augaptilns filigerus Giesbrecht, 1893, p. 400, pis. 3, 27, 28, 29 & 39. 



Augaptihis filigerus Giesbrecht & Schmeil, 1898, p. 121. 



Augaptilns filigerus I. C. Thompson, 1903, p. 28. 



Augaptilus filiger Sars, 1905 (b), p. 4. 



Augaptilns filigerus Farran, 190S, p. jj. 



Augaptilns filigerus van Breemen, 1809, p. 133, fig. 150. 



One specimen belonging to this species was found in the plankton collected with the 

 Hensen vertical net at each of the following stations. 



Stat. 118 (900 metres to surface). — Stat. 141 (1500 metres to surface). — Stat. 143 (1000 

 metres to surface). ■ — Stat. 148 (1000 metres to surface). — Stat. 276 (750 metres to surface). 



Augaptilus filigerus can be separated from the other members of the genus, by the 

 proportional length of the abdominal segments and furcal joints. The second and third segments 

 of the abdomen are of about equal length. The furcal joints are slightly longer than broad. 

 They are as long as the anal segment. 



This species was originally obtained from the Mediterranean by Claus. It has since 

 been recorded from the Xorth Atlantic. 



3. Augaptilus hecticus Giesbrecht. 



Augaptilus hecticus Giesbrecht, 1889, p. 814. 



Augaptilus hecticus Giesbrecht, 1893, p. 400, p!s, 1, 27, 28, 29 & 39. 



Augaptilus hecticus Giesbrecht & Schmeil, 1898, p. 122. 



Augaptilus hecticus I. C. Thompson, 1903, p. 29. 



Augaptilus hecticus van Breemen, 1908, p. 135, fig. 153. 



One specimen of this Augaptilus was found in the plankton collected with the Hensen 

 vertical net at each of the two following stations. 



Stat. 141 (1500 metres to surface). — Stat. 276 (750 metres to surface). 



This species is a comparatively small one. It can be distinguished by the proportional 

 length of the abdominal segments and furcal joints. The second and third segments of the 

 abdomen are of about equal length. The furcal joints are as long as the anal segment. They 

 are three times longer than broad. 



Augaptilus hecticus has a moderately wide distribution. It has been recorded from the 

 Atlantic and Pacific Oceans and from the Mediterranean. 



4. Augaptilus longicaudatus (Claus). 



Hemicalanus longicaudatus Claus, 1863, p. 179, pi. XXIX. 

 Augaptilus longicaudatus Giesbrecht, 1893, p. 400, pis. 27, 28, 29 & 39. 

 Augaptilus longicaudatus T. Scott, 1893, p. 34, pis. I & II. 

 Augaptilus longicaudatus Giesbrecht & Schmeil, 1898, p. 123. 

 Augaptilus longicaudatus I. C. Thompson, 1903, p. 29. 



1*6 



