VANADIS. 133 



but still distinctly proximad of the middle of the ncuropodium. Each is ovate 

 in outline, with the tip rounded excepting in the very small anterior ones, in which 

 it is acute. (Plate 24, fig. 7-9). 



The setae are very long, fine, and transparent, with the distal pieces slenderly 

 acute. (Plate 24, f. 6). - . 



Locality. Between Callao, Peru and Easter Island: Sta. 4680 (lat. 

 17° 55' S., long. 87° 42' W.). Surface. Surface temp. G8° F. 7 December, 

 1904. Three fragments. 



Between Easter Island and the Galapagos: Sta. 4700 (lat. 20° 29' S., long. 

 103° 26' W.). Surface. Surface temp. 74° F. 25 December, 1904. Several 

 specimens. 



As compared with A. Candida Claparede, the type of the genus, and thus 

 far only known from the Mediterranean, this species differs conspicuously in a 

 number of characters. The proboscis possesses no tubercles about the opening, 

 such as are so well developed in Candida, while the prehensorial processes or 

 prongs are much longer. The median tentacle is long and slenderly cylindro- 

 conical, instead of blunt and button-like. The notocirri and neurocirri are 

 markedly different in form and relative size. 



Vanadis Claparede. 



Ann^lides Chetop. Golfe Naples, Suppl., 1870, p. 116; Greeff, Nova acta Acad. Cacsareae Loop.- 

 CaroL, 1876, 39, p. 56; Apstein, Ergebn. Atlant. Ocean * * * Plankton- exped., 1900, 2, H. b., p. 8. 



The species of this genus may be separated by means of the following key : 



Key to Species. 



a. With only three pairs of tentacular cirri. 



b. Median antenna attached nearly at level of anterior border of eyes; lenses of eyes directed 

 lateroventrally, not visible from above. 

 c. Eyes dorsally separated; ventral paired tentacles longer than the dorsals. 



V. minula Treadwell. 

 cc. Eyes in contact dorsally; ventral paired tentacles shorter than the dorsals. 



V. grandis Tzuka. 

 bb. Median tentacle attached nearly on a level with the middle of eyes. 



c. Body colorless or but weakly tinged V. formosa Claparede. 



cc. Body distinctly colored, deep violet-brown V. violacea Apstein. 



aa. With more than three pairs of tentacular cirri. 

 b. With four pairs of tentacular cirri. 



c. Head deeply incised between the eyes V. studeri Apstein. 



cc. Head without such incision between the eyes. 



d. Optic lenses directed laterad V. crystallina Greeff. 



