'59 



t8. Family PoNTELLIDAE. 

 Genus Pontella Dana, 1S46. 



The members of this genus are separated from the other genera belonging to the family, 

 by the three-jointed endopodite of the first pair of feet, by the presence of a pair of dorsal 

 eye-lenses. and by the comparatively short rami of the rostrum. A lens for the ventral eye is 

 occasionally developed in the base of the rostrum. 



Eight species of Pontella were represented in the plankton collected by the 'Siboga' 

 during the investigations in the Malay Archipelago. Four of the species do not appear to have 

 previously been described. 



1. Pontella danae Giesbrecht. 



Pontella danae Giesbrecht, 1889, p. 28. 



Pontella danae Giesbrecht, 1893, p. 461, pis. 24 & 40. 



Pontellnia Ivellina) danae Claus, 1S93, p. 274. 



Pontella danae Giesbrecht, 1S95, p. 260. 



Pontella danae Giesbrecht & Schmeil, 1S98, p. 143. 



Two females belonging to this species were found in the plankton collected at Station 1 1 7 a . 



The specimens appeared to be slightly immature, and the abdomen was covered with 

 the cement for attaching spermatophores to the genital opening. The fifth pair of feet of the 

 two specimens is not quite symmetrical. The exopodite of the left foot is distinctly longer than 

 the exopodite of the right foot. The fifth pair of the 'Siboga' specimens is similar to the fifth 

 pair of Pontella danae var. ceyloniea Thompson and Scott, but the furcal joints are iclentical 

 with Giesbrecht's figure. 



Pontella danae has only been recorded from the Pacific Ocean. 



2. Pontella f era Dana. 



Pontella f era Dana, 1849 (pars), p. 34. 



Pontella f era Giesbrecht, 1893, p. 462, pis. 24 & 40. 



Pontellnia ( Eupontellina) f era Claus, 1893, p. 273. 



Pontella f era Giesbrecht & Schmeil, 1898, p. 144. 



Pontella fera A. Scott, 1902, p. 40S. 



Pontella fera Thompson & Scott, 1903, p. 252. 



Pontella fera Wolfenden, I905(<?), p. 102 1. 



One specimen identical with this species was obtained from the plankton collected at 

 each of the following twelve stations. Six males and six females were tound. 



Stat. 66. — Stat. 71. — Stat. 75 (HEXSEX vertical net, 11 metres to surface). — Stat. 93. — 

 Stat. 109. — Stat. 110. — Stat. 144. — Stat. 203 (surface). — Stat. 205. — Stat. 213. — 

 Stat. 215. — Stat. 282. 



The last thoracic segment of the female is symmetrical and the abdomen is composed 



'59 



