*35 



edge of the mandible is of the Lucia/ /ia and Disseta type. The furcal joints are asymmetrical, 

 and are similar to those of Disseta and Heterorhabdus. The true place of this 'Incerti Generis' 

 GlESBRECHT and ScHMEIL, is in the genus Disseta. 



The minor differences between the figure of the fifth pair of feet given by Brady, and 

 the illustration given in this report, are probably due to the 'Challenger' specimen having been 

 more mutilated than the one captured by the 'Siboga'. The curious apical joint of the exopodite 

 of the right fifth foot, and the long, stout, sinuous terminal spine on the exopodite of the left 

 fifth foot are quite sufficiënt to make the identity of the 'Siboga' form with Brady's Leuckartia 

 scopularis a matter of very little doubt.- 



Length of 'Siboga' male 9,75 mm. 



The long furcal joints, and the character of the fifth pair of feet, readily separate this 

 male from the male of Disseta • palumboi. 



Brady's type specimen was found in a surface collection taken in the Pacific between 

 Japan and Honolulu. 



15. Family Augaptilidae. 

 Genus Augaptilus Giesbrecht, 1889. 



The members of this genus are closely allied to Haloptilus, but the females can readily 

 be recognised by the segmentation of the abdomen. The abdomen of the females of this genus 

 is composed of three segments. 



Seven species belonging to this genus were represented in the plankton collected in the 

 Malay Archipelago by the 'Siboga'. Two of the species appear to be undescribed. 



1. Augaptilus bullifer Giesbrecht. 



Augaptilus bullifer Giesbrecht, 1889, p. 813. 



Augaptilus bullifer Giesbrecht, 1893, p. 400, pis. 28 & 39. 



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



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



Augaptilus bullifer Farran, 190S, p. 75. 



Specimens of this species were obtained from the plankton collected with the Hensen 

 vertical net at the following stations. 



Stat. 141 (1500 metres to surface), 2 specimens. — Stat. 276 (750 metres to surface). 



Augaptilus bullifer resembles Augaptilus filigerus in general appearance, but it is 

 more robust and the genital segment of the female is quite symmetrical. 



Giesbrecht's specimens of this form were obtained from the Pacific. Farrax has recently 

 recorded it from the North Atlantic. Sars obtained it from the plankton collected by the Prince 

 of Monaco. 



135 



