263 



The fourth joint is as long as the combined length of the last three joints (Plate LXVIII, fig. 2). 



The antennae are short and three-jointed. The apex of the third joint is armed with 

 three moderately strong claws and tour short setae (Plate LXVIII, fig. 3). 



The mandible consists of two long slender stylets. The upper stylet has a scrrated 

 outer margin. The upper margin of the inner stylet is fringed with short hairs. The mandible 

 is also furnished with two digitiform processes (Plate LXVIII, fig. 4A). 



The maxillae are lamelliform and attached to the base of the mandibles. The apex is 

 excavated in the middle. The upper part is rounded and bears two short hairs. The lower 

 portion is toothed and is armed with one moderately strong seta, and two very small setae 

 (Plate LXVIII, fig. 4 B). 



The second joint of the first pair of maxillipedes has a stylet-shaped termination which 

 is armed with strong and slightly curved spines on the upper margin. The basal joint is 

 moderately large (Plate LXVIII, fig. 5). 



The second pair of maxillipedes is small and two-jointed. The second joint is elongate 

 and terminates in a narrow apex carrying two small spines (Plate LXVIII, fig. 6). 



The exopodites and endopodites of the first four pairs of feet are three-jointed. 



The fifth pair of feet is elongate ovate in shape. The upper margin is arched. The 

 distal end is furnished with four setae. The lower margin is nearly straight. The middle of 

 the upper margin and the distal end of the lower margin, is fringed with fine short spines 

 (Plate LXVIII, fig. 9). 



Male — length 2,45 mm. 



The male resembles the female in general appearance, but the abdomen is composed 

 of five segments. The second pair of maxillipedes is furnished with a very powerful curved claw. 

 The claw is longer than the second joint (Plate LXVIII, fig. 7). 



This species can readily be recognised by the very rounded form of the ccphalothora.x , 

 by the shape of the fifth pair of feet, and by the proportional length of the abdominal seg- 

 ments and furcal joints. 



Occurrence. — Two females and eight males were obtained from the plankton col- 

 lected with the Hexsen vertical net at Station 230, from a depth of 2000 metres to the surface. 



Genus Lichomolgus Thorell, 1859. 



The mandibles and first pair of maxillipedes of the members of this genus are stylet- 

 shaped. The endopodite of the fourth pair of feet is composed of two very unequal joints 

 and is considerably shorter than the exopodite. 



The two-jointed endopodite of the fourth pair of feet is the most important character 

 by which the members of this genus can be recognised. 



Five species were represented in the material collected during the traverse of the 'Siboga'. 

 Two of the species do not appear to have previously been described. 



1 . Lichomolgus buddhensis Thompson & Scott. 



Lichomolgus buddhensis Thompson & Scott, 1903, p. 279, pi. XV, figs. iS — 24. 



263 



