DISCOVERY REPORTS 



directed current towards the mouth as in Chirocephalus, but it is impossible 

 the water moving forwards on either side without the central mass of water 

 the same direction. Of course this would not apply if there were not the 

 space ventrally between the hmbs. 



to imagine 

 moving in 

 wide open 



ROSTRUM 

 FYF 1 



■ ' ANTENNULE 



ANTENN, 



MAMLLULE 



PARAGN'iTH 



FIRST 

 'TRUNK LIMK 



EPIPODITE 



Fig. 5. Nebaliopsis typica. 



A. Diagram of hypothetical curved frontal section passing through all the head and trunk limbs, to show the 

 constitution of the filter apparatus and the arrangement of setae on the posterior trunk limbs. (For 

 comparison with Nebalia, Text-fig. i, Cannon, 1927, p. 357.) 



B. Sketch to show suggested water currents. 



C. Median and ventral views of seventh trunk limbs to show musculature. 



This current will be greatly increased, as I shall describe below, by the activity of 

 the maxilla and first trunk limb. Any food particle carried on it will be retained in the 

 median space by the filter walls, just as in the case of Nebalia. As a limb moves back- 

 wards and so increases the inter-limb space in front of it, there must be a slight suction 



