ECOLOGY— DEPTH DISTRIBUTION 



179 



0- 

 I0D- 



200- 

 300- 



^400 



a: 



500- 



F600- 



700- 



800- 



900- 



1000 -I 

 Fig. 5. Depth distribution of Pneumodermopsis paucidens at the day-time station WS 996. 



T.AC. 



■ME. 



DID. 



IOm. 



Fig. 6. Pneumodermopsis paucidens. The animal viewed from the right side, with the buccal apparatus fully extended. 

 BA., row of basal suckers; BR., gill; CIL., posterior ciliated circle; DIG., area of digestive gland; GON., gonad; HS., hook- 

 sac; LA., lateral lobe of foot; L.i, lateral sucker of first pair; L.z, lateral sucker of second pair; ME., median lobe of foot; 

 SAL., salivary gland; T.AC., enlarged terminal sucker; V., position of genital opening (female); W., right wing. 



