2. 



: -1 ?10 PI. I 



.1. 



.on. z Inf asoi i L'.Ostl rterS i .3-l^-v>l /l.vll 



,.li-i . 



.124. 

 il foi ->ui 0, 055-0, Oo5n.m. long and from 0, 027-0, 032mm. t: road. 



-oval, narrowed and evenly rounded at loth M sistron 1., 

 ,ad at the sides. Ri^ht side convex and left concave. On th<* lorrol 



in the posterior third of the lo^> Is ioun Tistome-li 



,in tfhich Is placed tlv? mouth o ^1n^. There is no oeso^h^us. To 

 . , terior and rl^ht margin of the perlstome 1 ^ttich*:} <n un- 



rane,aavln tho lorn of a la^,. /rou, tae anterior end of the 

 to tii openln extends a ro* of lon_, (adoral)ci li^ j U tne anter- 



,or end is a tui t 01 ci lia,servln^ for preaenslon,and at the posterior 

 i taft oi tactile Irlstles.r.ae contract!. . cuole is to the left In the 



i rd of tno Loij.i'he ellipsoidal mart. ronac leas *ith spherical 

 roriaci'" > js i^in ide It is in -t^ie anterior lalf of the i o ., . 







it. iill stripes of Lame 111 branch la* nu )llina and fOstrea 



edulis)i occurs in Europe and Africa. 



S. Ir\ chorpynchus bait. 

 ?1. 5 fi^.125.. 



..y oLlon^-ovaljev --nlj rounded at t-jp Anterior end. The oosterior end 

 ivided with a conical ,^rroypd a* [no rounded orocass. 







odj is cov red -vitn f ine,tniCAl.y set,trist le-llrt.n cilia.ro 

 i i end,i.e. to tn-2 conical process, is attached a tuft of ra- 

 r ion^ tacti i Bristles, me d^toplasm Consists of a ^:r^ tnln and ho- 

 ,eneous i ^ i. : i<j ent is fine-drained and lull of food. 



ut.i o., .iln^ 1 , .laced it th-e posterior end of the Lod> at the 



tse oi t. conical process. . tructaie of mouth and oesophagus has not 

 fullj inv rstl^ated. , J rotaLly to tne external margin of the mouth open- 



