5913 



I. IKEDA : 



List of Abbreviations. 



an., anuH. 



aut.div., anterior cliverticiiluiii. 



a.v., aiferent vessel. 



hi., l)lasto})ore. 



blx., blastoccelic pore. 



cir.c, ring vessel, /.e., the collar cavity. 



col., collar of larva. 



col.c, collar cavity. 



Corp., blood corpnscles and corpuscle 



mass. 

 dig. a., digestive area. 

 diu., stomach diverticulum. 

 d.v., dorsal vessel. 

 cet., ectoljlast. 

 cxc.c, excretory cells. 

 /. and /'. nephridial funnels. 

 f.n., female pronucleus. 

 gL, nerve ganglion. 

 ghl., gland. 

 int., intestine. 

 n/,., mouth. 



mes., postoral septum. 

 mcs\, preoral septum. 

 Mes., mesoblast cells. 

 m.gl., mucous gland. 

 m.f., mesenchymatous libres. 

 m.n., male })ronucleus. 

 m.sh., muscular sheath of the stomach. 

 nep.c, nephridial canal. 

 ncph., nephridium. 

 ncp.o., nephridial pore. 



ncjj.p., nephridial pit. 



n./., nerve fibre. 



â-s'., œso})hagus. 



o.po., [)ouch pore, 



p.(>., [»olar globule. 



p.c.c, larval collar cavity. 



per., peritoneal epithelium. 



p)er.hel., perianal belt. 



pi. CO., ])lasmic cor})Uscle. 



pjo., ventral pouch. 



jjre.hel., preoral belt. 



pre.c, i)reoral body-cavity. 



pre.l., preoral lobe. 



p.r., posterior recess of preoral cavity. 



p.t., larval tentacle. 



ret., retractor muscle in the culhir. 



reV ., retractor muscle in the trunk. 



s.i-.e., adult collar cavity. 



S.O., sense organ. 



■s'.6'., sinus space. 



s.t., iulult tentacle. 



üiii., stomach. 



t'., i"., t'"., hr.vt, second, third 



larval tentacles. 

 tr., trunk. 

 tr.c, trunk cavity. 

 t.v., tentacular vessel. 

 V.C., vascular cœca or capillaries. 

 v.gr,, ventral groove. 

 v.DbCs. ventral mesentery. 

 ■v.u., ventral vessel. 



