NEMERTEA ENOPLA 



629 



rliynjch-CCLv. 



Text-fig. 1. 



bobS rn 

 oini. \ ^rit 



^atn 



o.cnv. ocis.rn. 



rnyncn 

 cat'. 



o.c.rn 



t./.m i c rn c i.in 



a. b. c. 



Schemata of the musculature, nervous system, and body-wall in : 

 a, Palaeonemertini ; 6, Heteronemertini ; c, Enopla. In trans- 

 verse section. 



List of Abbreviations. 



acc.sf., accessory stylet; an.bl.v., unpaired anal blood-vessel; an. L, 

 anal commissure of blood- vascular system ; atr., atrium ; has., 

 base of stylet; bas.ni., basement membrane; b.g., entodermal 

 blind-gut ; bl.v., blood-vessel ; bod.par., body parenchyma ; 

 br., brain ; cer.bl.c, cerebral blood commissure ; cer.can., cerebral 

 canal ; cer.sac, sac of cerebral organ ; circ.m.f., circular muscle- 

 fibres ; cm., new circular musculature of proboscis ; d.b.v., 

 dorsal blood-vessel ; d.g., dorsal ganglion ; dig., digestive tract ; 

 d.n.comm., dorsal nerve commissure ; ej.d., ejaculatory duct ; 

 gangl., ganglionic part of cerebral organ ; gastr., gastric cavity ; 

 gl., glands; g.p., gonopore; g.s., gonadial sac; i.c.m., inner 

 circular muscle-coat ; i.l.m., inner longitudinal muscle-coat ; 

 int., integument ; int.p., intestinal pouch ; lat.n., lateral nerve- 

 cord ; l.b.v., lateral blood-vessel ; l.m.f., longitudinal muscle- 

 fibre ; m., mouth ; m.bl.c, metamerical blood-vessel commis- 

 sure ; musc.sept., muscular septum ; nephr., nephridium ; 

 o.c.ni., outer circular musculature; oes., oesophagus; o.l.m., 

 outer longitudinal musculature ; ov., ovary ; p.e., proboscidian 

 epithelium ; p.end., proboscidian endothelium ; p.p., proboscis 

 pore ; prob., proboscis ; prob.cav., proboscidian cavity ; prob.n., 

 proboscidian nerve ; prob.w., proboscidian wall ; pyl., pylorus ; 

 rad.m., dorsoventral musculature ; rh.c.m., normal circular coat 

 of rhynchocoelomic wall ; rh.l.m., normal longitudinal coat of 

 rhynchocoelomic wall ; rhynch., rhynchodaeum ; rhynch.bl.v., 

 rhynchocoelomic vessel ; rhynch.cav., rhynchocoelomic cavity ; 

 rhynch.div., rhynchocoelomic diverticula ; rhynch.end., rhyncho- 

 coelomic endothelium ; rhynch.m., rhynchocoelomic musculature ; 

 rhynch.w., rhjmchocoelomic wall ; sac, sac with accessory stylets ; 

 St., stylet ; t., testis ; v.g., ventral ganglion ; v.g.s., V-shaped 

 gonadial sac ; v.n.comm., ventral nerve commissure of the brain. 



