PLATE 4 
EXPLANATION OF FIGURES 
Nectonemertes mirabilis 
10 Transverse section through middle of body, showing proboscis (p) in its 
sheath (ps) and the extensive development of the intestinal diverticula (7d); 
em, circular muscular layer; /m, longitudinal muscular layer; In, lateral nerve; 
lv, lateral blood-vessel; rc, rhynchocoel. X 116. 
11 Transverse section of proboscis, showing the twenty proboscidial nerves 
(pn); emp, outer circular muscles; cmp’, inner circular muscles; ep, outer epithe- 
lium; ep’, inner epithelium; /mp, longitudinal muscles. 96. 
12 Portion of longitudinal section of tentacle, showing its musculature; cm’, 
circular muscular layer; dum, dorsoventral muscles; 7/m’, inner longitudinal, and 
Im’, outer longitudinal muscular layers; bm, basement layer. > 180. 
13. Transverse section of tentacle; lettering as in figure 12. X 180. 
