PLATK XV. 



I'rr,. 1)1. — Longituilinal scctiim nf tin- tip nf tin- f^ci-Diid rii-nis nf tin- spaili.x. ('. L. X 14. 



< ;, jjland. 



X, nerve. 

 I'll., lil'. — Longitudinal :-\Tti<in throu-h a rryjit and it,< ton^iue ol the tliiicl (■in•u^• ot tlie >jiadi_\. ('. L. X B."i. 

 Fiii. (iS. — Longitudinal section of the base of tlie preoc-uUr.- tentaele. ('. ]>. X -0. 



X, nerve trunk. 



N', nerve bundles running along the anterior .side of the nerve trunk. 

 Flo. ()4. — Longitudinal section of the tip of the ]>reiii-nlar lentaele. C. L. X ~0. 



\, artery. 



CG, ciliated groove on anterior side. 



<i. groove on i)Osterior side. 



X, nerve. 



n, l)ranch nerve to the perii>herai portion of the teiitai-le. 



1!, ridge on anterior side of tentacle. 



V, vein. 



X, breaking ]ilaiie. 

 Kk;. («. — Slightly oblique cross section of tlie preoeular tentacle almut (i millimeters from its tip. ('. L. X ■■!•'>. 



C(i, ciliated groove between the upper and lower projecting ridges, R and E'. 



N', nervi'. 



X', nerve biuidles rimiiing along anterior side of nerve. 



K, lia.se of ))rojecting ridge. 



Ix', U|)wardly projecting portion of the next lower ridge. 



•_'L>I) 



