NEMERTINEA I'.AYLIS. 



is somewhat larger th.-ni I lit- tvpe specimens, the body measuring H mm. in length, and 

 :! nun. from side tu side at the widest part, which is about tin- middle. The animal 

 tapers towards the head and tail. The dorsal Mirlace is convex, the ventral snrt'aee 

 concave. The proboscis was extruded to a distance of ."> nun., but is now broken oil. 

 and a microscopic preparation has Keen made i>t it 

 to show the annatnre. 



Several of the specimens are very minute, 

 measuring milv about '2 mm. in Length. 



The coloration (in spirit) is as follows: the 

 dorsal side is of a yellowish flesh-colour, with a 

 distinct reddish-brown pigmented median stripe ; 

 the ventral side is of a pah 1 ochreons yellow. 



The four lar<'v eves have lieen made out 



O 



I iv clearing iu creosote. The two <m either side 

 lie close together, one liehind the other. (Text- 

 fig. 1.) 



, ANATOMY. 



FIG. 1. Pi-iixtiiiiui unilineatum : dorsal view 

 of the anterior end, magnified, showing 



the eyes (K.) 



The anatomy has not been fully worked out, 



as serial sections have not been cut, A few transverse sections taken by hand reveal the 

 following characters : 



niHli/-tmll. The external epithelium (PI. I, fig. 8, Ep.) consists of very tall cells, 

 interspersed with many unicellular glands and their secretions, which are seen escaping 

 to the exterior. It rests on a thin basement-membrane, which separates it from the 

 circular muscle-layer. 15oth this latter layer and the succeeding longitudinal layer are 

 thin and but feebly developed. 



(h-n. The largest specimen is a female, and the entire space within the 

 longitudinal body-muscles, where uot occupied by the gut and its lateral diverticula. or 

 by the proboscis-sheath, is filled with eggs of relatively enormous size (PI. I, fig. H, (>v.). 

 measuring about 0-4 mm. in diameter. Their nuclei are also large (0 ' 08 mm. ' 1 mm. 

 in diameter) and contain many refringent globules. 



Proboscis-sheath <ni<l Prnl><'ix. The proboscis-sheath 

 is proportionally large, and is supplied with strong circular 

 muscles. 



The proboscis is relatively verv stout, but its armature 

 is minute, in accordance with the small si/e of the whole 

 animal. The form of the central stvlet and its basis is repre- 

 sented in text-fig. 2. The basis measures O'l.") mm. in 

 length. There are two pockets containing reserve stylets to 

 the number of about four in each. 



IMC. -i.ProxtonHi ii 



tum: the functional 

 stvlct of the pnil ii isris, 



and its basis, 



uia<'iiitic'il. 



