MYZOSTOMIDA liOULENUKl!. 



L39 



The si/e of the small indi\ iduals seems tu vary with that, of tin 1 large individuals, 

 those found in tlio larger rvsts from the "Terra Nova" collection being considerably 

 larger than the s]ieciniens described liv previous oliservefs. They are approximately 

 riivular in shape, but alwavs a little longer than In-oad, as shown 



iy tin' following 



measurements : 



d 



hi structure these specimens agree perfectly with those deserilied l>y v. Stummer- 

 Trannfels, and the largest show no marked advance over the smallest investigated 

 liy previous observers (the "male" individual deserilied by v. (Jratt' had a length of 

 8 mm. only). 



The different individuals show considerable variation in the mode of branching of 

 the intestinal cava ; the hitter may even differ on the two sides of the body, as sliown 

 in Fig. 4. 



The exaet positions of the parapodia also vary somewhat; in all the specimens, 

 however, the third parapodium of each side is situated nearer the centre of the body 

 than the rest. The other organs are exactly as described by v. Stummer-Traunfels. 



