PLATE XVIII 



Fig. i. Lanzarote specimen, no. 2. Cormidium III (less group 1) seen 

 from the oral end to show: GZ, T (main tentacle) and ampulla, 

 and GON of group 2; lee-branch, top right; and the series of 

 lateral groups, bottom left, x i-8. 



Fig. 2. The same cormidium seen from the aboral end to show: lee- 

 branches top left; terminal lateral groups right; middle lateral 

 groups centre ; aboral branch severed, on black background, after 

 lowering from base of laterals, x 3. 



Fig. 3. The same before cutting off branches. Lee-branches are shown 

 at top left, x i-8. 



Fig. 4. The aboral branch from the base of group 5 of cormidium III 

 of the same specimen to show: three groups, the largest, no. 1, 

 on the right, smallest at top left ; subsidiary basal branchlet of two 

 groups from base of 1/2. The first has a light ampulla, the second 

 is small (top right), x 3. 



