PLATE XVII 



Fig. i. Part of cormidium II of specimen Lanzarote no. 2. Separated 

 branchlet 6 of the lee-branch figured in fig. 2. x 2-6. 



Fig. 2. One of the basal lee-branches (see Text-fig. 17 A) cut from 

 cormidium II, consisting of six branchlets representing the remains 

 of tripartite groups 1-5, or subsidiary basal branches, 5 a and 6. 

 Branchlet 1 has lost its gastrozooid ; branchlets 2-5 are gonodendra 

 only; 5 a and 6 consist of five and six groups respectively (for 

 branchlet 6, see fig. 1). x 1-3 



Fig. 3. Cormidium III of specimen, Lanzarote, no. 2, seen from the 

 aboral end after cutting off the terminal lateral groups 5-1 1 which 

 are pinned out to the right (top). Shown are: lee-branches, top 

 left; tentacle and gonodendron of group 1 (largest); tentacle and 

 gonodendron of group 2, between 7\ and GON^, gastrozooid 4 , 

 tentacle 4 and gonodendron 4 between 7\ and several laterals ; T 3 and 

 GO N 3 between lee-branch and GON x ; bristle marks the spot from 

 which lateral groups were cut. x 1-8. 



Fig. 4. The same cormidium showing terminal laterals 5-11, group 5 

 on the left (group 1 1 is very small) and a subsidiary basal branch 

 of two groups from the base of group 6 at the top. The divisions 

 between the groups, except 9 and 10, are marked, x 5-4. 



