PLATE XIV 



Fig. i. Cormidium IV of a young left-handed specimen from Lan- 

 zarote, no. Juv. 1 1 , to show stages in the growth of the tripartite 

 groups. Group i (bottom) has a gastrozooid and gonodendron, 

 but no tentacle. Group 2 (right and centre) is tripartite, but the 

 gastrozooid has been lost. Group 3 (top, left and right) is tri- 

 partite. Group 4 (left and across to top right) is tripartite, x 8. 

 For drawing of a comparable cormidium of the oral zone see 

 Text-fig. 15. 



Fig. 2. Part of cormidium I of specimen no. 5 from Lanzarote to show 

 an early growth stage of a tripartite group (black background 

 below) gastrozooid, tentacle and ampulla, and gonodendron. x 6-5. 



Fig. 3. A young left-handed specimen from Lanzarote, no. Juv. 12 

 (cf. PI. VIII, fig. 1), float-length 2-9 cm., gas-gland diameter 7 mm., 

 seen from the upper or windward side to show eight individual 

 groups of cormidium I, on the left; main tentacle (cormidium II) 

 on the right, with lateral groups on its left ; tentacle (ampulla) and 

 gastrozooid of groups 1 of cormidium I (gonodendron underneath) 

 in centre ; tentacle (gonodendron lying over it, gastrozooid missing) 

 of group 2 of cormidium I ; groups 4-8 of cormidium I at top left. 

 There are no nematocyst heads yet developed on the tentacles of 

 groups 5-8 (see PI. XV, fig. 5 for more mature state of the pro- 

 jection carrying the terminal laterals of cormidium I), x 5-5. 



Fig. 4. A right-handed specimen from Lanzarote, no. 5, float-length 

 11-5 cm. Cormidium I viewed from windward and slightly above 

 to show : main series of groups (eleven), oldest on the left, youngest 

 curling back almost to meet it ; lee-branches at top left and right ; 

 aboral branch just under a horizontal tentacle of lee-branch at 

 right indicated by a white pointer; scar of gastrozooid of main 

 group at right base of its peduncle ; gonodendron of main tentacle 

 to left of its peduncle. Tentacles of groups 6, 7, 8, and 9 lie on the 

 top of those of 2 and 3. x 2-3. 



