PLATE XV 



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

 float-length 2-9 cm., gas-gland diameter 7 mm., seen from leeward 

 (under) side to show early growth stages of lee-branches (on black 

 background) at base of cormidium III (five groups to the left, two 

 to the right). All three parts of a young group can be seen in the 

 left-hand branch (oral end) of group 1 at base of cormidium III 

 (on right-hand black background), tentacle, gastrozooid and gono- 

 dendron (reading from right to left), x 4. 



Fig. 2. Specimen Juv. B. Cormidia V and VI before separation (oral 

 end to the right) seen from to windward. Cormidium VI is seen 

 partly from the aboral end. The figure shows the conspicuous, 

 precocious gastrozooid of group 1 of V and of VI (right), and the 

 peculiar gonodendron ; the lateral groups of VI (bottom centre) ; 

 on the left, the gastrozooid and gonodendron of group 1 of VI 

 (above), and lateral groups (below), x 5-3. 



Fig. 3. A left-handed specimen from Lanzarote, no. 25. Cormidium III 

 seen from above (inside float) to show lee-branches (top right). The 

 main series of lateral groups is at the bottom, group 1 to the 

 right, x i-6. 



Fig. 4. A left-handed specimen from Lanzarote, no. 2, float-length 

 10 cm., Cormidium I to show individual groups (sixteen). The 

 gastrozooid is on the aboral side of each group ; the gonodendron 

 is hidden underneath (except that of group 2). The bases of the 

 peduncles were cut in dissection, x 1-5. 



Fig. 5. A right-handed specimen, B.M. Register no. 26.3.6.1, float- 

 length 18-5 cm., taken by R.R.S. 'Discovery' on 21 October, 1925, 

 in 27 15' N., 1 5 32' W. Cormidium I viewed from aboro-wind- 

 ward side to show the projection formed by the younger lateral 

 groups of I (to which all these tentacles belong). For an earlier 

 stage of development of this area, see PI. XIV, fig. 3. x 1-4. 



Fig. 6. A left-handed specimen form Lanzarote, no. 16, float-length 

 12 cm. Cormidium I to show curled-up terminal, lateral groups, 

 fourteen in number, x 5. 



