264 



segments and the margin of the colony is formed by a row of kenozocecia. In 

 the latter a deposition of calcareous matter takes place, which starts from the 

 inner wall and finally fills the whole of the kenozooecium with a strongly tuber- 

 culated, lobed, marginal thickening divided as if in transverse belts (figs. 9 e, 9 g). 

 Radical fibres may issue from multiporous rosette-plates on the basal surface of 

 the colony (figs. 9 c, 9 d). 



Colonies from South Africa. 



^Carbasea<!- Moseleyi BuskS which undoubtedly belongs to this family but seems 

 to have no ascopore, is by Ortman" referred to a new genus Onchoporoides; 

 it seems to have no median pore. The horseshoe-shaped marks, which can be seen 

 in most zooecia in Busk's drawing, unquestionably originate from the basal 

 walls of the beginning ooecia. 



Family Euthyroidae n. f. 



The slightly calcified zocecia have no pores and no covering-membrane. On 

 the proximal side of the operculum they are provided with 1 — 3 pairs of flat, 

 hollow spines, which meet in the central line and cover the entrance to the 

 compensation-sac. A compound operculum. Lateral walls with multiporous ro- 

 sette-plates. Independent avicularia may occur. The ectoooecium of the hyper- 

 stomial ocecium is provided with a pair of large fenestrse. Colonies free, branched, 

 Flustra-like. 



A single genus: Euthyroides Harmer^ 



Euthyroides Jellyae n. sp. 



(PI. XVI, figs. 8 a-8 e). 



The zooecia are elongated, rectangular, slightly arched, with a slightly curved 

 distal wall, which has within its basal margin a zigzag belt of (12 — 14) small, 

 uniporous rosette-plates. The distal half of each lateral wall with 2 — 3 multi- 

 porous rosette-plates. The aperture, which in the non-ocecia-bearing zocEcia is 

 provided with two distinct, rounded hinge-teeth, has a quadrangularly rounded 

 form, its anter being composed of three curved lines meeting at right angles, while 

 its poster forms a more strongly curved line which is generally bent in the form 

 of a saddle (fig. 8 d). The operculum is of a corresponding form and provided 

 with a chitinous thickening along its proximal margin. Immediately on the 

 proximal side of the operculum we find between the two hinge-teeth a very small 



' 8, p. 56. ^ 87, p. 12. * 19, p. 280, 



