264 



segments and the margin ol" the colony is lormed by a row of kenozocecia. In 

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

 inner wall and finally fills the whole of the kenozod'cinm with a strongly tuhcr- 

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

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

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



Colonies from South Africa. 



'Carbaseci'i Mose I eiji Busk \ which undoubtedly belongs to this family but seems 

 to have no ascopore, is by Ortman'- referred to a new' genus Onchoiioroides; 

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

 in most zoa-cia in Busk's drawing, unquestionably originate from the basal 

 walls of the beginning ooccia. 



Family Euthyroidae n. 1. 



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

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

 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 aviciilaria may occur. The ectoooecium of the hyper- 

 stomial oa'ciiiin is provided with a pair of large fenestrse. Colonies free, branched, 

 Fluslra-like. 



A single genus: Euthyroides Harmer^ 



Euthyroides Jellyae n. sp. 



(PI. XVI, ligs. ,Sa-8e). 



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

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

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

 porous rosette-plates. The aperture, which in the non-oa>cia-bcaring zoo'cia 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. Immedialelj' on the 

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



8, p. r>(). - 87, p. 12. ' 111, p. -.'SO. 



