448 G. M. R. Levinsen. 



Discopora scutulata Smitt, op. cil. 1867, Bihang, pp. 25 and 165, Tab. 



XXVII, figs. 160—161. 

 Cibrilina — Nordgaard, System. Fortegn., Cheilostomata (Ber- 

 gens Museums Aarbog, 1894—95) No. 11, p. 20. 

 Harmeria — Norman, East Finmark, Polyzoa, Annals Nat. Hist., 

 7 S., Vol. XII, 1903, p. 107—108. 

 (PI. XIX, figs. 15, 16, 17). 



As the species seems to be subject to great variation in different 

 localities and, besides, needs a more thorough examination, I shall 

 here give a description of the form taken on the Denmark expedition. 



I have seen a large number of young colonies in different stages 

 of growth, but only in four of them is the ancestrula perfectly sur- 

 rounded by zooecia, and in a similar number only a small proximal 

 portion of its circumference is still free. The named colonies have 

 a largest diameter of с 3— 3,5 mm. 



The ovate ancestrula is membraniporidan, and the membranous 

 frontal area, in the distal portion of which is seen an opercular 

 valve, takes up the whole frontal area, being only surrounded by a 

 low calcareous frame without spines. In the closed colonies the an- 

 cestrula is in connection with five larger and three smaller zooecia, 

 the latter of which join the proximal end, and in the above men- 

 tioned, not wholly closed colonies the five larger zooecia are also 

 present, while one or more of the smaller proximal ones are absent. 

 The five larger zooecia are still in connection with 3 — 8 others of 

 the same kind, and therefore the whole number of the larger zooecia 

 found in the above 8 colonies are 8—10, but before the three proximal 

 zooecia have been developed, the larger zooecia are surrounded by 

 numerous smaller ones. 



The very convex zooecia possess a completely calcified basal 

 wall, which distally to the basal margin of the distal wall presents 

 an angularly bent mark. It is undoubtedly due to the difference 

 in thickness between the proximal (elder) and the distal (younger) 

 zooecium, and therefore it is most distinct in the younger portion 

 of the colonies. The lateral walls, which are independent, are in 

 their distal half provided with a rosette-plate with 3 — 6 pores, and 

 the curved or feebly angular distall wall, which is more or less 

 ascending frontally, presents on each side a similar rosette-plate. In 

 a single case I have seen a single median many-pored rosette-plate. 



The aperture is provided with a concave proximal margin and 

 at each side is seen an indistinct projection which indicates the 

 boundary between the valvular and the accessorial portion of the 

 feebly chitinized compound operculum. The aperture of the larger 

 zooecia is as high as broad, semielliptical-quadrangular and provided 



