462 G. M. R. Levinsen. 



avicularium, is of very variable form and breadth. In most cases 

 it is bicuspidate, but sometimes it is provided with a straight edge, and 

 in rare cases is very narrow and acuminate. The zooecia, which do 

 not seem to possess any pores, not even marginal ones, are provided 

 with greatly projecting marginal ridges from which rises a number 

 of transverse ribs, some of which are very high; in old zooecia, 

 therefore, the frontal surface is as a rule divided into a number of 

 very deep spaces. While some of the ooecia have no pores at all, 

 the large plurality of them are provided with 1 — 7 pores, and in a 

 number of them a larger or smaller marginal portion is hidden by an 

 ooecial cover, rising from the surrounding zooecia. 



A number of small colonies are found on hydroids. 



St. 68 a, Øresund, 40-60 m. 



Discopora Sarsii Smitt. 

 Escharoides Sarsii Smitt, op. cit. 1867, Bihang, pp. 24 and 158, Tab. 

 XXVI, figs. 147—154. 



— — Hincks, Ann. Nat. Hist. 6. ser. Vol. 1, p. 218, PL 



XIV, fig. 1. 



— — Waters, op. cit. p. 85, PI. 11, figs. 21—23. 

 Posterula — Jullien & Calvet, Bryoz l'Hirondelle, p. 89, 



PI. XI, fig. 4. 

 Escharopsis lobata Norman, Ann. Nat. Hist., ser. 7, Vol. XII, p. 123. 



In this species the ectoooecium is provided with 1 — 4 pores of 

 various form and size, but it is gradually concealed by an ooecial 

 cover consisting of three different portions, one of which takes its 

 origin from the distal zooecium while the two others, which are con- 

 tinuous with the peristome, arise from the proximal one. The tooth 

 which is sometimes repeated once or twice is as a rule conical, with 

 an obtusely pointed end, rarely somewhat compressed with a straight 

 edge. The distal wall is provided with a rib-like thickening within 

 its basal edge. 



Some fragments are taken. 



St. 66, Stormbugt, 30— 40 m. 



St. 95, The Sound between Renskæret and Maatten, 50 — 100 m. 



Discopora pavonella (Alder). 

 Discopora pavonella Smitt, op. cit. 1867, Bihang, pp. 28 and 178, Tab. 



XXVII, fig. 181. 

 Mucronella — Hincks, Br. Mar. Pol. p. 376, PI. XXXIX, figs. 



8—10. 



— — Osburn, op. cit. p. 243, PI. XXVI, fig. 60. 



Numerous colonies on hydroids and on balanus sp. 



