26 0. NORDGAARD. [2nd arc. EXP. FRAM 



This form, which is near P. proboscidea, ought by rights to be 

 separated as a species of its own. The colonies of umbonata formed 

 incrustations upon stones; they are easily distinguished from the first 

 named species by the fact that the frontal wall of the zooecia (fig. 40) 

 has only a few marginal pores, whereas in proboscidea it is abundantly 

 perforated. But small hollows are found on the frontal wall. On the 

 lateral walls, there was a similar arrangement of roselte-plates to that 

 in proboscidea^. The basal walls of the zocecia were thin and smooth. 

 The ocecia (fig. 40) were almost globular, and were furnished anteriorly 

 with small hollows without perforation. The operculum (fig. 42) had a 

 distinct thickening of the margin. The avicularium is situated on the 

 upper side of the rostrum, and the mandible (fig. 41) is semicircular. 



Gen. Escharopsis, VerrilP. 



47. Eschciropsis sarsi, Smitt. 

 Syn. BiDENKAP Kat., p. 23 (Eschar oides). 



July 22, 1900, the winter haven, about 30 fath.; Aug. 4, 1900, 

 Sjopolse Ness, 12 — 25 fath., on Balanus and old Gellepora branches; 

 Aug. 8, 1900, the winter haven. 



The branches of the colonies were throughout narrower than, for 

 instance, in specimens from Tromso Sound in the north of Norway. 

 There were a large number of specimens from the winter haven (July 

 12, 1900). 



Gen. Monoporella, Hincks'^. 



48. Monoporella spinalifera, Hincks. 

 Syn. BiDEKKAP Kat., p. 29 (Mucronella). 



To this may be added the following: 



1889. Muconella spinulifera, Hikcks, Ann. Mag. Nat. Hist., ser. 6, vol. 3, p. 431, 



PI. 21, (ig. 3. 

 1903. Monoporella spinulifera, Nobman, Ann. Mag. Nut. Hist., ser. 7, vol. 12, p. 11.5. 



July, 1900, the neighbourhood of the winter haven, incrusting stones; 

 Aug., 1900, the north side of N. Devon; July 18, 1901, the winter 

 haven, about 30 fath.; July 19, 1901, Gaase Fjord, incrusting stones. 



' See Hydr. Biol. Inv. Norw. Fj., PI. 4, fig. 8. 



2 See Norman, Ann. Mag. Nat. Hist., ser. 7, vol. 12, p. 123. 



^ See NoKMAN, Ann. Mag. Nat, Hist., ser. 7, vol. 12, p. 115. 



