442 G. M. R. Levinsen. 



I have pointed out that it really belongs to the family Membraniporidœ 

 and especially to the subgenus Callopora. Smitt, the author of the 

 species, refers it to Lepralia because the aperture in the colonies 

 examined by him has a certain likeness to that of Lepralia Pallasiana 

 being provided with a short proximal enlargement, and this fact 

 distinctly shows how little the form of the aperture is to be relied 

 upon as a systematic character. The form and the size of the aper- 

 ture in this species is really subject to a very great variation, and 

 while in some colonies, f. inst. in those examined by Smitt, the 

 length of the aperture is contained thrice in that of the whole zooecium, 

 in others (pi. XIX, fig. 9) it is half as long as the latter and has an 

 ovate-pyriform shape. It is evident that we have here to do with 

 a membranous frontal area, provided with an opercular valve. We 

 may further point out two other characters which distinguish the 

 members of the division Anaska, namely that the avicularia lack a 

 cross-bar, and that the frontal calcareous surface has no pores. 



None designates the zooecia as punctate, but in all the colonies 

 examined by me the whole surface of the zooecia and of the ooecia 

 is provided with an elevated reticulate meshwork. The distal portion 

 of the aperture is surrounded by 4—6 spines, the two distal ones 

 being separated by a large interspace; the two proximal ones are 

 often absent. In most colonies examined by me the spines are re- 

 presented by a cylindrical open joint, but sometimes there are two 

 or three, and in some colonies the base joint of the second pair has 

 a more or less broad, flattened form, reminding one of the singular 

 spatulate spine seated proximally to the aperture. In a single colony 

 the two distal pairs of spines are very long, bifurcate. 



The median avicularium, which has been seen already by Smitt 

 but not recognised by Waters and Norman, corresponds to that found 

 in the same place in other species of the subgenus Callopora, and 

 the lateral avicularia correspond to those which I have found in M. 

 craticala. For the rest they are all very inconstant. When the 

 median avicularium is found together with an ooecium it is partially 

 or wholly placed on the top of the latter but I have seen a whole 

 colony with тап}»^ ooecia and not a few avicularia in which not a 

 single avicularium is in connection with an ooecium. The ecto- 

 ooecium is undoubtedly membranous. The distal half of each 

 zooecium is provided with 6 large, few-pored pore-chambers, two 

 distal ones and two on each side. 



8 'small colonies, 6 of which are found on stones. 



St. 63, Stormbugt, 20—40 m. 



St. 71 a, off Cape Bismarck, 30—40 m. 



