I: 6 PORIFERA. II. 



respectively East-Greenland and Kergnelen, some suspicions might be aroused with regard to the 

 certainty of the identification. I have had, however, a fragment of the type specimen for examination, 

 and I regard the identification as quite sure. First also the type specimen shows that a slight crenu- 

 lation of the upper end of the skeletal styli is most frequently found. Next the type specimen, besides 

 the spined bows, has also smooth ones, as mentioned in my description. Ridley and Dendy do not 

 mention any smooth bows; but when giving the size of the bows they say: size of full-grown spicules, 

 accordingly they must have seen some bodies which they have taken to be younger forms, and these 

 bodies have, no doubt, been the smooth bows. A little difference is found between the type specimen 

 and my specimen, but it is only a slight difference of size in the spicules, which is of no importance and 

 would, no doubt, be effaced, if a richer material was at hand. Thus the styli of the type specimen 

 do not exceed 0'536 mm , and this is about the lower limit for the styli of my specimen; and the toxa 

 attain only a length of o i 3 mm , while in my specimen they may be o-4 mm long; also the dermal styli 

 are upon the whole a little smaller, whereas the chelae are of equal size. 



Locality: East-Greenland, the depth not stated (The East-Greenland Expedition 1891—92). Two 

 fragments. 



Geogr. distr. The species was before only known from Kerguelen, depth 20—60 fathoms (Chal- 

 lenger). The distribution of the species is accordingly very peculiar, as it seems to be bipolar; it is, 

 however, to be remembered that we have hitherto so slight a material of this species, only two speci- 

 mens having been obtained by the Challenger Expedition. 



The genus Artemisina was established in 1885 by Vosmaer with the species subcritoidcs, 

 which has now proved to be identical with the Suberites arciger established by O. Schmidt in 1870. 

 When the quite heterogenous genus Aviphilcctus is dissolved, the species apollinis established under 

 this genus by Ridley and Dendy in 1887 must be referred to the genus Artemisina, as has been 

 done by Tops en t. Then in 1892 Topsent has established a third species, A. transiens, and in 1904 

 a fourth species, A. erccta. A fifth Artemisina-species seems to be found in the Desmacidon rimosa 

 established by Ridley (Zool. Collec. of the Alert?, 609, PI. LIU, fig. F., PI. LIV, fig. mm); it is provided 

 with larger and smaller styli, the latter often with spined head-end, and it has of microsclera small 

 isochela; palmatse and smooth bows. Thus at present these five species make up the genus. By the 

 establishing of the genus some stress was laid upon the suberites-like consistency; this character, how- 

 ever, is not found in the species apolliiiis and erecta, whose consistency is different from that of the 

 other species. With regard to the spiculatiou the species agree in having small palmate isochelse and 

 toxa. In the megascleres, 011 the other hand, some difference is found; thus arcigera has subtylostyli, 

 of which those piercing the dermal membrane are of a special form, apolliiiis, erccta, and rimosa have 

 styli and as dermal spicules a special form of styli with slightly spined head-end 1 ), transiens finally 

 has only one form of styli, all with spined head-ends. Of bows arcigera and erecta have spined bows, 



1) The description of the distribution of the two forms of styli in rimosa is somewhat obscure, but it is at all event 

 stated that the small ones occur in the dermis. 



