j, PORII-KRA. II. 



I suppose that the species must be regarded as a native of the cold bottom; station 2, to be sure, 

 shows a temperature of 5°3 C, but this station is situated on the Iceland-Faroe ridge, and here, I think, 

 the circumstances may be changing. 



Note. Tops en t, in 1904 (Resultats des Campagn. sc. du Prince de Monaco, Fasc. XX Y, 174, 

 PL III, fig. 5, PI. XIV, fig. 17, PL XVIII, fig. 2), has established a genus, Stelodoryx with the species 

 procera ; this species has an exterior and a skeletal structure quite similar to that of pedunculata. its 

 microsclera are aucora; with five teeth at either end. Topsent says that it is related to Lissoden- 

 doryx bv its smooth skeletal spicules, but deviates by its skeletal structure, which latter fact is his 

 principal character for the establishing of the genus. On this character, however, the genus surely 

 cannot be maintained, and as the species has ancorse, it belongs to Myxilla. It seems, by its five- 

 toothed ancorse, to be closely allied to the following two species, diver siancorata and pluridentata, of 

 which diver siancorata seems to be closely allied to it also by its form and skeletal structure. 



7. M. diversiancorata 11. sp. 



PL V, Fig. 3. PL XV, Fig. 2 a— i. 



(Erect, stalked?). The surface slightly shaggy. Tin- dermal membrane thin, supported by bundles 

 of dermal sp/c?/les. The skeleton an irregular reticulation of polyspicular longitudinal fibres connected 

 by scattered spicules and spicu/a-buudles. Spicula : Mcgasclera: the skeletal spicules smooth styli <rj6' 



0-62""". the dermal spicules tornota o-j2f— 0-458"""; microsclera two forms of pluridentate ancorce spa- 



tulifene. large ones with five, sometimes six to seven teeth o-oyi — croog""". small ones with seven to eight 

 teeth 0-035?— 0-048""". 



Of this species we have only a very scanty material, viz. two specimens, both more or less 

 damaged. The largest specimen has a somewhat irregular ovate form, and looks as having belonged 

 to an erect sponge. It is broken below, and perhaps it has had a stalk. It has a height of i7 mm and 

 a o-reatest breadth of n mm . The other specimen is a very small one, attached to the shell of a 

 Brachiopod, and it is assuredly only a fragment. The colour (in spirit) is light brown. The consistency 

 is rather soft and somewhat elastic. The surface, where it is undamaged, seems to be slightly shaggy. 

 The dermal membrane is a thin film, which, as far as I have been able to see, is supported by more 

 or less projecting bundles of dermal spicules. It is filled with microscleres to an exceedingly high 

 degree. Pores and oscula were not seen. 



The skeleton. The dermal skeleton, as before mentioned, seems to consist of spicula-bundles 

 issuing from the skeleton and supporting the dermal membrane. The main skeleton consists of a 

 rather irregular reticulation of polyspicular, but rather loose fibres. Longitudinal fibres occur, especially 

 running up through the sponge and sending branches to the surface or bending out to the surface, 

 but their course does not seem to be regular, as it is, for instance, in the preceding species. Transverse- 

 fibres are not formed, but bundles of spicules or single spicules are irregularly scattered between the 

 longitudinal fibres. Spongin is found in the fibres, but being little copious and exceedingly white and 

 clear it is only to be observed with difficulty; it is most distinctly seen in the nodes. 



Spicula: a. Mcgasclera. 1. The skeletal spicules are smooth styli, somewhat curved, almost 



