- PORIFKRA. II. 



o - ooi4 mm . All the microsclera occur in great numbers in the tissue coating the branches and the axis 

 of the part carrying branches; especially the small chela is found in enormous numbers. 



Embryos: In most individuals of this species embryos were found. They are oval or round, 

 most frequently a little flattened, of a diameter of 0-5 — ca. i mm . They were frequently seen to be sur- 

 rounded by a quite clear and transparent membrane. They occur in different, sometimes rather great 

 numbers, and are situated in the mentioned axial canals. Most frequently they are placed in a single 

 row in one of the principal canals (PL II, fig. 1), but they may also be found in the side canals, and 

 they may be so densely crowded as to cause larger or smaller swellings (PI. II, fig. 4). With regard 

 to spiculation they show some differences that are rather interesting. They have only sigmata and 

 the small anisochelse. Sigmata seem to be the form of spicules first occurring, and in some specimens 

 only these occur. In some specimens the sigmata, or most of them, were somewhat smaller than 

 those of the developed individuals. While in the larger embryos sigmata and cheke were found in 

 very great numbers, they were scarce in others, and in some of the embryos no spicules seemed to 

 be present at all. 



Remarks to the synonymy. I have been able by examination of one of the specimens of the 

 Barents-Expedition to identify as pennatula the species mentioned by Vosmaer I.e. as Cladorhiza 

 bihamatifera. Vosmaer mentions it as a difficult thing to get a clear understanding of the large 

 chelae and says, — I now believe that they are to be considered as -&/^/7«-auchorates, where all the 

 teeth are fully developed, and not two with one rudimentary . What is meant by this phrase is 

 unintelligible, as the larger end of these chelae is of the same structure as in all common Mycale- 

 chelae. — Of Armauer Hansen's material I have examined a few specimens which proved to be 

 prima tula, but under his bihamatifera several species are mingled together; from the figures it may 

 however with rather great certainty be decided, which of them belong to the present species. Of 

 Fristedt's Cladorhiza Nordenskioldii I have examined a fragment of the type specimen, which proved 

 it to be pennatula; Fristedt must have overlooked the small chelae. Also Lambe I.e. must have 

 overlooked these chelae, as the Cladorhiza Nordenskioldii mentioned by him is certainly identical with 

 pennatula. It is easily understood that he has overlooked them, as he has had onl) - the lower part, 

 where the small chelae only occur much scattered. Finally the E. plumosa established in 1903 by 

 Arnesen I.e. is identical with A. pennatula, which fact I have been able to decide with certainty, as 

 I have examined a fragment of one of the type specimens. In the quite insufficient description no 

 account is rendered of the two forms of cheke; the length of 2"7 mm given for the megascleres must 

 be due to an erroneous measuring; in the specimen examined by me I have found none larger 

 than o'95 mm . 



Locality: Of this species the Ingolf-Expedition has obtained a great number of specimens. 

 Station 6, 63 43' Lat. N., 14 34' Long. W., depth 90 fathoms; station 39, 62 00' Lat. N., 22 38' Long. W., 

 depth 865 fathoms; station 40, 62 00' Lat. N., 21 36' Long. W., depth 845 fathoms; station 67, 6i° 30' 

 Lat. N., 22° 30' Long. W., depth 975 fathoms; station 68, 62 06' Lat. N., 22 30' Long. W., depth 843 fa- 

 thoms; station 78, 6o° 37' Lat. N., 27 52' Long. W., depth 799 fathoms; station 81, 6i° 44' Lat. N., 27 00' 

 Long. W., depth 485 fathoms; station 94, 64° 56' Lat N., 36 19' Long. W., depth 204 fathoms; and station 

 144, 62 49' Lat. N., 7 12' Long. W., depth 276 fathoms. On station 78 the greatest number of specimens 



