CO PORIFERA. I. 



from Talknafjord in Iceland, of a length of up to 37"""', and a thickness of ca. 10'""'; their skeleton is 

 likewise unispicular, and the spicules are of the same form, but a little shorter, not exceeding o-20"'"\ 

 and most frequently a little shorter; they vary a little more in thickness, increasing to o-oi28"""; other- 

 wise thev are of the same form, and are also most frequently slightly curved in the middle. 



Reniera sp. b. 

 PL XII, fig. I. 

 From station 3, 63' 35' Lat. N., 10" 24' Long. W., depth 272 fathoms, we have a very small 

 fragment; it is, however, sufficient to show that it has belonged to a flat sponge; the skeleton is 

 regular, formed by unispicular fibres, and the surface is finely shaggy. In the fragment are further 

 seen a few polyspicular longitudinal fibres. According to this the sponge must have had a structure 

 resembling that of the above described species parenchyma, folhiiii, and ventilabriun. The spicules are 

 characteristic by their size, being of a length of 0-3 — 0-327"'", and a thickness of ca. 0-027™"'; they are 

 regularly and evenly tapering, and slightly curved or straight. 



Reniera sp. c. 

 PL XII, Hg. 2. 



From Hekla Harbour we have some fragments brought home by the East Greenland expedition 

 1891 — 92; the)- have a unispicular skeleton, and may, as to their exterior, remind of R. clavata^ but 

 the spicules are quite different, being very slender and longer tapering; their length is 0-208 — 0-238'""', 

 but the thickness only 0-008'""'. This species might also, with regard to its form and skeletal structure, 

 recall the R. simplex^ established by Armauer Hansen in the Norwegian North-Atlantic Expedition, 

 which cannot, however, be seen from the description; however, there is the difference that the spicules 

 of the .species of Armauer Hansen are somewhat thicker, o'Oio"'"', and their ends are more stubby. 



As I have had before me one of the original specimens of Armauer Hansen, I shall give a 

 short description of the species. It will, however, have to get another name, as Bower bank in 1866 

 etablished a Reniera (Isodictya) si/iiplex\ I accordingly alter the name to Voeriugii. 



12. R. Voeringii Ldbk. 

 PI. XII, Fig. 3. 

 1885. Reniera simplex Armauer Hansen (non Bow.J, The Norwegian North-Atlantic Expedition XIII, 3, 

 Tab. 6, Fig. i. 



Lengthily pyrifor)iL, longs talked. The dermal membrane thin, ivithout spicules; the ends of the 

 fibres projecting, and the surface accordingly finely shaggy. The skeleton an irregular network of primary 

 and secondary fibres. The fibres unispicular. Partic^Uar polyspicular longitudinal fibres issuing from the 

 stalk, arc present. The spicules are slender, rather sharply curved oxea of a length of 0-22 — o-2j8""". 



The sponge, as pictured 1. c, is lengthily pyriform with a rather long stalk; as the upper end 

 has been broken off, it cannot be seen, however, how long the sponge has been, neither can the 

 structure of the upper end be decided. Through the middle of the thick part a cylindric oscular canal 

 runs, which has most likely ended in an osculum on the top. The length of the specimen is ca. 55""", 



