PORIFERA. I. 



85 



numbers, b. Microsciera. Only one form, sigmata, is found. These are rather thin and almost always 

 contort, up to a quarter of a turn. Their length is between 0-017 — 0-028'"™, sometimes they may reach 

 Q.Q^rain. thg thickness is o-ooi"""' in the larger ones, the smaller are a little finer. 



As I have had a piece of the original specimen of Fristedt, I have been able to identify the 

 species -with certaintA-. Fristedt gives the length of the tylostyli to 0-5""", but in the original speci- 

 men before me I have measured it to 0-77""". Fristedt does not mention an oscular side and a pore- 

 side, the reason being, I suppose, that the dermal membrane has been wanting on the pore side of 

 his specimen. With regard to the columns supporting the dermal membrane he says: <The dermis is 

 furnished with numerous funnel-like depressions, which by degrees are closed, forming a fibre*. From 

 the above description I suppose it will be possible to understand, what is meant by this peculiar, not 

 quite correct mode of expression. — The Biemma Datiizenbergi established by Top sent 1. c. must, 

 according to the description, be identical with B. rosea. Top sent to whom I have sent a piece, 

 declares also in a letter that he supposes them to be identical. 



Locality: Of this rather interesting species the Ingolf Expedition has brought home a great 

 many larger and smaller fragments, probably, ho-wever, only representing few specimens. Station 9, 

 64" 18' Lat. N., 27- 00' Long. W., depth 295 fathoms; station 10, 64^ 24' Lat. N., 28° 50' Long. W., depth 

 788 fathoms; station 73, 62° 58' LaL N., 23- 28' Long. W., depth 486 fathoms; station 89, 64° 45' Lat. N., 

 27" 20' Long. W., depth 310 fathoms. All these stations are off the souhwestem coast of Iceland. 



Geogr.distr. Fristedt has the species from East-Greenland, depth 125 fathoms; thus as arctic 

 it has hitherto only been foimd in the Denmark Strait with a bathy metrical range from 125 — 788 fathoms, 

 but this species also belongs to those found farther southward, having been taken on the expedition 

 of the Prince of Monaco in 1S88 (Topsent 1. c. B. Dautzenbergi) at the Azores on a depth of ca. 735 

 fathoms. 



2. B. annexa O. Schmidt. 

 PI. IV, Fig. 14, PI. XVII, Fig. 3 a— f. 



1870. Desinacella vagabimda var. annexa O. Schmidt, Spongienf. atlant. Gebiet 53. 



1874. Desuiacclla pninilio Carter, Ann. Mag. Nat. Hist. Ser. 4, Vol. XIV, 250, PL XV, fig. 42 a, b, c. 



1S75. Desinacella vagabimda var. annexa O. Schmidt, Jahresber. d. Comm. zur wissenschaftHchen Unters. 



d. deutschen Meere in Kiel fiir 1872—73, 1875, 117. 

 1880. Desmacodcs vagabiindus var. ajinexa Vosmaer, Notes from the Leyden Mus. II, 108, 15. 

 1887. Desinacella annexa Ridley and Dendy, Challeng. Report, Monaxonida, Vol. XX, 59. 

 1890. Biemma Chevreuxi Topsent, Bull, de la Soc. de France, Vol. XV, 32. 

 1892. Desmacella annexa Topsent, Resultats d. Campagn. scient. du Prince de Monaco, Fasc. II, 84, 



PI. IX, fig. 18. 

 1896. Desmacella annexa Topsent, Campagne de Caudan> dans le Golf de Gascogne. Ann. de I'Uni- 



versite de Lyon, XXVI, 281, PI. 8, figs. 5—6. 



0/ an irregular foi'm., I'ncrusling, or more or less massive. The dermal mernbrane thin, without 

 spicules, resting on the projecting spicules that are spread in a penicillate way, the surface accord- 

 ingly finely shaggy. The skeleton consists of short fibres chiefly running towards the surface, and 



^ 9 ^ i 



