ATLANT. DEEP-SEA EXPED. 1910, Vol. IV.] 



SPONGIA. 



17 



Asbestopluma pennatula O. Schmidt. 



PI. Ill, fig. 3. 



Vide litter: 40, p. 28, 17 p. 44. 



St. 102. One specimen. 



This species is represented only by the upper part 

 (9.3 cm. long) of the sponge, which consists of two dicho- 

 tomous and anastomosing main branches. The breadth 

 of the stem at the lower somewhat twisted end — probably 

 the beginning of the stalk — is 0.1 cm. The branchlets 

 are nearly invisible and commence from the lowest third 

 of the stem. The specimen is mostly denuded. 



Skeleton. The axis, consisting of closely connected 

 parallel styli and single subtylostyli with their points 

 turned upwards, has rather large canals. It is surrounded 

 by a dense layer of styli arranged parallel to the longi- 

 tudinal axis. The skeleton of the branchlets oppositely 

 inserted in the narrow side of the stem consists of an 

 axis of subtylostyli arranged in a fanlike manner in the 

 longitudinal direction of the stem. Patches of the coating 

 have been found consisting of densely interwoven finely 

 spinulous tylostrongyla. 



Spiculation: Megasclera are styli, 0.850 — 1.15 

 mm. long and 0.023 mm. thick; subtylostyli, about 0.500 



mm. long and 0.018 mm. thick, and tylostrongyla, irregu- 

 larly curved and spinulous, varying between 0.040 — 0.170 

 mm. in length and reaching up to 0.003 mm. in thicknes. 

 Microsclera are large anlsochelae 0.070 mm. long, 

 small anlsochelae 0.014 mm. long and slgmata 0.018 — 

 0.037 mm. long. 



These spicula may be identified in all details with 

 the figures of Lundbeck (pi. X fig. 4 a — o, 5 — 7. op. cit.). 



Remark. As to the synonymi of this species I follow 

 Lundbeck. After the reexamination of my species Esperella 

 plumosa erected in 1903 (2)1 agree with him in regarding 

 it as a synonym of Asbestopluma pennatula O. Schmidt. 

 I myself then thought at first it was Clardohiza norden- 

 skjoldii Fristedt; but as Fristedt did not mention the 

 small chelae I could not be certain. But now since Lund- 

 beck states they are present, there is no doubt any 

 longer. 1 have also had Armauer Hansen's Esperla 

 blhamatifera for comparison and find it to be identical 

 with this one. 



Geographical distribution: This species has 

 been recorded only from northern areas as is seen from 

 the following list: 



Locality 



Depth 



Name of expedition 



Literature 



Off Bukkenfjord & Haugesund | 





O. Schmidt: Jahresber. der Commiss. zur 

 Wiss. Unters. deutsch. Meere in Kiel — 

 flir 1872-73, 1875 p. 119. 



Trondhjems Fjord 





Arnesen: Spongien von der Norw. Kiiste, 

 Bergens Mus. Aarbog 1903, No. 1, p. 11. 



Lundbeck: The Danish Ingolf. Exp. vol. 

 VI, Part 2, 1905, p. 51. 



Barent Sea 



"Willem Barents" 



Vosmaer: Niederl. Arch, fur Zool. Suppl. 









Bd. I, 1882, p. 47. 



Loc? 





The Norw. North- 

 Atlantic-Exp. 

 "Vega"-Exp. 



Arm. Hansen: Spongiadas. Norw. North 



East coast of Greenland 



Atl. Exp. Bd. Ill, p. 15. 

 Fristedt: Vega-Exp. Vet. Iakt. IV, 1887, 



• 

 Gulf of St. Lawrence 





p. 455. 

 Lam be: Proc. Roy. Soc. Canada, Ser. 2 II, 

 Sect. IV, 1896, p. 189. 



Between Faeroe-Island.in J Iceland & South 







Lundbeck: Desmacidonidae (Pars), The 



of Iceland and Danmark strait 



N. of W. Thomson Ridge 60° 57' N, 40° 

 38' W. 



1098 m. 



Ingolf-Exp. 

 "Michael Sars" 1910 



Danish Ingolf. Exped., vol. VI, Part. 2. 

 1905, p. 51. 



Stylotella columella (Bowerbank) Topsent. 



(PI. Ill fig. 2). 



Vide litter: 4, vol. Ill p. 243, 34 a, p. 536. 



St. 37. Two specimens. 



Both specimens are erect with lobate or flat anasto- 

 mosing branches; the one is 30 cm., the other 10 cm. 



ARNESEN — 3 



high, both with a base about 2.5 cm. in diameter. The 

 surface is smooth, uneven, with a thin pellucid dermal 

 membrane. Distinct, round or oval pore-areas are to be 

 seen all over the surface (like those mentioned in Myxllla 

 panpertas var.). Colour in spirit light brownish. The 

 plurispiculous fibres of the rate consist of tomostrongyla 



