20 



E. ARNESEN. 



[REP. OF THE "MICHAEL SARS" NORTH 



Lundbeck suggests, may pehaps be an lotrochdla, it is 

 at any rate closely allied to the pluridentate species of 

 Myxilla, like M. diversianorata Lundb., M. pluridentata 

 Lundb., Stelodoryx procera Tops. (41, p. 175) and Dend- 

 oryx dentata Tops. (p. 172) — the two last mentioned 

 belonging to Myxilla according to L u n d b e c k (17, p. 1 50). 

 The smoothness of the styli (like those in Stelodoryx 

 procera Tops.), and the larger proportions of the spicula, 

 have made me hesitate in referring the specimens in 

 hand to pectinata, on the other hand the ancorae agree 

 so well with the ancoras peculiar to this form — even if 

 the teeth are fewer in number, and the size is the same as in 

 D. dentata (0.080 mm. instead of 0.060 mm., and 0.030 

 —0.036 instead of 0.020 mm.) — that I think the "Michael 

 Sars" material must represent a variety of M. pectinata. 

 Both are from the same locality, the Azores group, but the 

 "Michael Sars" material comes from deeper water (2615 

 — 2865 m.) than the form from the "Hirondelle" and 

 "Princesse Alice" (845 — 1495), "repandue dans tout l'ar- 

 chipel des Acores". 



Locality. Between Gran Canada and Cape Bojador. 

 (Lat. 34° 59' N. long, 33° l'W.); depth 2615—2865 m. 

 Globigerina ooze. 



Lissodendoryx complicata Arm. Hansen. 



Vide litter: 17, p. 166. 



(PI. II, fig. 1). 



St. 102. 2 specimens. 



For external appearance the specimens in hand agree 

 nearly absolutely with Lundbecks figures, (pi. V, fig. 11 

 op. cit.). Both are bush-shaped, with compressed ana- 

 stomosing branches arising from a narrow base — no stalk, 

 nor attachment has been observed. One specimen is 4 

 cm. high by about 5X5 cm. in the other dimensions; 

 the other is 6 cm. high by about 5X4 cm. 



The spiculation agrees well with the description and 

 figures of Lundbeck (pi. XVI, fig. 4 a— g op. cit.). 

 Though noticed, the large sigmata were found very 

 sparsely in the internal parts and none in the dermal 

 membrane, where only arcuate chelae and small sigmata 

 were abundant. 



Geographical distribution. Leaving out of 

 consideration the undoubtedly erraneous temperature (-|- 

 6°. 5 C.) given by Armauer Hansen (10). Lissodendoryx 

 complicata Arm. Hansen is an inhabitant of the cold area, 

 having been recorded from the following localities: — 



Locality 



(Stat. 84?). (Probably confounded 

 with stat. 87 according to Lund- 

 beck (17 p. 166) Lat. 64° 2' N. 



long, 5° 35' E 



Baffin Bay. Lat. 68° 08' N. long 



58° 17' W 



North of Faree and South of Jan 



Mayn : 

 (St. 141) Lat. 63° 22' N. long, 6° 



58' W 



(St. 143) Lat. 62° 58' N. long, 



7° 09' W 



Lat. 70° 32' N. long, 

 8° 10' W 



Depth 



Temperature 



Number of 

 specimens 



911 m. (clay) 

 169 fath = 309 m. 



679 fath = 1242 m. 

 388 fath = 710 m. 

 470 fath = 860 m. 



Between : 

 309—1242 m. 



(-f6°,5C)?^-l°,lC. 



0°,6 C. 

 0°',4 C. 



-^-0°,4C — =-l°,lC. 



14 



Total 18 



Litterature 



Norw. North Atlant-Exp. Ill, Spong. 



1885, p. 7—8, p. 12. 

 "Vega" Exp. Vetensk. laktt. VI, 



1887, p. 460. 



Danish Ingolf-Exp.. vol. VI, Part. 2, 

 1905, p. 168. 



(East Greenland-Exp. 1891—92) 

 (Vide: Ingolf-Exp. 1905). 



Locality: The "Michael Sars" specimens are from the Faroe-Channel. (Lat. 60° 57' N, long, 4° 38' W). 

 1098 m. Blue mud. 



Dendoricella abyssi (Topsent) Lundbeck var nov. 



Svn: Desmacidon abyssi Topsent 41, p. 204. 



(PI. II, fig- 4). 



St. 10. One specimen. 



A grey clubshaped sponge of rather firm consistency, 

 3.5 cm. long and 2.3 cm. broad by 1 cm. thick, somewhat 



restricted at the base so as to form a short stalk-like 

 attachment fixed to a stone. One rather large osculum, 

 5 mm. in diameter, has a somewhat folded margin at 

 the summit. Perhaps there were more oscula, but as the 

 upper part of the sponge is somewhat damaged, this 

 cannot be determined. The surface is shaggy and has a 



