8 



E. ARNESE.N. 



[REP. OF THE "MICHAEL SARS" NORTH 



dermal surface is much abraded, exposing the parenchy- 

 mal strands. The thin-edged, circular, parietal apertures, 

 arranged in somewhat irregular oblique rows, have a dia- 

 meter up to 5 mm. 



Spiculation. As to the spiculation: I have obser- 

 ved all the spicules figured by Schulze (26 & 29) and 

 Ijima 11, except the graphiocomes, which were not 

 found, though carefully looked for in several specimens: 

 Onychasters, 0.111 — 0.147 mm. in diameter, and gene- 

 rally with, only two secondary branches were observed in 

 abundance and lophocomes, though, fewer in number, 

 0.145 — 0.185 mm. in diameter. In the sieveplate-border 

 the characteristic oxypentactins with unequal rays (fi- 

 gured 1 1 pi. V, fig. 5, fig. 6) were present and in the free 



edge of the cuff sword-like hexactins, like those figured 

 in pi. XIII, fig. 2 26, the distal rays of which project as 

 marginal prostalia. Bristle-like prostalia as indicated 

 by Schulze and Filhol I have not observed. 



In the dermal surface — though much abraded — the 

 typical hexacts, reproduced in 11 fig. 23 & fig. 24 pi. X, 

 were found and in the gastral surface pentactins. 



Geographical distribution. Regadrella phoenix 

 has a wide geographical range. Thus, besides having 

 been obtained at several stations in the Atlantic, — as the 

 following list shows, — it has also been recorded from the 

 Pacific by "Albatross" 29 Galapagos, 717 m. and off 

 the Coast of Chili, 3200 m., and in the Indian Ocean 

 by the "Valdivia" 30 Nicobar, 805 m., 1 basal cup. 



List of the localities in the Atlantic, where Regadrella phoenix has been recorded: 



Date 



Locality 



Depth 



Number of 

 specimens 



Name of 

 expedition 



1880 



Near the Lesser Antilles : 

 / Santa Crux 



453 m. 



1 Skeleton 





1899 



1 Barbados .„. 



St. Lucia and St. Vincent 



404—526 m. 

 514 m. 



"Albatross" 



1895 



1896 



1902 

 1885 



1896 



1910 



Near the Azores: 



Coast of Morocco-) 

 Gulf of Gascony 



Spanish Bay: 

 35" 32' N., 7" 7 W. 



861 m. 



1022 m. 



1360 m. 



1250 m. 

 882 m. 



1220 m. 

 1410 m. 



1215 ra. 



1 mutilated base 



2 bases and 

 several fragments 



1 macerated 

 fragment 



2 fleschy bases 



Fragments 



Several 

 magnificent speci- 

 mens in perfect 

 condition 



7 and several 

 fragments 



Literature 



'L'Hirondellc" 



"Princesse Alice" 



"Talisman" 



O. Schmidt: Spongien des Meer- 

 busens von Mexico Bd. II 1880 

 p. 61. 



F. E. Schulze: Amerikanischc 

 Hexactinelliden nach dem Mate- 

 riale der Albatross-Expedition 

 Jena 1899 p. 20. 



E. Topsent: Spong d. LAtlant 

 nord.- Result camp, scient. du 

 Prince Monaco. Fasc. II 1892 

 p. 25.') 



E. Topsent: Spong. des Acores. — 

 Result, camp, scient. du Prince 

 Alonaco Fasc. XXV 1904 p. 39. 



H. Filhol: La vie au , fond des 

 Mers. Paris 1885, p. 284. 



.E.Topsent: Result, sci. cam. du 

 Caudan. Annal. Univers. Lyon: 

 1896, p. 275. 



') In the work cited Regadrella phoenix O. Schmidt has been identified with Rhabdodictyum delicatum O. Schmidt. 

 -) It Regadrella phoenix O. Schmidt be synomymous with Trichaptella elegans Filhol (37 p. 276) as Topsent suggests but' as 

 Schulze (29 p. 22) doubts. •' 



