E. ARNESEN. 



[REP. OF THE ..MICHAEL SARS" NORTH 



of 5 cm. in the broadest part. Externally it resembles 

 Wywille Thomson's second figure in the Challenger 

 Report (60 pi. V fig. 1), showing similar spiral series of 

 round parietal gaps alternating with series of meshes 

 closed by a flat arching of soft tissue, and the radial rays 

 of the strong pentacts from the longitudinal and circular 

 strands forming the underlying lattice-like meshwork pro- 

 ject in spiral rows as lateralia, 2 — 3 cm. in length. The 

 delicate marginal wreath consists of isolated spicules pro- 

 jecting outwards and upwards. 



Spiculation: As to the spiculation in the specimens 

 examined I find that the spicules on the whole correspond 

 well with those figured by Schulze (60 pi. V and pi. 



VI fig. 3). All the different forms of principalia, comitalia 

 and parenchymalia are present. 



It is specially noteworthy that the rough diacts with 

 the four rudimentary actines from the circular membrane 

 of the parietal gap — spicules characteristic of the species 

 —have been observed. in abundance with all their varia- 

 tions. But of the microscleres I have only been able to 

 observe with certainty the hexasters (80 //), the small 

 gastral and the large dermal floricomes resembling 

 those in 60 fig. 4 and fig. 5. All the other forms seem 

 to be absent. 



Geographical distribution. As will be seen from 

 the table E. suberea has a wide distribution in the Atlantic. 



Date 



1877 



1881 



1885 



1886 



1887 



1892 



1904 



1904 



Locality 



North of Scotland.. 



Off the Berlingness . 



North Atlantic . 



Depth 



6049 m. 



900-2300 m. 



Name of Expedition 

 or Authoraty 



West of Gibralter: (Lat. 36" 25' N. long, 1097 m. 

 8° 12' W.; Lat. 35° 47' N. long, 8" 23' W,)' 1994 m. 



Between Pernambuco and Bahia: (Lat. 10° 

 11' S. long, 35° 22' W.) 



Lat. 38" 23' 45" N. long, 30° 51' 30" W. 

 Lat. 39° 18' 5" N. long, 33° 32' 15" W. 

 Lat. 41" 40' 41" N. long, 29° 4' 23" W. 



Azores: 



Lat. 37" 54' N. long, 24" 43' 15" W. 



Lat. 39° 11' N. long, 30" 44' 40" W. 



Lat. 39" 51' N. long, 26" 54' 45" W. 



Lat. 39° 54' N. long, 29" 01' 45" W. 



S. W. of Cap Bojador: 

 Lat. 24° 35,3 N. long, 17" 4,7' W. 



Pembachannel Zanzibar 1 ): 

 Lat. 5° 24,0' N., 39" 19,8' E. long.. 



2926 m. 



927 m. 

 1372 m. 

 2870 m. 



2178 m. 

 1846 m. 

 1940 m. 

 1900 m. 



2500 m. 

 818 m. 



"Travailleur" 



'Talisman" 



Edmond Perricr 



'Challenger" 



■'Hirondelle" 



'Princesse Alice' 



'Valdivia" 



Litterature 



Wywille Thomson: 



The Voyage of the Challenger. 

 The Atlantic vol. I p. 138. 



Milne Edwards: 



Comptes rendus T. XCIII p. 871. 



H. Filhol: 



La vie au fond des mers p. 282. 



Edm. Perrier: 



Les explorations soumarines p. 337. 



F. E. Schulze: 



Rep. on Challenger Hexactinellida p. 76. 



Emile Topsent : 



Result. Camp, scient. Prince du Monaco. 

 Spongiaires de l'Atlantic nord. p. 24. 



Emile Topsent: 



Result. Camp, scient. Prince du Monaco. 

 Fasc. XXV Spongiaires des Acores, p. 38. 



F. H. Schulze: 

 Hexactinellida. 



Wiss. Ergeb. d. Deutsch Tiefsee-Exp. 

 "Valdivia". 



1910 Spanish Bay: 



Lat. 35" 34' N., 8" 



25' W. long. 



2300 



Globigerina 



Ooze 



'Michael Sars" 



l y Though not belonging to the Atlantic it is of interest to mention this locality here. — The specimen recorded from the Pembachannel 

 (figured pi. II fig. 15 op. cit.) and one specimen from off Cape Bojador (figured pi. II fig. 6 op. cit.) are in spite of differences in the spicu- 

 lation from the type referred to Eup. suberea with the remark, that it is doubtfull, whether they are to be reckoned "als Variationen innerhalb 

 des Speciesbegriffes Euplectella suberea W. Th. oder als typische Charaktere differenter, von dem alten durch Wyv. Thomson und mich 

 (Schulze) aufgestelite Artbegriff zu trennender Species zu gelten haben" (op. cit. p. 15). 



