OT 
B. PORIFERA NON-CALCAREA. 
Although there have been found true Ceraospongiae in the Arctic 
Ocean, . ... Marenzeller!) f. i. desceribes a Cacospongia, ... - 
the first two expeditions of the „Willem Barents” have not brought 
any specimens. All are so-called Siliceous Sponges, among which, 
as will be seen, very interesting ones and many new species, 
9. Thenea muricata (Bwk.) Gray. [Pl. I, figg. 1—8; pl. U, 
figg. 1—21; pl. IV, figg. 114 and 115]. 
Diagn. Corpus quasi globosum, cum uno vel pluribus ciliorum pro- 
tectis. Spongia limo per radicibus inhaerens. Spieula indi- 
cantia: ac?. | M. ta. | M. ta.d. bif. | st. | st?. | 
Loc. Lat. 60° 52' 30" N.; long. 1°42'6' B.; (May 24, 1878). 
aa u 450 : 
a0: (0- n „25° „ 
Be lemalaı 21a. :90230'5 © „eluly:aK,1879). 
Geogr. distrib. Aretie Ocean; Atlantic Ocean; Mediterranean. 
Depth. 130—220 Fathoms. 
Synon. and literature. 
1858. Tethea muricata Bwk. 
(Bowerbank, Phil. Transact. Vol. CXLVIII part. 2, pag. 
308, tab. XXV fig. 18). 
1867. Thenea muricata Gray. 
(Gray, Proc. Zool. Soc. pag. 541). 
? 1869. Normania crassa {Bwk.) 
-  (Bowerbank, Report Brit. Assoc.) 
1869. Tisiphonia agariciformis Wyv. Thoms. 
(Wyville Thomson, Ann. and Mag. IV.) 
1870. Dorvillia agariciformis Sav. Kent. 
(Saville Kent, Monthly Microse. Journ. IV). 
1) Die Coelenterata, Echinodermen und Würmer der O0. U. Nordpol-Exped. 
in Denkschr. Akad. Wien. XXXV (1877) pag. 6. 
