444 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Remarks. — Gray instituted a new family, Xenospongiadse, and a new order, 
Arenospongia, for the special reception of this sponge ; Carter included it as a genus of 
his subfamily Donatina, of the family Suberitida ; later, while retaining it in the 
Suberitida he removed it from the Donatina and proposed a new subfamily, Xenospongina, 
to receive it. 
Vosmaer’^ thinks it not impossible that XeiiosiDongia patelliformis, Gray, is, if 
not identical with Polymastia liemispherica (Sars), Vosmaer, yet at all events very 
nearly related to it. It is certainly not identical, and the presence of asters would seem 
to preclude any very close connection ; if the two sponges should prove to be more 
nearly related than we at present think, an additional argument would be furnished 
for the Spintharophorous character of the Suberitidse. 
The sponge is no doubt very remarkable and aberrant, but till we know more of its 
structure, particularly of the cortex, its position must remain more or less doubtful ; in 
the meantime I place it with the Tethyidse, to which its spiculation appears to ally it. 
LIST OF STATIONS AT WHICH SPINTHAEOPHOROUS MONAXONID 
SPONGES WERE OBTAINED, WITH THE SPECIES FROM EACH. 
St. lago, Porto Praya, Cape Verde Islands;' August, 1873 ; depth, 100 to 128 fathoms. 
Astropeplus pulclier. 
Bahia. 
Scolopes moseleyi. 
Station 162. Off East Moncoeur Island, April 2, 1874; lat. 39° 10' 30" S., long. 
146° 37' 0" E.; depth, 38 fathoms ; bottom, sand and shells. Dredged. 
Tetliya ingalli, Bowerbank. 
Port Jackson; depth, 6 to 15 fathoms. 
Tethya ingalli. 
Station 186. Flinders Passage, September 18, 1874; lat. 10° 30' S., long. 142° 18' E.; 
depth, 8 fathoms ; bottom, coral mud. Dredged. 
Tethya seychellensis, E. P. Wright. 
1 Bronn’s Klass. u. Ord. d. Thierreichs, Porifera, p. 238. 
