Arafura Ska. 
sail. South point of Arrou Islands distant at noon. 366 miles. Made good 134 miles. 
Amount of current 6 miles, direction W. During the night sounded every two hours, 
the depths averaging about 30 fathoms, indicating the presence of the submarine plateau 
which connects New Guinea and North Australia. 
At 9.15 a.m. on September 11 shortened and furled 'sails, brought ship to wind, 
and put over trawl, which was sent down three times in depths varying between 
?5 and 29 fathoms, deposit Green Mud, containing 31 '13 per cent, of carbonate of lime 
(Station 189). At 9.30 a.m. lowered whaler to try current. At 11.30 a.m. completed 
trawling, many specimens being procured, and made sail. The carbonic acid was 
determined in bottom water, and amounted to 28*7 milligrammes per litre. Distance at 
noon from Ngor Island, south extremity of the Arrou Islands, 250 miles. Made good 
1 13 miles. Amount of current 10 miles, direction N. 84° W. 
At 1.45 i .M. on September 12 shortened sail, brought ship to wind, and put over 
trawl, which was sent down three times in about 49 fathoms, deposit Green Mud, 
containing 23*04 per cent, of carbonate of lime (Station 190). Many specimens were 
obtained, along with a log of wood completely bored by Pholadids. The colour of the 
wat< r hanged during the course of the afternoon from a light greenish-blue to a dark 
blue. At 5.10 p.m. completed trawling and made sail. In the evening a booby 
(Dys}x/rus sula) came on board the ship. Sea phosphorescent at night. Ngor Island 
distant at noon, 147 miles. Made good 111 miles. Amount of current 8 miles, direction W. 
A.M MAI > FROM 
IIrfdoe 
ami* Trawl. 
T i. following species are recorded in the Zoological Reports from these shallow- water 
dredgings and trawlings in the Arafura Sea : — 
Keratosa (Polejaeff, Zool. pt. 31). 
lanthrlla fiubdliformis (Pallas). Two specimens (Station 188); obtained at no 
other locality by the Challenger. 
Cacospongi/i irregularis n.sp. One specimen (Station 188); obtained at no 
other locality. 
Monaxomha (Ridley and Dendy, Zool. pt. 59). 
Iihizothal ina Jislulosci (Buwerbauk). Sixteen specimens (Station 188); obtained 
also at Station 73 and Bahia (?). 
> 'leroderi a nariceUigcnnn, u.g., n.sp. One specimen (Station 188); obtained at 
no other locality Only species of the genua. 
Cloth na frontl'frra (Bowerbank). One specimen (Station 188); obtained at no 
other locality by the Challenger. Recorded from 
Indian and Pacific Oceans. 
