NARRATIVE OF THE CRUISE. 
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depth of 1 100 fathoms, and Periphema regina, 180 to 200 mm. high, and about the same 
in breadth, in the lat. 62 : Southern Ocean, when the depth was 1975 fathoms. Two 
other remarkable deep-sea Medusae discovered by the Challenger are Nauphanta chal- 
lengeri (from Tristan da Cunha, depth 1425 fathoms) and Atolla ivyvMii, both belonging 
to the group of Ephyridae, which are the oldest of the Discomedusae, and are nearly 
related to Ncmsithoe. Atolla seems to be very widely distributed in the deep sea. 
It was captured in the Antarctic Ocean (Station 157, depth 1950 fathoms) and also in 
the South Atlantic Ocean (Station 318, depth 2040 fathoms). In August 1882 it was 
again found by Mr. John Murray in the Faeroe Channel, at a depth of 430 to 640 
fathoms.” 
