[19] MEDUS© FROM THE GULF STREAM. 531 
verrillii we find several specimens with twenty-eight. Why Heckel 
has assigned from sixteen to thirty-two tentacles to the Collaspidze does 
not appear from what we already know of the genera (Collaspis and 
Atolla) which compose the family. The least number of tentacles ob- 
served in any of my Atolle is twenty-two. Heckel records an Atolla 
with nineteen tentacles. The greatest number of tentacles observed in 
any Afolla is twenty-eight in my species verrillii. It is not denied that 
it is possible that Atolle with less than nineteen or more than twenty- 
eight tentacles may be later observed, but until these are found it is well 
to include the limits in the number observed (nineteen, teste Heckel), 
twenty-two to twenty-eight. 
The deepest limit in the ocean at which Atolla has been recorded is 
2,369 fathoms. Many specimens are recorded from the surface. Atolla 
has been found by the Albatross within the following geographical 
limits: Lat. 38° 19’ 26” to 42° 46’, long. 50° 55’ 30” to 71° 58’. The 
Albatross has collected thirteen specimens of the genus. 
The genus Collaspis, Heck., of which several drawings are pub- 
lished by Heckel (System der Medusen, Pl. xxviii), was collected “by 
Smith” between Kerguelen and Crozet Islands in “ about 1,000 fath- 
oms,” according to Heckel. The expedition upon which this specimen 
was collected is not mentioned, but the great depth from which it is 
said to have been taken excites more than usual interest init. Very 
few, if any, other hauls besides those of the Challenger have been made 
wt this depth in this remote locality, and this seems to be the only 
medusa ascribed to ‘* Smith” from this locality. Heckel’s description 
of Collaspis was made from a very much mutilated specimen, which he 
reconstructed from his knowledge of Atolla, and allowed a drawing of, 
the medusa thus reconstructed to be published. On account of what 
might be regarded as suspicious circumstances, under which Heeckel’s 
description of Collaspis was made, the genus is not recognized. — 
According to Fijhol (La Vie au Fond des Mers, p. 244) Atolla is found 
“dans Atlantique sud et dans Atlantique nord au niveau du canal 
des Faréer.” The species of the Atolla, from the latter locality, is not 
mentioned by Filhol, and it is probably the same as one of mine, A. 
bairdiit or A. verrillit. 
The increase in number of specimens from the surface would indicate 
that Atolla is found on the surface of the ocean as well as at great 
depths. The data for this statement are those of the collector. I have 
already discussed the limitations which necessarily exist to a rigid 
acceptance of the recorded depths ascribed to this and other so-called 
deep-sea medusee. 
