275 
canals, very narrow. 8 gonads, along the canals, in younger in- 
dividuals linear, in mature specimens folded; the gonads begin 
somewhat below the base of the manubrium and reach nearly to 
the bell margin (comp. Vanhåffen 1902 b Taf. X, fig. 20 and 
p. 64). The tentacles are short, ca. 64 in number, all of the 
same shape and size. The number of sense organs cannot be 
determined exactly, it seems to be fairly large. Velum is very 
large, often ca. 3 mm. broad. — The preserved specimens are 
colourless or faintly reddish, very iridescent, but in the journals 
of the Tjalfe” Expedition this species is noted as "the medusa 
with the red spot”, that means that at least the eight-angular base 
of the manubrium has been red in the living specimens; moreover, 
Maas states, that in the specimens of the ””Siboga'”” Expedition the 
red colour was frequently only indicated, In fact, I have not the 
slightest doubt but that "the medusa with the red spot” from the 
Davis Strait belongs really to Pantachogon rubrum Vanhåffen. 
A. G. Mayer (1910) is inclined to suppose, that this species 
is identical with P, Haeckelii Maas, because, setting aside the 
colour, no deciding difference seems to be present. Maas, on the 
other hand, having examined both species, maintains, that they 
are not identical; probably it will be impossible to give any 
decided answer to the question, while only two specimens have 
been captured of P. Haeckelii. 
Pantachogon rubrum Vanhåffen was found by the Valdivia” 
Expedition in the great depth of the Guinea region from about 
14? N. Lat. towards Congo; it was wanting round South Africa, 
but was found again abundantly south of Africa from 55? 27' S. Lat. 
to 649 14' 8, Lat., the southernmost station of the expedition. It 
Was also taken in the tropical Indian Ocean by the same expedition. 
Maas found it again in the material of the "Siboga” Expedition 
from the Indian Ocean and the Malayan Archipelago. (See Addenda). 
The description of Pantachogon Haeckelii Maas (1893) was 
based on one single specimen, caught by the '"Plankton-Expedition” 
in the Irminger Sea, about 60? N. Lat. Later Maas has found 
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