. Bulletin - United States National Museum. Science. 184 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. The following table shows the range of the 174 species of Scypho- medusae, not counting varieties, described in Mayer's Medusae of the World. Confined to the Tropics 77 Ranging from Tropics to Temperate regions 16 Ranging from Tropical to Polar regions 2 Confined to the North Temperate region 32 Confined to the South Temperate region 11 Ranging from Temperate to Polar seas 6 Confined to the Arctic Ocean 7 Confined to the Antarctic Ocean 7 Deep sea medusae all of wide range 16 Total 174 In this
. Bulletin - United States National Museum. Science. 184 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. The following table shows the range of the 174 species of Scypho- medusae, not counting varieties, described in Mayer's Medusae of the World. Confined to the Tropics 77 Ranging from Tropics to Temperate regions 16 Ranging from Tropical to Polar regions 2 Confined to the North Temperate region 32 Confined to the South Temperate region 11 Ranging from Temperate to Polar seas 6 Confined to the Arctic Ocean 7 Confined to the Antarctic Ocean 7 Deep sea medusae all of wide range 16 Total 174 In this table the Mediterranean is designated " North Temperate " and the Red Sea " ; In the " Tropics " the surface tempera- ture in summer is above 70° F. (21° C). The summer temperature of " Temperate Region " ranges from 70° F. to 50° (21° to 18° C), and that of the " Polar Seas " below 50° F. (10° C). 'i'/i^I r \ \ \ ^Uk) As is shown, 44 per cent of the mi jMlOll'il^Wn^^ known Scyphomedusae appear to be confined to tropical waters and only two species, Aurellia aurita by the author. Naples Zoological and possibly Nausithoe punctata STATI0N- (fig. 1) range from Tropical to Polar Seas. Indeed most of the scyphomedusae are confined within rather narrow temperature ranges, the only considerable number of widely ranging forms being the deep sea species whose habitat has about the same temperature whether under the Equator or in the Polar regions. Incidentally the table seems to indicate our deficiency of knowledge of the South Temperate regions for it is probable that the numbers of species in the North Temperate are more nearly equal to those found in the South Temperate Zone. We may distinguish five main divisions or orders of the larger jelly fishes of scyphomedusae. 1. The Carybdeidae or Cubomedusae, with bell almost rectangular and with flexible tentacles mounted upon the ends of gelatinous wing- shaped expansions
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