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Show 466 MR. E. T. BROWNE O N [Mar. 17 medusa. By this it may be distinguished from another uni-teuta-cular medusa-Euphysa aurata. The aboral end of the umbrella varies in shape. In some specimens it is round, and the process is conspicuous by its spine-like appearance ; in others there is a gradual slope from the side of the umbrella to the apex of the umbrella, forming a cone-shaped summit. The manubrium is about two-thirds the length of the umbrella-cavity; occasionally, when fully expanded, it may reach a httle way beyond the margin. The mouth is round, without lips. The stomach is attached to a short peduncle. From the base of the stomach an apical stalk is always present and runs up into the spine-like process of the umbrella. On the margin of the umbrella there is only one large perradial tentacle, ringed with nematocysts, and when fully expanded is about four times the length of the umbrella. Three other perradial bulbs, long and narrow, without tentacles, curl over the margin of the umbrella. The colour of the medusa shows little variation : the tentacle, bulbs, and stomach are usually of a light pinkish colour, but sometimes reddish brown. In some of the largest specimens the extreme apex of the spine-like process may be slightly tinged with a pinkish colour. The size of the umbrella varies according to age; the youngest specimens taken in the net measured about 1 mm. in length, the umbrella of the largest measured 6 mm. Many were taken about 5 m m . in length and 3 m m . in width. DISTRIBUTION. Norway, Sars (H). Hehgoland, Hartlaub (H,M); Haeckel (M). Scotland-Orkney Islands, Forbes Sf Goodsir (H). Shetland Islands, Allman (H); Forbes (M). St. Andrews, Crawford (M). Firth of Forth, Allman (H, M ) . England-Seaham Harbour, Hodge (H). Plvmouth, Heape (B); Allen (H, M ) ; Garstang (M). Fowey, Alder (H); Peach (M). Penzance, Forbes (M). Mersey Estuary, Hincks (H). Isle of Man, Alder ( H ) ; Browne ( M ). Ireland-Kingstown, Haddon (H, M ) , Valencia Island, E. T. B. (M). Fam. H Y B O C O D O N I D J E. HYBOCODON PROLIPER, Agassiz. Hydroid Form. Hybocodon prolifer, Agassiz * (1862); Allman* (1872). Corymorpha prolifer, Haeckel (1879) [Medusa= Hybocodon prolifer], Medusoid Form. Hybocodon prolifer, Bohm (1878) ; Crawford (1895). Coryne (Corymorpha) fritillaria, Steenstrup (1842). Diplonema islandica, Greene (1857). Steenstrupia owenii, Greene (1857). Steenstrupia globosa, Sars, M . (1859) ; Sars (1877). Amphicodon fritillaria, Haeckel (1879); Browne (1895). |