466 MR. DB, T, BROWNE ON [Mar. 17, 
medusa. By this it may be distinguished from another uni-tenta- 
cular medusa—Euphysa aurata. 
The aboral end of the umbrella varies in shape. In some speci- 
mens 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 little 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 some- 
times 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 mm. in length and 3 mm. in width. 
Disrrisurion., Norway, Sars (H). Heligoland, Hartlaub (H,M); 
Haeckel (M). 
Scotland—Orkney Islands, Forbes & Goodsir (H). Shetland 
Islands, Allman (H); Forbes (M). St. Andrews, Crawford (M). 
Firth of Forth, Allman (H, M). 
England—Seaham Harbour, Hodge (H). Plymouth, Heape (H); 
Allen (H, M); Garstang (M). Fowey, Alder (H); Peach (M). 
Penzance, Forbes (M). Mersey Estuary, Hincks (H). Isle of Man, 
Alder (H); Browne (M). 
ee ene Haddon (H, M). Valencia Island, EZ, 7. B. 
(M). 
Fam. HYBOCODONIDG. 
HYBOCODON PROLIFER, 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). 
