464 MR, E, T. BROWNE ON [Mar. 17, 
Sars * (1877); Haeckel (1879); [medusa= Hybocodon nutans | 
Haddon (1885) ; Hincks (1886); Hartlaub (1894) ; Allen* (1895). 
Corymorpha galanthus, Haeckel (1879). 
Medusoid Form. 
Corymorpha nutans, Allman (1863); Garstang (1894); Crawford 
(1895). 
_ eens rubra, Forbes (1848); Peach (1849); Haddon 
(1885) ; Browne (1895). 
Steenstrupia flaveola, Forbes (1848). 
Steenstrupia galanthus, Haeckel (1879) ; Hartlaub (1894). 
The hydroid form of Corymorpha nutans with medusa-buds was 
first described by Sars from specimens taken on the Norwegian 
coast. Forbes and Goodsir a few years later added the hydroid to 
the British list by finding specimens off the Orkney Islands. 
Hodge has described specimens from Seaham Harbour and Allman 
from the Firth of Forth. 
Allman, Hincks, Hodge, and Johnson consider the British species 
to be that described by Sars, and call it Corymorpha nutans. 
Haeckel, however, states that the Norwegian species is quite 
distinct from the British species. He retains the name Cory- 
morpha nutans for the Norwegian hydroid and calls the medusoid 
Hybocodon nutans. The English species has been given the new 
name of Corymorpha galanthus and its medusoid called Steenstrupra 
galanthus ; under the latter name Haeckel places the medusoid 
Steenstrupia rubra, Forbes, as a synonym. 
This separation is entirely based upon the shape of the umbrella 
of the medusa. Sars described the young medusa upon the hydroid 
as having an oblique margin to the umbrella, like Hybocodon pro- 
lifer. This has led Haeckel to place the medusa in the genus 
Hybocodon. 
Haeckel apparently, judging from his references, has only read 
the description of the English species in the monographs by 
Hincks and Allman. In these, the margin of the umbrella is 
described and figured as occupying its normal position at right 
angles to the longitudinal axis of the umbrella, and no mention is 
made of the obliqueness of the margin of the umbrella of the 
medusa whilst attached to the hydroid. But in the original papers 
published by Hodge (1861) and by Allman (1863) on the hydroid 
Corymorpha, the medusa is described with an oblique margin to 
the umbrella; it therefore corresponds with the description given 
by Sars. Hodge gives figures of the meduse upon the hydroid, 
and the margin is shown to be distinctly oblique. He not only 
figures the meduse upon the hydroid but gives an excellent 
figure of the free-swimming form, just liberated from the hydroid 
kept in his aquarium. The free-swimming medusa, as figured by 
Hodge, has the margin at right angles to the longitudinal axis 
of the umbrella ; therefore it cannot be oblique. Allman (1863), 
in his original description of Corymorpha, on the development of 
the medusa states :—‘ The four peripheral processes continue to 
