LIMNOCODIUM (CRASPEDACUSTES) SOWERBII, o53 
“ Gonads. Four oval sacs depending into the cavity of the 
subumbrella from the four radial canals. 
“The above characters are derived from the examination of 
adult male specimens, which were freely discharging ripe, 
actively motile spermatozoa. 
“ Species. — C, Sowerbii. 
“I name the species in honour of Mr. Sowerby, who dis- 
covered it, and to whose observation and courtesy zoologists are 
much indebted. The sole character, which I can give as specific 
over and above the generic characters summarised above, is that 
of size. The diameter of the disc does not exceed half an inch. 
“ Locality . — The water-lily tank in the gardens of the Bo- 
tanical Society, Regent’s Park, London. Very abundant during 
June, 1880. Probably introduced from the West Indies.” 
On June 17th, the same day as that on which the above 
appeared in ‘ Nature,’ the same organism was described by Prof. 
Allman to the Linnsean Society ; and in the following week 
(June 24th) an article was published by Prof. Allman in 
‘ Nature,’ which was an extension of the paper read by him to 
the Linnaean Society, including, “ some facts, in addition to 
those contained in his original paper.” Professor Allman’s 
observations agree very closely with my own reproduced above, 
though we differ on one or two important points, and especially 
on the relationship of the new Medusa to Trachomedusae, on the 
one hand, and liptomedusse on the other, with which latter 
group Professor Allman thinks it has most affinity. 
Inasmuch as Professor Allman gave his account of the new 
Medusa at the Linnsean Society on the same day as that on 
which mine was published in ^ Nature,’ and on account of the 
regard which all zoologists must feel for him, I propose as a 
mark of respect to him to accept the generic name Limnocodium 
which he bestowed upon the new Medusa in place of Craspeda- 
custes which has the right of priority. At the same time I shall 
maintain the specific title ' Sowerbii,’ in recognition of Mr. 
Sowerby’s discovery and his valuable observations on the habits 
and on the embryonic condition of this Medusa. 
Ill the following pages I propose to describe a few important 
facts relative to the structure of Limnocodium, which in my 
judgment suffice to establish its position as one of the Tracho- 
medusae, though it is quite a peculiar form and very possibly is 
either the isolated representative of an archaic type of that order, 
or has degenerated in connection with its exceptional life-condi- 
tioni, namely, those of fresh water. 
The facts to which I shall on the present occasion draw atten- 
tion, relate to the structure of the marginal ring of the disc, the 
insertion of the tentacles and the structure and development of 
