The sense-organs of the two fresh-water medusae Limnocodium and Limnocnida are peculiar and of rather doubtful nature '(see' E.
Of doubtful position, but commonly referred to the Trachylinae, are the two genera of fresh-water medusae, Limnocodium and Limnocnida.
Limnocodium sowerbyi was first discovered in the Victoria regia tank in the Botanic Gardens, Regent's Park, London.
It is a re markable fact that all specimens of Limnocodium hitherto seen have been males; it may be inferred from this either that only one polypstock has been introduced into Europe, from which all the medusae seen hitherto have been budded, or perhaps that the female medusa is a sessile gonophore, as in Pennaria.
It differs from Limnocodium in having practically no manubrium but a wide mouth two-thirds the diameter of the umbrella across.
Limnocodium by S.
Allman, on the other hand, referred Limnocodium to the Leptomedusae.
The polyp-stages of Limnocodium and Microhydra are extremely similar in character.
In Limnocodium the body secretes a gelatinous mucus to which adhere particles of mud, &c., forming a protective covering.
In view of the great resemblance between Microhydra and the polyp of Limnocodium, it might be expected that the medusae to which they give origin would also be similar.
As yet, however, the medusa of Microhydra has only been seen in an immature condition, but it shows some well-marked differences from Limnocodium, especially in the structure of the tentacles, which furnish useful characters for distinguishing species amongst medusae.
The possession of a polyp-stage by Limnocodium and Microhydra furnishes an argument against placing them in the Trachylinae.
" On the Freshwater Medusa liberated by Microhydra ryderi, Potts, and a Comparison with Limnocodium," Quart.
Limnocodium sowerbyi was first discovered swimming in the tank in which the water-lily, Victoria regia, is cultivated in Kew Gardens, and ' C. L.