. T HYDROMEDUSAE FROM THE DISCOVERY COLLECTIONS By P. L. Kramp Zoological Museum, Copenhagen, Denmark (Plates I-VII, text-figs. 1-19) INTRODUCTION HE Discovery collections of Hydromedusae dealt with in the present paper comprise 85 species, namely, 25 Anthomedusae, 19 Leptomedusae, 4 Limnomedusae, 22 Trachymedusae, and 15 Narcomedusae. The following species, the type specimens of which are in the British Museum (Natural History), are described as new: Euphysora gigantea Leuckartiara annexa Ectopleura sacculifera Russellia mirabilis , Rathkea africana Amphogona
. T HYDROMEDUSAE FROM THE DISCOVERY COLLECTIONS By P. L. Kramp Zoological Museum, Copenhagen, Denmark (Plates I-VII, text-figs. 1-19) INTRODUCTION HE Discovery collections of Hydromedusae dealt with in the present paper comprise 85 species, namely, 25 Anthomedusae, 19 Leptomedusae, 4 Limnomedusae, 22 Trachymedusae, and 15 Narcomedusae. The following species, the type specimens of which are in the British Museum (Natural History), are described as new: Euphysora gigantea Leuckartiara annexa Ectopleura sacculifera Russellia mirabilis , Rathkea africana Amphogona apicata Merga rubra Many species are represented by numerous specimens, but these do not represent the total numbers caught in the nets, but only those picked out from the samples and sent to me for examination. Under each species are given the most important references to the literature, a list of stations where the species was collected, its history (where necessary), some remarks on the morphology (except in the case of very well-known species) and the geographical distribution. The lists of stations usually comprise all details of date, depth, etc., but in the case of 17 of the most common species these are given in tabular form in Table i. The specimens are preserved in formalin, and in comparison with the collections from most other great expeditions the state of preservation is generally very satisfactory, so that it has been possible to make valuable additions to our knowledge of the morphology of several species. Most species of Narcomedusae are, however, extremely fragile, and unfortunately within this group many specimens were indeterminable. However, the collection of Narcomedusae is extensive, and from the material in more or less fair condition and representing several species I have been able to make important progress towards a revision of the species belonging to the genera Pegantha, Solmissus and Cunina, by means of characters to which little atte
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