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DISTRIBUTION. I Ihunting grounds. Arrived here, the collector should be careful to securemore especially portions of all the more finely divided plants, such asMyriopJiyllum and Ceratophyllum, these affording favourite fulcra of attachmentfor the sedentary species belonging both to the Ciliate and Flagellatesections of the class, and being especially suited in consequence of theirslender contour for subdivision and transference to the glass slide orzoophyte trough for examination. Living plants, however, by no meansexhaust the category of material to be secured. Dead leaves, from adjacenttrees, that have fallen into the water, and are passing rapidly into decay,are often covered on their lower surfaces with the extensive slime-likecolonies of Vorticella campanula or Epistylis grandis. Specimens of thealmost always numerously represented Entomostraca, Cyclops and Canthocamptus,or higher crustacean forms such as Asellus and Gammartis, aslikewise all larvae of aquatic Insects, Mollusca, and even Annelida, shouldbe brought home and diligently examined, for some one or more of themany parasitic or pseudo-parasitic species recently referred to. Thefamily of the Daphniadae or " water-fleas," as exceptions, are rarely theentertainers of infusorial guests.Ponds of smaller pretensions, presenting only a superficial layer ofduckweed, or stagnant ditches with a surface of brilliant green or othercoloured slime, may always be visited with advantage. In the latterinstance, some representative of the social Euglenidse, or possibly Peridiniidae,is usually to be encountered ;while in the former one the pendentrootlets of the floating duckweed will in most cases be found to support aperfect forest-growth of Vorticellcs and other Infusoria. Restlesslywanderingamong the floating leaves of this gregarious plant, numerous Oxytrichidae,Tracheliidae, and not unfrequently Urocentrum turbo will rewardresearch, while the interstices of the decaying leaves may be examined forexamples of the singular genera Stichotricha and Chcetospira. In the pondsof our metropolitan parks and commons that so abound with variousaquatic Ranunculi, the various species of brilliantly coloured Stentorsor "trumpet-animalcules" are commonly met with, their social coloniesoften forming thin coloured incrustations on the minutely divided leafletsof the plants in question that are conspicuously visible to the unassistedeye. Lastly, in connection with fresh-water habitats, the upland ponds andmarshes abounding with Sphagnum, Drosera, and other bog-plants, are richhunting grounds that have as yet been but very imperfectly examined, andmay be expected to yield a rich infusorial fauna to the investigator. Asthe result, indeed, of a few brief hours recently spent by the author on theoutskirts of Dartmoor, the two new and highly remarkable Flagellate types,described later on under the titles of Rhipidomonas Huxleyi and Spongomonassaccuhis, were obtained.For the collector sojourning at the seaside, an almost equally unexploredhunting ground is thrown open. Some of the most prolific habitats inthis instance are afforded by the living polyparies of the Hydrozoa and