115 



hvormed Æggenes Skal er forsynet, har rimeligvis 

 sin Betydning for Æggenes Spredning. Naar Dam- 

 mene tørrer ud, vil nemlig Æggene derved sammen 

 med det opsmuldrede Mudder let kunne hvirvles op 

 af Vinden og føres afsted i større Afstande. En 

 saadan Spredning af Æggene ved Vindens Hjælp 

 har jeg ogsaa troet at kunne constatere paaMærdø. 

 Foruden i «Storekjær», som synes at være det Sted, 

 hvortil denne Form oprindelig har været indskræn- 

 ket, paatraf jeg den paa flere andre Punkter af 

 Øen, tildels i en meget betydelig Afstand fra det 

 nævnte Tjern, og undertiden i saa smaa og grunde 

 Regnpytter, at det var umuligt andet end antage, 

 at Æg rent tilfældigvis med Vinden er overfort 

 hertil fra «Storekjær. Det synes imidlertid som 

 om der skal ganske særegne Betingelser til, for at 

 denne Phyllopode skal kunne trives. Thi der var 

 adskillige Smaadamme paa Øen, tildels lige i Nær- 

 heden af «Storekjær», hvor intetsomlielst Spor af 

 den kunde opdages, skjøndt disse Damme for andre 

 ,Entomostraceers Trivsel syntes at være meget gun- 

 stige. Dette synes ogsaa for en Del at kunne for- 

 klare denne Phyllopodes mærkværdig sporadiske 

 Forekomst. 



Udbredning. — Arten blev forst opdaget af 

 Herman i grunde Grofter ved Strassburg, hvor den 

 ogsaa senere er fundet af v. Siebold. Brogniart 

 faudt den i Smaatjern ved Fontaineblau, og Grube 

 anfører den ogsaa fra Omegnen af Breslau og Berlin. 

 Ligeledes er den af Dr. Spangenberg fundet ved 

 Neustadt i Mecklenburg. I Sverige blev den Som- 

 meren 1871 fundet af Prof. Lilljeborg ved Ronneby 

 i Blekinge og, ifølge samme Forsker, opbevares i 

 Stockholms Museum Exemplarer fra Stockholms Om- 

 egn og fra Hallands Vaderij. Endelig har Dr. Hans- 

 son tåget den i Bohuslan. Dens Udbredning stræk- 

 ker sig altsaa til følgende europæiske Lande : Norge, 

 Sverige, Tyskland og Frankrig. Andetsteds er den, 

 saavidt mig bekjendt, ikke paatrufPet, medmindre, 

 som jeg er tilboielig til at tro, den amerikanske 

 Form, Limnadia amer-icana Morse, skiilde vise sig at 

 være identisk med vor Art. 



shell of the egg is provided have probaljly their signi- 

 ficance in the distribution of the eggs. When the 

 ponds dry up, the eggs, together with the pulverised 

 mud, may be easily caught up by the wind, and 

 carried away to some distance. Such a distribution 

 of the eggs by the help of the wind, I think, too, 

 may be demonstrated at Mærdo. Besides in «Store- 

 kjær». which seems to be the place to which this 

 form has originally been confined, I met with it at 

 several other points of the island, sometimes at a 

 very considerable distance from the above-named 

 little lake, and sometimes in siich small and shallow 

 rain-pools, that it was impossible to assume other- 

 wise than that eggs have been quite accidentally 

 carried thither from «Storekjær», by the wind. It 

 appears, however, that very special conditions are 

 requisite if this Phyllopod is to thrive; for there 

 were numerous small ponds on the island, some in 

 the immediate neighbourhood of «Storekjær» where 

 no trace of it whatever could be discovered, although 

 these same ponds seemed to be very favorable to 

 the well-being of other Entomostraca. This also 

 seems partly to account for the remarkably sporadic 

 occurrence of this Phyllopod. 



Distribution. — This species was first discovered 

 by Herman in shallow ditches at Strassburg, where 

 it has since been found again by v. Siebold. Brog- 

 niart found it in small lakes at Fontainebleau, and 

 Grube reports it also from the neighbourhood of 

 Breslau and Berlin. It has also been found by Dr. 

 Spangenberg at Neustadt, in Mecklenlrarg. In Swe- 

 den, it was found in the summer of 1871, by Prof. 

 Lilljeborg, at Ronneby in Blekinge, and, according 

 to the same naturalist, there are in the Stockholm 

 Museum specimens from the neighbourhood of Stock- 

 holm and from Halland's Vadero. Finally, Dr. 

 Hansson has taken it in Bohuslan. Its distribution 

 thus extends over the following European countries: 

 Norwajs Sweden, Germany and France. Elsewhere 

 it has not, as far as I am aware, been met with, 

 unless, as I am inclined to think, the American form, 

 Limnadia americana, Morse, should prove to be iden- 

 tical with our species. 



