115 



hvormed Æggenes Skal er fdrsynet, liar rimeligvis 

 sin Betydning for Æggenes Spredning. Naar Dam- 

 mene torrer ud, vil nemlig Æggene derved sammen 

 med det opsmuldrede Mndder let kunne livirvles op 

 af Avinden og fores afsted i storre Afstande. En 

 saadan Spredning af Æggene ved A'indens Hjælp 

 har jeg ugsaa troet at kunne constatere paa Mærdo. 

 Fornden i Storekjær% som synes at være det Sted, 

 hvortil denne Form oprindelig har været indskræn- 

 ket, paatraf jeg den paa dere andre Punkter af 

 Øen, tildels i en meget lietvdelig 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 

 (im der skal ganske særegne Betingelser til, for at 

 denne Phyllopode skal kunne trives. Thi der var 

 adskillige Smaadamme ]iaa Hen, tildels lige i Nær- 

 heden af «Storekjær», hvor intetsomhelst Spor af 

 den kunde opdages, skjondt 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 (rrofter ved Strassbiirg, hvor den 

 ogsaa senere er fundet af v. Siebold. Brogniart 

 fandt 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 Blekings og, ifolge samme Forsker, oj^bevares i 

 Stockholms Mnseum Exemplarer fra Stockholms Om- 

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

 son tåget den i Bolmslan. Dens Udbredning stræk- 

 ker sig altsaa til folgende europæiske Lande : Norge, 

 Sverige, Ty.skland og Frankrig. Andetsteds er den, 

 saavidt mig bekjendt, ikke paatrutfet, medmindre, 

 som jeg er tilboielig til at tro, den amerikanske 

 Form, Lhnnadia americana Morse, skulde vise sig at 

 være identisk med vor Art. 



shell of the egg is provided liave probaldy their signi- 

 ficance in the distribution of the eggs. When the 

 ponds dry up, the eggs, together with tlie pulverised 

 mud, may be easily caught up by tlie 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 tlie place to which tliis 

 form has originally been confined, I met with it at 

 several other ])oints of the island, sometimes at a 

 very considerable distance from the above-named 

 little lake, and sometimes in such small and shallnw 

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

 wise than tliat eggs have been ipiite accidentally 

 carried thither from «Storekjær»', liy tlie wind. It 

 apjiears, however, tjiat very special conditions are 

 requisite if this Phyllopod is to thrive ; for there 

 were numerous small ponds on the island, some in 

 the immediate neighbourliood 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 Phyllojjod. 



Distribution. — This species was fir.st discovered 

 by Herman in shallow ditches at Strasslnirg, where 

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

 niart found it in small lakes at Fontainebleau, and 

 Grube rejiorts it also from the neighbourhood of 

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

 Spangenberg at Neustadt, in Mecklenburg. In Swe- 

 den, it was found in the summer of 1871, b}^ 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 Hallands Vadeni. Finally, Dr. 

 Hansson lias taken it in Bohuslan. Its distribution 

 thus extends over the following European countries; 

 Norwajs Sweden, Grermany and France. Elsewhere 

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

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

 Limnadia americana, Morse, should prove to be iden- 

 tical with our species. 



