340 Miscellaneous. 



meric series comparable to that of the segmental organs iu the 

 Worms. — Compti's liendus, t. cxv. no. 3 (July 18, 1892), pp. 191- 

 193. 



On the Freshwater Fauna of Iceland. 

 By MM. Jules de Guerne and Jtjles Richard. 



In spite of their extreme abundance, and although numerous 

 explorations have been made in the country, the fresh waters of 

 Iceland have never been properly studied from a zoological point of 

 view. M. Charles Rabot was able partly to supply this deficiency 

 in the course of a scientific mission carried out in 1891, during the 

 months of July and August. The collections were made in three 

 different districts of the island: — (l)in the north, at Akureyri ; 

 (2) in the west, in the vicinity of Reykjavik ; (3) in the east, in the 

 region of the Eskifiord. The examination of them enables us to 

 add twenty-nine species to the Icelandic fauna, among which the 

 Entomostraca, which are by far the most numerous, amount to 

 twenty-six (16 Cladocera. 8 Copepoda, 2 Ostracoda). The remainder 

 include only 2 Rotifera and 1 Protozoon. Not one of these forms 

 is new, but several of them are of genuine interest for different 

 reasons which are stated below. 



It is worth noticing in the first place that a certain number of 

 species which are common throughout the whole of Europe (and 

 even in the United States) are found in the three regions of Iceland 

 visited by M. Rabot. These are Simocej^halus vetulus, O.-F. Miillcr ; 

 Alona ajinis, Leydig ; Chydorus spho'ricns, Jurine ; Cyclops strennus, 

 Fischer; C. viridis, Fischer; and 0. senmlatus, Fischer. Certain 

 other forms, which are likewise very widely distributed in Europe, 

 appear to be rarer in Iceland. Daphnia lonyispina, Leydig, D.jjuIcv, 

 de Geer, and Cypris puhera, O.-F. Midler, for instance, were only 

 found in the Lake of Rej'kjavik in the case of the first, and at 

 Akureyri in that of the other two. On the other hand, Eurycercus 

 lamellatus, O.-F. Midler, Acrop>erus leii,cocephalus, Koch, PJeuroxus 

 excisus, Fischer, and Polyphemus pedicidus, de Geer, are absent only 

 in the latter of these localities. Alona testudinaria, Fischer, a 

 tolerably rare form, and Cyclops fuscus, Jurine, were only found in 

 the east. Pleuroxus nanus, Baird, on the contrary, was met with 

 only in the western region. Cyclops fimbriatus, Fischer, lives in 

 the pit of a spar-mine near Eskifiord equally as well as in the waters 

 of the Laugarvatn, where there is also found, just as in the Lake of 

 Reykjavik, an undetermined species of Canthocamptus. Cypris 

 acideata, Lilljeborg, is found in great abundance on the shores of the 

 same lake. 



Near Rejkjavik, in Lake Thingwalla, which is the largest in 

 Iceland, M. Rabot collected the following Crustaceans : — Scapho- 

 leheris mucronata, O.-F. Miiller ; Bosmina arctica, Lilljeborg ; 

 Eurycercus lamellatus, O.-F. Miiller ; Acropents leucocephalus, Koch ; 

 Alona affinis, Leydig ; Chydorus spha'ricus, Jurine ; Polyphemus 

 pcdiculus, de Ueer ; Diaptonius ininufus, Lilljeborg ; C y clops strenuus. 



