338 DE. H. J. HANSEN ON THE 



Plankton-Expedition," 1895, I attempted tentatively to procure 

 equivalence between the families of the order Isopoda ; the family 

 Cymothoidse sens. lat. was established as equivalent with Spbsero- 

 midse, Bopyridse, or Epicaridse, &c. ; the six families Cirolanidse, 

 Corallanidse, Alcironidae, Barybrotidse, ^gidse, and Cymothoidse, 

 accepted or established by me iu 1890 in the above-named 

 paper, were now considered as subfamilies {Cirolanince, &c.) of 

 he family Cymothoidse. This explains the use of the name 

 Cirolanincd in the title of the present treatise. In 1903 

 A. Dollfus published " JS'ote preliminaire sur les especes du 

 genre Cirolana . . . . de I'Hirondelle et de la Princesse-Alice " 

 (Bull. Soc. Zool. Prance, vol. xxviii. pp. 5-10) ; the author 

 describes a new deep-sea species from the Mediterranean, and 

 enumerates numerous new localities for some other species. 



In 1902 my friend, the Eev. Canon A. M. Norman, urged 

 me to work out some Oirolanince preserved in his splendid 

 collection of European marine Invertebrates, among which was 

 Murydice polydendrica, Norm. & Stebb., published as a nomen 

 nudum many years ago : I promised to do so. In 1890, M. A. 

 Dollfus sent me a considerable number of Erench Cirolanince, 

 among which I found one new species of Eurydice. Then I 

 resolved to write a revision of the European marine species. In 

 order to get more material, I applied to Professor Yves Delage, 

 who kindly forwarded a vast number of Conilera cylindracea and 

 of a species of Cirolana which, to my great astonishment, proved 

 to be a new form. I beg these three gentlemen to accept my 

 sincere thanks. Einally, I inserted the material received by the 

 Copenhagen Museum since 1890 from various sources. 



As stated in the title, the aim of the present treatise is to give 

 a revision of the European marine forms of the subfamily, while 

 the freshwater forms found in Prance are omitted from want of 

 material. Before 1890 six valid species had been described, (the 

 rather doubtful Eurydice fontica, Czern., not included) j in 1890 

 I added three species, and since that year three valid species 

 have been found or described. The total was thus 12 species. 

 In the present paper I add three more species ; so that the total 

 is now 15 species, belonging to the three genera Cirolana, Coni- 

 lera, and Eurydice, all established by Leach. Of Eurydice only 

 two species, viz. E. pulclira, Leach, and the female of E. trun- 

 cata, Norm., were known before 1890; I am now able to 

 enumerate six European species. But these species, though 



