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distinguished from the other genera of the Chiridotinae. In "The 

 Apod. Holoth." Clark refers 13 species to it, and since that time 

 five new species of Chiridota have been described. In the collection 

 at hand there are 1 1 different species, two of which, nanaimensis 

 and pacifica, are new to science. The specimens from Hawaii are 

 without any doubt the same species as Fisher's hawaiiensis, and 

 as they differ in several characters from rigida Semper, I cannot 

 follow Clark in regarding these two species as synonyms. As to 

 the other species, liberata Sluiter and amboinensis Ludwig, which 

 Clark refers to rigida, I am convinced that they also are specific- 

 ally different from it. Both the two. species are poorly described 

 and the description of liberata is furthermore obviously erroneous. 

 Howewer, for the present I think it the better course to regard 

 them as independent species. Thus at present we must distinguish 

 between the following 23 species of Chiridota: 



1780. lœvis Fabricius. 



1829. discolor Eschscholtz. 



1849. violacea Johs. Müller. 



1851. rotifera Pourtalés. 



1868. rigida Semper. 



1880. eximia Haacke. 



1886. pisanii Ludwig. 



1888. liberata Sluiter. 



„ amboinensis Ludwig. 



1896. stuhlmanni Lampert. 



1898. fernandensis Ludwig. 



1899. intermedia Bedford. 



1904. marenzelleri Perrier. 



1907. hawaiiensis Fisher. 

 „ uniserialis Fisher. 



„ albatrossii Edwards. 



gigas Dendy & Hindle. 



1908. regalis Clark. 

 1920. aponocrita Clark. 

 1925. nigra Mortensen. 



„ carnleyensis Mortensen. 



1928. pacifica n. sp. 



„ nanaimensis n. sp. 



Of these species 14 are represented in the collections of the 

 zoological museum of Copenhagen, and from the study of them it 

 appears that many of the characters hitherto used for separating 

 the species e. g. the arrangement of the wheel-papillae and the 

 number of digits and polian vesicles may vary highly within the 

 single species, for which reason these characters cannot be relied 

 upon. By far the best characters for separating the species seems 

 to be the shape of the ciliated funnels, the shape and arrangement 

 of the miliary granules and the shape of the pieces of the calcareous 



