46 



About the relation with Chaetoderma nothing can as yet be determined, which might 

 be expected from all I have told of its radula. The relation with Myzomenia of which Thiele 

 makes mention, can no more be demonstrated for Chaetoderma, on account of its very com- 

 plicated radula. 



In the preceding pages I have tried to explain the different relations of the Xeomeniidae ; 

 for phylogeny my scheme is of no value of course. Perfect certainty can be obtained only 

 after repeated and close investigations of the known forms and of new ones which will probably 

 be discovered. In this respect the rich collection, brought back by the Siboga-Expedition, may 

 be considered an important extension of our knowledge of the Solenogastres. 



LITERATURE REFERRED TO '). 



1. A. A. W. HUBRECHT. Proneomenia Sluiteri, gen. nov. and spec. nov. Nied. Arch. f. Zool. 1881, 



Suppl. 1—75. 



2. A. KOWALEVSKY and Marion. Contributions a I'histoire des Solenogastres on Aplacophores. Ann. du 



Mus. d'Hist. Nat. de Marseille. Zoologie Tom. Ill, 18S7. 



3. A. A. W. HUBRECHT. Dondersia festiva, nov. gen. nov. spec. Donders-feestbundel. 1888. 



4. G. PkuVOT. Sur I'organisation de quelques Neomeniens des cotes de France. Arch, de Zool. Exp. 



Serie II, Tome IX, 1891. 



5. G. Hkuscher. Zur Anatomic und Histologic dcr Proneomenia Sluiteri. Jen. Zeitschr. fiir Naturw. 



Bd. XXVn, N. F. XX, 1892. 

 6a. A. WiREN. Studien liber die Solenogastres. I Kongl. Svenska Vet. Ak. Handl., Band XXIV, n". 12, 1891. 

 eb. II Bd. XXV, n". 6, 1892. 



7. H. SlMROTH. Mollusca in Bronn's Klassen und Ordnungen des Thierreichs. Leipzig, 1893. 



8. J. TlllELE. Beitrage zur vergl. Anatomic der Amphineura. Z. f. uiss. Zool. Bd. LVIII, 1894. 



9. — — Zwei Australische Solenogastren. Zool. Anz. Bd. XX, 1897. 



10. G. Pruv'OT. Sur deux Neomeniens nouveaux de la Meditcrranee. Arch, de Zool. Exp. Serie III, 



Tome VII, 1899. 



11. J. Thiele. Proneomenia thulensis in Fauna arctica Romer und Schaudinn. Bd. I, 1900. 



12. P. Pelsexeer. Les Neomeniens de I'Expedition antarctique beige et la distribution geographique des 



Aplacophora. Bull, de I'Acad. roy. de Belgique, n". 9 — 10, pag. 528 — 534, 1901. 



13. A. KowALEV-SKV. Sur le genre Chaetoderma. Arch, de Zool. Exp. et Gen. y^^ Serie, Tome IX, 1901. 



l) For completeness' sake I may here yet mention the other publications concerning Solenogastres, which I have had no 

 occasion to refer to in the text. 



S. LovfeN. Chaetoderma, ett nytt maskslagte. Oefvers. K. Vet. .\k. Fbrhandlgr. Stockholm 1844. 



T. TULLBERG. Neomenia, a new genus of Invertebrate Animals. Bih. till. K. Svensk. Vet. .\kad. Handl. Bd. Ill, n" 13, 1875. 



L. Grafk. Anatomic des Chaetoderma nitidulum Lov. Zeitschr. f. vviss. Zool. Bd. XXVI, 1876. 



Neomenia, Proneomenia und Chaetoderma. Zeitschr. f. wiss. Zool. Bd. XXVIII, 1877. 



G. Akmaler Hansen, .\natomisk licskrivelse af Chaetoderma nitidulum. Nyt. Mag. f. Naturvid. Bd. XXI 1, 1877. 



KOREN and Danielssen. Descriptions of new species belonging to the genus Solenopus, with some observations on their organisation. 



Ann. Mag. Nat. Hist. 5 Serie III, 1879. 

 .\. Kowalevsky et A. F. Marion. Etudes sur les Neomenia. Zool. .\nz. Bd. V, 1882. 

 E. Selenka. Gephyrea. Challenger-Report. Zoology XIII, 1885. 



G. .\rmaI!ER Hansen. Neomenia, I'roneomenia und Chaetoderma. Bergens Museums .Varsberetning. 1888. 

 G. Prlvot. Sur le dcveloppement dun Solenogastre. Compt. rend. CXI, 1890. 



