SOLENOGASTRES. 11 



y. With rthilominal, witbont cloacal spicules. Salivary glands tubc-sbaped. 

 Index C-io. 



Proneonienia gorgonophila Kow. a. Mar. (5, p. 75.) 



Mediterranean. 

 Proneomenia desiderata Kow. a. Mar. (5, p. 59.) 

 Mediterranean. 



B. Radula biserial. Salivary glands tube-shaped and opening out separately. With 



abdominal .spicules. Receptacula seininis numerous. One dorso-tcrminal sense-organ. 

 Index 18. 



Epimenia Nierstrasz. 

 . Epimenia austraUs (Thiele) (17, p. 255.) 



N.W. coast of Australia. GO fathoms. 



C. Radula bi-pectinid. Salivary glands consisting of more or less developed accumu- 



lations of glandular cells, opening out through salivary ducts, whicli remain separated. 

 .Abdominal spicules present. Receptacula seminis numerous. The coelomoducts remain 

 .separated. Index 24. 



Anamenia Nierstrasz. 



Anamenia amhoinensis (Thiele) (15.) 

 Ambon. 



D. Radula bi-pectinid (?). SaUvary glands lobed, consisting of accumulations of 



glandular cells, and opening out through salivary ducts, which remain separated. 

 Without abdominal and cloacal spicules. Index 20. 



Ampliimcnia Thiele. 



Amphimenia neapnlifana Thiele (13, p. 244.) 

 Naples. 



The same holds good for Bhopalomenia. Up to now, of this genus five species 

 are known, viz., aglaopheniae Kow. a. Mar. ; eisigi Thiele ; indica Nierstr. ; dehilis 

 Nierstr. ; and sca)idens Heath. All these forms resemble the Proneomeniidae ; they 

 differ, however, in the absence of a radula. Traces of the latter are found in 

 the radula-sac. The structure of the salivary glands presents important points of 

 difference. R. aglaopheniae has two pairs of salivary glands, one pair vesicular and 

 the other lobate, just as they occur in Amp>himenia. Undoubtedly, R. eisigi is related 

 to aglaopheniae. R. indica shows numerous receptacula seminis ; cloacal spicules, 

 however, fail. True abdominal spicules are absent, though around the cloacal opening 

 .spicules occur of special form. Moreover, there only occur two tube-shaped salivary 

 glands"; relation with Proneomenia thtdensis and Epimenia au.^tralis should, therefore, 

 not 1)0 excluded. Rhopalomenia dehilis, thoroughly known to us, prol)alily is closely 

 related' to Rhopalomenia indica. (_)ur knowledge of the structure of the internal 

 organs of Rhopalomenia scandens, with the exception of the nervous system, is 

 insufficient. It appears to me that these forms are connected with different genera 

 of the Proneomeniidae, and, therefore, the genus Rhopalomenia may be a hetero- 

 geneous one. A division into smaller genera is for the present not to be recom- 

 mended'; in still stronger degree the same holds good for Chaetoderma (7, p. 368). 



c 2 



