SOLENOGASTEES. 11 



y. "With abdominal, without cloacal spicules. Salivary glands tube-shaped. * 

 Index 6-25. 



Proneomenia gorgonopJiila Kow. a. Mar. (5, p. 75.) 



Mediterranean. 

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

 Mediterranean. 



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



abdominal spicules. Eeceptacula seminis numerous. One dorso-terminal sense-organ. 

 Index 18. 



Epimenia Merstrasz. 



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

 N.W. coast of Australia. 60 fathoms. 



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



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

 Abdominal spicules present. Eeceptacula seminis numerous. The coelomoducts remain 

 separated. Index 24. 



Anamenia Nierstrasz. 



Anamenia amioinensis (Thiele) (15.) 

 Ambon. 



D. Eadula bi-pectinid (?). Salivary glands lobed, consisting of accumulations of 



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

 Without abdominal and cloacal spicules. Index 20. 



Amphimenia Thiele. 



Amphimenia neapolitana 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. ; debilis 

 Nierstr. ; and scandens 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 Amphimenia. 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 thulensis and Epimenia australis should, therefore, 

 not be excluded. Rhopalomenia debilis, thoroughly known to us, probably is closely 

 related to Rhopalomenia indica. Our 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 



