222 



UR. A, A. W. HUBRECHT, 

 FIG 8. FIG 9. 



Fig. 8. — Diagram of the genital and excretory system of Chcetoderma^ 

 seen from above. Reconstructed after the description and figures of 

 Hansen (6). O, genital gland; P, pericardium ; iV, Nephridia ; r, 

 rectum ; Br, branchite, situated with the openings of N and r in the 

 infundibulum. 



Pig. 9. — The same of Neomenia carinata. 0, P, N", r, and 3r, as in Fig. 8. 

 CI, cloacal cavity, into which r and iV open out. 



In this figure and in the foregoing the exact mode of communication 

 between and P could not be represented, this having not yet been 

 satisfactorily settled. 



FIG [0. 



FIG II. 



Fig. 10. — The same cf Proneomenia. Letters as in Fig. 9, 

 Fig. 11. — The same of Chiton. For the greater part copied from Sedg- 

 wick (19). Letters as in Fig. 9. ^, genital opening; m, exterior 

 opening of Nephridia. 



