o84 EDWAIM) S. MORSE ON 



PLAT?: or,. 



Nephriilia of variiius forms. 

 Fig. 1. Wight, iicpliridiuJii of L. iimitina. 



Fig. 2. Gri-aliy ciiliirKi'il vii'W of jR'plirosUjine from below, showing lacuniu", idem. 

 Fig. 3. Left iiei)hriilium of I). lanicUosa. 



F'igs. 4 and 5. Anterior coeloniii: wall showing terminal portion of ne|iliiidial lubes and Iheir external openings, iiiein. 

 Fig. 4. From outside. 

 Fig. 5. From inside. 



Fig. 6. Nephridia from very young D. lainellosa. 

 Fig. 7. Nephridia in silii of T. coreanka. 



Fig. 8. Dorsal section of T. coreanica, showing po.sition of nei)hridia in relation to other parts and their slit-like openings 

 outside. 



Fi.g. 9. Nephridium of T. coreanica. 



Figs. 10 and 11. Nephridia of //. jisiUarca, showing genital band with accessory vesicle, etc. 



Fig. 10((. Enlarged view of border of nephroslome, idem. 



Fig. llo. A sinus from body of nephridium greatly enlarged, idem. 



I'LATE W. 



Nephridia of Terebratuliiia septentriiimdia and Dallimi. rjrayii. 

 Fig. 1 to 7. TerebratuUna septentrionalis. 



Fig. 1. Left nephridium. 



Fig. 2. Kight nephridium with divaricator muscles, segment of intestine, ilio-parietal band, etc. 



Fig. 2a. Nephrostome papillae. 



Figs. 2/> and 'Ic. Appearance of surface of nephridium. 



Fig. 3. Nephridium, with genital band, accessory vesicle, etc. 



Fig. 4. Pedimcular end of young specimen showing nephridia. 



Fig. 5. Very young sijecimen showing nephridia. 



Fig. 5a. Nephridium greatly enlarged. 



Fig. 6. External opening of nephridium, front view. 



Fig. 7. Side view of nephridial opening showing nipple-like fornr 



Fig. 8. Nephridia of Dallimi grayii. 



Fig. 9. Nephridium of last, showing more clearly the crenulateil character of nephrostome. 



PLATE f)7. 



Genital products, etc., of various forms. 

 Fig. 1. Ovaries and .stomachal glands of Glottidia. 

 I'ig. 1(1. Portion of stomachal glands. 

 Fig. 16. Portion of ovaries. 

 Fig. 2. Mass of spermaries of Glottidia. 

 Fig. 3. Mass of spermaries of L, iimdina. 

 Fig. 4. Mass of eggs of L. lepidula. 

 Fig. 5. Mass of eggs of Glottidia. 

 Fig. 5o and 56. Eggs in various stages. 

 Fig. 6. Eggs of Discinisca stella. 



