PLATE D. 



1. Floscularia campanulata 



2. Floscularia Cyclops 



3. Acyclus inquietus . 

 3a. 



36. . 



4. Apsilus lentiformis . 

 4a. 



46. 



4C. ,, ,, . 



5. Apsilus bipera 



Melicerta conifera . 

 



Limnias ceratophylli 

 (Ecistes velatus 



6. 



6a. 



7. 



8. 



8a. 



86. 



8c. 



Bd. 



8e. 



9. Megalotrocha alboflavicans 

 ya. ,, ,, . 



10. Conochilus volvox . 



11. Trochosphaera sequatorialis 



. H 

 Rafter Prof. Leidy. 



after El. Metsch- 

 nikoff 



with everted tube (after Dr. Moxon) 



ventral view 



side view 



head, ventral view .... 



head, closed, side view .... 



dorsal view ...... 



ventral view, contracted 



nervous ganglion, lateral canals, and 



vibratile tags 



trophi ....... 



young female, dorsal view 



male, dorsal view ..... 



hind extremity of male . . . . / 



ventral view \ 



head, dorsal view, showing ciliary \ after Miss Foulke 



wreath . . . . . . I 



male coming out of tube 



male, side view ..... 



male 



side view ; corona expanded . 

 side view ; corona contracted 

 corona, side view, showing thickenings . 



foot and sucker 



cloaca, and surrounding parts 

 mastax, front view .... 

 mastax, side view ..... 

 young female ..... 



young male (?) 



male, dorsal view (after Dr. Colin) 

 female, side view (after Prof. C. Semper) 



