ILLUSTRATIONS. 



(All drawings on this plate are natural size.) 



Fig. 1. Aclesia freeri sp. nov. 



2. Tentacle of Aclesia freeri sp. nov. with large villi. 



3. Tentacle of Aclesia freeri sp. nov. 



4. Large villus of body fully extended. 

 Figs. 5 and 6. Villi. 



Fig. 7. Rhinophore, showing the posterior grooved surface. (Drawn by 

 Espinosa.) 



Plate II. 



Fig. 8. Branchial cavity opened by splitting and folding back the parapodia. 

 9. Posterior extremity of an expanded, creeping aclesia. (Drawn by 

 Espinosa.) 



Plate III. 



Fig. 10. Ventral view of head. 



11. Tentacle. 



12. Digestive organs of Aclesia freeri sp. nov. The liver is drawn as 



if it were a transparent substance through which the coils of the 

 intestine can be seen. The intestinal artery is seen entering the 

 liver above the right margin of the stomach. The hermaphrodite 

 gland lies back of the liver, surrounded by coils of the intestine. 



13. Pharynx, oesophagus, crop, gizzard, and stomach, opened by a dorsal 



incision. 



14. A portion of the wall of the stomach containing the hepatic pore, 



showing how the aperture is closed by the fleshy lateral pads and 

 the anterior chitinous plate. 



15. Lateral view of the pharynx. Only the anterior end of the pharynx 



is attached to the lips. The left salivary gland lies upon the 

 dorsal surface of the oesophagus; the right some distance below. 

 The buccal ganglia show behind the right salivary gland. 



16. Anterior view of the interior of the gizzard. 



17. Basal view of a large stomach plate. The axial column is clearly 



defined. X 2. 



18. Lateral view of the same plate. X 2. 



19. Lateral view of one of the small plates situated on the anterior 



margin of the gizzard. X 4. 



20. A small spine from the stomach, x 4.5. (Drawn by Espinosa.) 



87 



