EXPLANATION OF PLATE XXXIX. 



Physalidonotus rugosus, sp. nov. 



Figs. 23-24. A neuropodial cha3ta from two aspects (>; 90). 



Fig. -5. Two parapodia, seen from above (> 5), showing 

 the disposition of the branchial papulae, the shape 

 of the elytrophore, the large dorsal swelling on the 

 rirriferous foot, and the gland at the base of the 

 dorsal cirru>. 



Physalidonotus laevis, ,sp. nov. 



Fig. 2C>. The prostomium from the side (/ 10). 

 Fig. '21. The prostoniinm from above (> 10), the posterior 

 border is overhung by the first dorsal pad. 



Fig. -8. An elytron ( > 4). The lower margin of the figure 



is anterior. 



Fig. 29. A portion of its external area (x 45). 

 Fig. 30. A portion of its anterior area (> 45), showing the 



soft conical tubercles near the margin. 



Fig. 31. A couple of tubercles from the supra-areolar area 



( 45). 

 Fig. 32. Two parapodia ( 5), showing the arrangement 



of the papulae. 



Physalidonotus liirriltix, ^p. nov. 

 Fig. 33. An elytron (> 20). 



Fig. 34. The prostomium (/ 10), overhung by the first 

 dorsal pad. 



Fig. 35. Two parapodia from above (enlarged), showing 

 the papula. 1 . 



Physalidonotus paucibranchiatus, ,sp. nov. 



Fig. 10. A neuropodial chseta ( ,- 90), showing the con- 

 striction below the bearded region, characteristic 

 of this species. 



Fig. 37. Two parapodia ('/ 10), showing the papulse. 



Fig. 38. A parapodium ( 20), from its posterior face. 

 This serves to illustrate the form characteristic for 

 the genus. 



