EXPLANATION OF PLATE XXXIX. 



Physalidonotus rugosus, sp. nov. 



Figs. 23-24. — A iieuropodial chseta from two aspect-s ( x 90). 



Fig. 25. — Two parapodia seen from above ( x 5), .showing 

 the di.spo.sition of the branchial papulse, the shape 

 of the elytrophore, the large dorsal swelling on the 

 cirriferous foot, and the gland at the base of the 

 dorsal cirrus. 



Phymlidunolus laevis^ sp. nov. 

 Fig. 2(i. — The prostomium from the side (x 10). 

 Fig. 27. — The prostomium from above (x 10), the posterior 



border is overhung by the first dorsal pad. 

 Fig. 28. — An elytron (x 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 ( X 45), showing the 



soft conical tubercles near the margin. 

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



(X 45). 

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



of the papulse. 



Physalidonotus turritus, sp. nov. 

 Fig. 33.— An elytron (x 20). 

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



dorsal pad. 

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



the papulae. 



Physalidonotus paucibranchiatus, sp. nov. 



Fig. 16.— A neuropodial chseta (x 90), showing the con- 

 striction below the bearded region, characteristic 

 of this species. 



Fig. 37. — Two parapodia (X 10), showing the papulse. 



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

 This serves to illustrate the form characteristic for 

 the genus. 



