198 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE X. 



Fig. 63. Seta-tips of Peisidice aspera from a middle parapod; a the low- 

 est, b average, cthe highest of ventral series; d, tip of dorsal seta; X 228. 



Fig. 64. Posterior aspect of twenty-sixth foot of Sthenela'is fusca. In 

 glycerine; X 19.5. 



Fig. 64a. Tip of slender, articulated seta from ventral series of a middle 

 parapod of the preceding. Lowest in the series. Glycerine preparation; 

 X 228. 



Fig. 646. One of the medium, stout, jointed seta; of ventral ramus of the 

 same. Glycerine; X 228. 



Fig. 64c, d. Tips of two of the strongest and uppermost of the ventral 

 fascicle of the same. They are adjacent and the one to the left is the lower; 

 X 228. 



Fig. 64^. Tip of one of the fascicle of frilled setae from the ventral ra- 

 mus of the same; X 228. 



Fig. 6471 Basal portion of one of the long, slender, serrated, dorsal setae 

 of the preceding; profile view. In glycerine; X 228. 



Fig. 64^-. Frontal view of a small portion of one of the dorsal setae; X 228. 



Fig. 65. Posterior aspect of fifteenth parapod of Sthenela'is verruculosa. 

 In glycerine; X 19.5. 



Fig. 65a. Tip of one of the slender, articulated, ventral setae of the fore- 

 going; from the lowest part of the fascicle; X 228. 



Fig. 655. Tip of one of the stouter, articulated setae of ventral fascicle of 

 the same; X 228. 



Fig. 65c. Tip of one of the fascicle of simple, frilled setae; X 228. 



Fig. 65^. Profile view of a portion of one of the long, curved, dorsal 

 setae. In glycerine; X 228. 



