404 University of California Publications in Zoology [Vol. 1(5 



mens belonged to the species castanea, as he so classified these 

 specimens (1914). Closer observation and comparison of the speci- 

 mens with Aphrodita castanea, which Dr. Moore had kindly sent to 

 us, as also with the numerous examples of A. castanea in the collec- 

 tions of the University, showed some essential characteristics dis- 

 tinguishing these specimens from Aphrodita castanea. We have 

 therefore assigned them to a new species, A. longipalpa, distinguished 

 from A. castanea as follows: (1) the shape of the body of Aphrodita 

 longipalpa is narrower than that of A. castanea; (2) the dorsum is 

 more convex; (3) the notosetae, although arranged in the same man- 

 ner as those of A. castanea, lack the golden-brown, lustrous appearance 

 of the latter, and are rather dull and inconspicuous ; (4) the parapodia 

 are relatively longer than in A. castanea; (5) the neurosetae are very 

 long, of a dark-brown, almost black, color; (6) the palpi are the 

 longest known in any species of the genus; (7) the shape of the 

 prostomium differs also from that of A. castanea; (8) the ocular 

 hemispheres are less prominent, without any trace of pigmented eye- 

 spots, while in A. castanea the two pairs of ej^e-spots show very 

 distinctly; and (9) the fimbriated organs in A. longipalpa are less 

 deeply lobed, and the lobes are less numerous, than they are in 

 castanea, being obtusely rounded instead of long, narrow, and pointed. 



Description. — The body (pi. 37, figs. 77, 78) is narrow and the 

 dorsum is convex. The length of bodj' in the two specimens is 26 

 and 34 mm. respectively, and the greatest width is 19 and 22 mm. 

 respectively, measured from tip to tip of the setae. The width of 

 body between the parapodia is 6 and 8 mm. respectively. The number 

 of segments is 33. 



The width of the prostomium (pi. 31, fig. 1) is slightly greater 

 than its length. The two ocular prominences are hemispherical, 

 slightly depressed from above. No eye-spots are visible on either of 

 the specimens. The palpi are 11.5 times the length of the prostomium, 

 having a definite short basal part. They are stout at the base, taper- 

 ing very gradually toward the distal end, covered with very fine 

 sensory papillae, which are visible only under high magnification. 

 The median tentacle consists of a short cirratophore and a style of 

 equal length. It is so far ventrad that it is invisible when viewed 

 from the dorsal surface. The facial tubercle is large, compressed 

 between the palpi. It ends in a long, finger-like projection extending 

 ventrally over the mouth, and is covered with prominent papillae. 

 The mouth is ventral. The ventral lip is definitely marked off by 



