1917] Esseiibcrg: Some Species of Aphroditidae 415 



respective length of the three specimens at hand is 12, 15, and 28 mm. 

 The respective width, from tip to tip of the setae, is 8, 12 and 15 mm. ; 

 between the parapodia, 5, S, and 9 mm. respectively. 



The prostomium (pi. 36, fig. 64) is subglobate, slightly wider than 

 long. The ocular hemispheres are prominent, each bearing a pair 

 of median-sized eyespots located on the dorsal and the antero-ventral 

 surface of the hemispheres. The median tentacle consists of a short 

 eirrophore, bearing a style almost equal in length to the cirriphore, 

 ending in a bulbous tip. The white, stout palpi are almost uniform 

 in width, tapering verj^ slightl}^ towards the distal ends, and are 

 covered with sensory cilia. Their length is four times that of the 

 prostomium. 



The fifteen pairs of round, transparent elytra (pi. 36, fig. 66) are 

 arranged in the usual order. The fimbriated organs (pi. 36, fig. 67) 

 begin at the sixth segment, occurring thence on all cirriferous seg- 

 ments. They consist of six to eight prominent lobes. Each is sub- 

 divided into two or more smaller lobes, although undivided lobes 

 occur. 



The parapodia (pi. 36, fig. 73) are of median size, biramous, and 

 are supported by two strong, dark-brown aciculi. The neuropodial 

 setae from the three series (pi. 36, figs. 74, 75, and 76) are very 

 much alike except for the difference in size. They are smooth, with 

 slightly bent tips ending bluntly. The tips of the setae of the middle 

 series are less curved than those of the otlier two series. The neuro- 

 setae of the second parapodium (pi. 36, fig. 71) are covered witli 

 prominent spines, except the extreme distal tip, which is smootli, and 

 terminates in a pointed end. The caudal neurosetae (pi. 36, fig. 65) 

 bear prominent spinous projections which are evenly distributed on 

 the distal portion of the setae, except on the extreme distal end, which 

 is smooth. 



The notopodium is an inconspicuous tuberosity bearing two rows 

 of dark brown setae and the lateral and tlie dorsal fibers. The dorsal 

 setae (pi. 36, fig. 72) are almost straight, ending bluntly, and are 

 covered with asperities. The latter are less conspicuous near the 

 distal end, increasing in size toward the proximal end. 



The neurocirrus arises from a strong eirrophore and is about 

 one-sixth of the length of the notocirrus. 



The body of the worm is covered with papillae, of which the dorsal 

 papillae are less prominent, and with papillae of the simple type 

 without the caps (pi. 36, figs. 68, 69, 70). 



