191"] Esscnhcrg: Some Species of Aphroditidae 407 



the dorsal surface of the anterior portion of tlie prostomium. The 

 median tentacle is unusually long in this species. In this respect it 

 resembles Kinberg's (1855) Aphrodita longicornis, but differs from 

 it in the absence of the iridescent lateral fibers and in the shape and 

 the size of the body. 



The ventral lip extends to the third segment and is well marked 

 off laterally by deep grooves on each side. The facial tubercle reaches 

 ventrally to tlie mouth. 



There are fifteen pairs of elytra, arranged in the usual order 

 characteristic of the genus. The elytra (pi. 32, fig. IS) are large, 

 thin, and transparent, covering the entire dorsum. The branchiae 

 (pi. 32, fig. 23) are hatchet-shaped, having three or four main lobes, 

 which are more or less deeply indented. 



The parapodia (pi. 32, fig. 24) are biramous, supported by two 

 long, dark-brown aeiculi, piercing the tips of parapodia. The neuro- 

 podium is of median length, bearing the three rows of setae. The 

 dorsal series consists of two very stout, bluish-brown setae (pi. 32, 

 fig. 16 ) , arising one on each side of the aeiculum. They are perfectly 

 smooth, with slightly curved and attenuating, bluntly ending tips. 

 The second row is made up of three or more setae (pi. 32, fig. 20), 

 similar to the former, but differing from them in the smaller size 

 and the straighter, more bluntly-ending tips. The ventral series con- 

 sists of five or six setae (pi. 32, fig. 17) similar to the others in shape, 

 but smaller. The neurosetae of the second parapodium (pi. 32, fig. 

 19) are specially modified, bearing spinous projections with the distal 

 ends spirallj^ twisted. The posterior or caudal neurosetae (pi. 32, 

 fig. 26) are similar to the neurosetae of the second parapodium 

 except that they end more bluntly and that the large protuberances 

 are distributed more evenly on the entire surface of the distal portion. 



The notopodium is a broad, low protuberance. It bears two rows 

 of setae. Each row is made up of ten or eleven pale-brown setae, 

 which are completely covered by debris. The tips of the notosetae 

 are almost colorless, very fragile, fine, ending in an abrupt curve or 

 hook (pi. 32, fig. 25). The fibers of the ventral tuft are very coarse. 

 The}' are abundant, partly concealing the neuropodia, and are white 

 or colorless. Those of the dorsal tufts are long and form a very thick, 

 felty covering over the dorsum. 



The neurocirrus is about one-fifth of the length of the notocirrus 

 (pi. 32, figs. 21, 24). The notocirrus arises from a prominent cirrato- 

 phore and extends posteriorly and laterally, lying on the surface of 



