1917] Esscnherg: Some Species of Aphroditidae 411 



setae from the ventral series (pi. 34, fig. 41) lighter iu color and finer 

 than either of the former, with a slight subterminal enlargement. 

 The notosetae pierce the felty covering. They are long and fine, and 

 are arranged in two rows. The tips are strongly hooked, forming 

 almost a ring (pi. 34, fig. 44). The lateral and the dorsal fibers also 

 have hooked tips. The neurosetae of the second parapodium (pi. 34, 

 figs., 45 and 46) have spinous protuberances and end in a fine point. 

 The caudal neurosetae (pi. 34, fig. 50) are long, ending bluntly. They 

 are covered with spiny hooks. 



The notocirri occur on all non-elytroferous segments. They are 

 four times the length of the neurocirri, terminating bluntlj'. 



Occurrence. — One of the specimens, the type, was taken on June 

 14, 1901, at Station XIX, Haul 1, at 33° 34^6 N, 117° 55:6 W, off 

 Newport, California, in a haul of the trawl at a depth of from 185 to 

 55 metres, on a bottom of soft mud, sand, and pebbles. The other one, 

 the paratj'pe, has no data. 



5. Aphrodita brevitentaculata 



PI. 35, figs. 51-63; pi. 37, fig. Hi 



Comparisons. — A single specimen, the type, is in the collection 

 of the Zoological Museum of the University of California. It was 

 previously identified bj' Treadwell (1914) as Aphrodita negligens. 

 Comparing the specimen with a cotype of A. negligens which Dr. 

 J. P. Moore kiudlj' sent to us, some essential differences were dis- 

 covered. 



The size of the body differs considerably. Of the two specimens 

 from Dr. Moore, one, the type, is 40 mm. long and 17 mm. wide, 

 excluding the setae ; the other one is 60 mm. long and 40 mm. wide. 

 Aphrodita brevitentaculata is only about one-third of that size, its 

 length being 23 mm. and its width 9 mm. Further differences are 

 found in the shape of the body, which is more obtusely rounded an- 

 teriorh' in A. hrevitentacidata, with the dorsum less arched. The 

 prostomium differs in shape in the two species. The eyes are very 

 small in A. negligens, but are unusually large in A. brevitentaculata. 

 The palpi are relatively shorter in A. brevitentaculata, being two and 

 a half times the length of the prostomium, while those of A. negligens 

 are four and a half times the length of the prostomium. The lateral 

 and the felt fibers of A. negligens are iridescent, of a dull green or 

 bluish color; those of A. brevitentaculata are colorless. In A. negligens 



