NO. 3 HARTMAN : POLYCHAETOUS ANNELIDS 237 



Nephthys dibranchis Grube 



Nephthys dibranchis Grube, 1878, p. 536; Mcintosh, 1885, pp. 161-162, 

 pi. 26, figs. 8, 9, pi. 27, fig. 5 ; Augener, 1923, pp. 15-16; Fauvel, 

 1932, pp. 117-118; Monro, 1933, pp. 56-57, fig. 24; Hartman, 

 1938, p. 146. 

 Nephthys mirasetis Hoagland, 1920, p. 610, pi. 48, figs. 5-8. 



Collections.— \^5-3A, 187-34, 213-34, 250-34, 421-36, 436-36, 492- 

 36, 513-36, 661-31 , 668-37, 770-38. Numerous specimens. 



The prostomium has 2, more or less clearly distinguishable, minute, 

 black eye spots on its posterior half. The proboscis has 22 rows of papillae 

 and is finely punctate proximally. 



Recurved cirri are involute, present from the fourth or fifth setige- 

 rous segment. The lyre setae are much finer than either the barred pre- 

 acicular or the serrulated postacicular setae. 



Distribution. — Eastern and western southern Pacific; Galapagos Is- 

 lands; Panama (Pacific); western Mexico; Gulf of California. Inter- 

 tidal, to 60 fms. 



Nephthys squamosa Ehlers 

 Plate 41, Figs. 98-99 



Nephthys squamosa Ehlers, 1887, pp. 128-131, pi. 37, figs. 7-10; Augen- 

 er, 1918, pp. 159-160, pi. 3, fig. 67; Monro, 1933, pp. 52-53. 



Collections.— 5A6-36, 632-37, 669-37, 735-37, 856-38, 900-38. 10 

 specimens. 



The proboscis has 22 rows of terminal papillae; it is smooth proxi- 

 mally. Recurved cirri, present from the fourth setigerous segment, are 

 long, curving outward, though perhaps small or absent from at least some 

 posteriormost segments. The prostomium is subtrapezoidal, broadly 

 rounded anteriorly and somewhat longer than wide, hence differing from 

 that described by Ehlers (1887, pi. 37, fig. 7). 



The dorsal lamellae are broad, foliaceous, lying flat over the dorsum, 

 recalling the elytra of a polynoid. Both dorsal and ventral postsetal la- 

 mellae are elongate, foliaceous. The dorsal cirrus, also, is longer than 

 typical of this species. Neuropodia have a slender, digitate lobe at their 

 dorsal edge (pi. 41, fig. 98) not shown by Ehlers (1887, pi. 37, fig. 8), 

 but believed to be referred to in the text (1887, p. 130), "auf seiner [un- 

 tere Ast] vorderen Flache steht am oberen Rande eine kleine schmale und 

 diinne Lippe, welche nicht weiter als die Spitze hinausragt." 



Postacicular setae are lanceolate, with cutting edge minutely serrated. 

 Barred setae are slenderer than the lanceolate setae. Lyre setae are absent. 



