ANNELIDS OF FAMILY NEREID AE HARTMAN 471 



Remarks. — Nereis 'pseudoTieanthes differs from N. vexillosa Grube 

 and N. mediator Chamberlin in its dentition. Each of the nine spec- 

 imens in the collection has area V of the proboscis beset with 

 numerous chitinous platelets. 



NEREIS (NEREIS) NEONIGRIPES, new species 

 FiGUEE 48 



Description. — Prostomium (fig. 48, a) with an anterior portion 

 about as long as wide; basal portion, in region of eyes, almost twice 

 as wide; its length subequal to its width; prostomial antennae 

 longer than width of anterior end of prostomium, their bases sepa- 

 rated by a distance equal to their diameter (fig. 48, a). 



Palpi stout, thickened dorsoventrally ; extending distally to beyond 

 tips of antennae; palpostyles spherical (fig. 48, a). 



Paragnaths dark brown ; area I with two teeth in tandem ; II with 

 about 10 blunt cones, smaller than those of III; III with 10 to 12 

 blunt cones forming an oval transverse patch ; IV with a crescent of 

 many, mostly larger, teeth, with a few smaller cones at the periph- 

 ery of the patch; V with none; VI with four (rarely three) high 

 cones; VI-VIII with a continuous band of three irregular rows of 

 many teeth and a row of larger cones on the maxillary side. 



Jaws deep horny brown, thickened distally, with four shallow 

 oblique teeth and one crenulation more proximad. 



Parapodia (fig. 48, &, c) with lobes thickened, bluntly rounded, the 

 first 15 giving impression of terminating in dark spheres, on account 

 of dark pigmentation; all lobes equal or subequal as far as mid 

 region of body, after which dorsal lobes progressively though gradu- 

 ally increasing in relative size, becoming about twice as wide as 

 ventral lobes in posterior fifth of body. 



Ventral cirri extending laterally to ends of ventral lobes through- 

 out; originating slightly ectad of crotch where foot joins body (fig. 

 48, c). 



Dorsal cirri (fig. 48, 5, c) more than twice as long as dorsal lobes, 

 attached to dorsal lobe on dorsal side, in line with axis formed by 

 middle lobe and dorsal lobe. Falcigerous setae as in figures 48, d, e. 



Abnormality. — A single specimen less than half as large, but with 

 similar proportions and color markings, has a single enlarged pro- 

 stomial antenna (fig. 48, /) in place of the usual paired antennae. 

 Its parapodia (fig. 48, g) and setae compare well with those of a 

 normal specimen of N. neonigripes. 



Holotype.— U.S. ^.M. no. 20201. 



Distribution. — Kodiak, Alaska ; Sonoma County, Calif. ; Pacific 

 Grove, Calif. 



Remarks. — This species lies between N . procera Ehlers and N. 

 natans, new species. It differs from both of these most conspicuously 



