chamberlin: pacific coast polychaeta. 26 1^ 



in height caudad; replaced in abdominal region by a small conical process. 

 Thoracic neuro{)odials in three subvertical series in addition to a ventrocaudal 

 fascicle of longer, capillary cross-striate setae. The coarser setae of the 

 posterior series are continuously narrowed distad with apex narrowly rounded; 

 each abruptly, strongly bent, nearly geniculate, with terminal region long; 

 without serration or cross-ridging on the convex side, but some weak cross 

 wrinkles indicated on the angle on the concave side. Setae of the other two 

 series proximally stout, narrowing abruptly into the usual long, slender, distal 

 region, this with a double curve, strongly finely cross-ridged on the concave 

 side of proximal curve and some distance proximad of this on stouter part of 

 seta. Twenty-six segments in anterior region. Total number of segments 

 in type near two hundred and thirty-seven. 



Length of type about 50 mm.; greatest width, 3 mm. 

 Locality. — Cahf. : Mendocino (A. Agassiz). 

 Type.— M. C. Z. 2,136. Paratype.—M. C. Z. 111. 



Sabellariidae. 

 23. Sabellaria californica Fewkes. 



Bull. Essex inst., 1889, 21, p. 130, pi. 7, fig. 3, 4. 

 Mendocino (A. Agassiz). 



24. Sabellaria nanella, sp. nov. 



Plate 2, fig. 5-7. 



This is a very small species readily distinguishable by the forms of the 

 opercular paleoli. The paleoli of the outer series have long, slender, closely 

 contiguous stems, normallj^ mostly concealed, the free part expanding into 

 broad, colorless, or weakl}^ golden shining blades which narrow a little distad; 

 the distal end finely pectinate with a process or spine toward ventral end of 

 series much longer and stouter than the other. On each side they number 

 twenty-nine or thirty and form a close semicircle spreading out horizontally, 

 i. e., at right angles to long axis of body. The paleoli of the inner series are 

 also arranged in a semicircle with convexity ectad. They are plate-like and 

 contiguous at base but narrow strongly and acutely distad, the tips sUghtly 

 bent ventrad so that the end appears narrowly truncate. Each blade con- 

 tinues just above base on ectal side into a rounded, short, and broad, process 

 or spur. They number about twenty on each side. The paleoU of the middle 



