350 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



a heavy plume arises from a deep cleft between them (pi. 37, fig. 87). 

 In lateral view the plume is seen to be directed nearly at right angles to 

 the plane of the shaft (pi. 37, fig. 86). Middle opercular paleae (pi. 37, 

 fig. 88) are also roughened on their outer surface; they are heavy, dark 

 brown, with thick outer edge making up the outer part of the cone. 

 Inner paleae, completely covered by the middle ones, are very much 

 smaller, pale, the distal end thin and frayed out (pi. 37, fig. 89). 



P. calif ornica constructs sandy reefs in intertidal zones along many 

 parts of southern and central California; it is often associated with a 

 reef-building vermetid mollusk, Aides squamigerus Carpenter. When 

 removed from their tubes, they are unable to reconstruct them, but are 

 capable of repairing damaged ones. Typically, a single individual occupies 

 one tube, but those of a colony are so closely intertwined that the limits 

 of any one are difficult to discern. 



Distribution. — California, south to Ensefiada, Lower California; 

 intertidal to about 40 fms. 



Phragmatopoma moerchi Kinberg 

 Plate 35, Fig. 76 ; Plate 36, Figs. 80-83 ; Plate 39, Figs. 97, 98 



Kinberg, 1867, p. 349. 



Sabellaria virgini Ehlers, 1901, pp. 199-203, pi. 23, figs. 1-4, 7-12, pi. 24, 



figs. 1-5 (in part) (not Kinberg). 

 "iHermella orbifera Ehlers, 1901, p. 267. 

 Johansson, 1926, pp. 4-5; 1927, pp. 101-102. 



Collections.— 2^^-?>A (many); 829-38 (1); 831-38 (4); 832-38 

 (1); 847-38 (1). 



Other materials examined. — Type specimen, Swedish Museum (no. 

 922, Hawaii). At the U.S. National Museum, coll. by W. L. Schmitt: 

 Salaverry, Peru (1); Chaiiaral, Chile, shore (5); Talcahuano, Chile 



(1). 



The following is based on the type specimen. The flat opercular 

 crown is nearly circular, seen from the front. Middle paleal tips come 

 together only slightly off center. Outer opercular paleae are largely 

 covered by minute scales on the surface directed forward ; the distal end 

 has a characteristic thin, rectangular flange, arising from a crescentic 

 notch; its free end is more or less frayed (pi. 35, fig. 76). Middle paleae, 

 making up the flat surface of the cone, are dark brown and transversely 

 rugose, appear scabrous. Inner paleae are much smaller in size, com- 

 pletely concealed from view by the middle paleae; they are also slightly 

 roughened on their outer side. 



