388 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



PLATE 42 

 (Photographs by Dr. Waldo L. Schmitt, at Salinas, Ecuador.) 



Figure 106, Phragmatopoma attenuata: tube masses exposed at low 

 tide, looking toward the sea; the lower left-hand corner indicates 

 the barnacle zone. 



Figure 107, same, more highly magnified, showing the interlacing of 

 tubes and oral apertures; the upper left-hand corner marks the 

 barnacle zone. 



I 



