352 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



tips come together somewhat off center. Abdominal uncini have typically 

 6 teeth, seen from the side. 



P. virgini was originally described from the Strait of Magellan. 

 Later, Ehlers (1901, pp. 199-203) described at length some specimens 

 which cannot be ascribed to P. virgini Kinberg, since the outer opercular 

 paleae differ (see P. moerchi, above). Sabellaria (Phragmatopoma) 

 virgini Monro (1933, pp. 1062-1063, fig. 11) is similarly not P. virgini 

 Kinberg, but appears to differ from others; I am referring it herein to 

 P. attenuata (below). 



Distribution. — P. virgini is known only from southern Chile, in the 

 vicinity of the Strait of Magellan ; it is intertidal. 



Phragmatopoma attenuata, new species 

 Plate 38, Figs. 90-96 ; Plate 39, Figs. 100-101 



ISabellaria virgini Ehlers, 1901, p. 199, pi. 23, figs. 5, 6 (in part). 

 Sabellaria (Phragmatopoma) virgini Monro, 1933, pp. 1062-1063, fig. 

 11 {not Kinberg). 



Collections.— \<d-?>?> (many); 15-33 (several) ; 229-34 (5) ; 403-35 

 (many). 



Other materials examined. — ^At the U.S. National Museum, collected 

 by Dr. W. L. Schmitt: Salinas, Ecuador, shore (many) ; south side of 

 St. Elena Point, Ecuador, shore (several). 



The opercular crown is high, conical, asymmetrical in lateral view 

 (pi. 38, fig. 90), the dorsal paleae directed toward the ventral side so 

 that their free ends approach one another ventrally. Mature individuals 

 attain a length of about 35 mm ; body width is about 4 mm. The abdom- 

 inal region is usually closely speckled with black spots. Opercular paleae 

 in the outer row number about 22-25 or at most 38-40 pairs; those of 

 the middle and inner rows number 12 to 19 pairs each. Oral tentacles 

 are arranged in about 12 to 14 rows. There are 2 anterior thoracic and 

 3 parathoracic segments, as typical of the genus. Abdominal setigers 

 number about 31. The caudal tail is smooth, cylindrical, about as long 

 as the last 8 to 10 setigerous segments. 



Outer opercular paleae are unique in the character of their distal 

 appendage; it consists of a palmately filamentous membrane, directed 

 nearly at right angles to the main shaft (pi. 38, figs. 91, 92) ; the shaft 

 itself has a strong, recurved tooth on the side facing ventral and is weakly 

 scabrous on its upper surface (pi. 38, fig. 96). Middle opercular paleae 

 are dark brown, resemble one another save that those on the dorsal side 

 (pi. 38, fig. 93) are notably larger and stronger than those on the ventral 



