332 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



fig. 13). The anal tongue is broadly rounded, with entire margin and a 

 small elongate papilla on its dorsal side. Uncini have 4 major teeth in a 

 single series and 4 or 5 smaller ones distally (pi. 50, fig. 14). (Johnson 

 found 4 teeth usually, 5 rarely.) 



The materials examined (listed above) extend the known range from 

 Alaska south to Tangola-Tangola, western Mexico, in depths ranging 

 from intertidal to 40 fms (Santa Cruz Island). 



Gistenides regalis (Verrill) 

 Plate 50, Figs. 9, 10 



Pectinaria regalts Verrill, 1901, p. 38, pi. 8, figs. 6, 7. 



Collections. — 292-34, Socorro Island, Mexico, dredged in 30 fms 

 (1 specimen and tube); 129-34, Braithwaite Bay, Socorro Island, in 

 14-18 fms (1 tube). 



Cephalic setae are stout, brassy yellow, number 1 1 or 12 on a side, and 

 taper distally to fine points. The antennular membrane has 21 to 30 

 fringes. There are 16 setigerous segments and 12 uncinigerous ; the six- 

 teenth setiger is made out with difficulty because of the greatly reduced 

 size of the fascicle. Scaphal setae number only 3 or 4 on a side ; they are 

 pale, straight or nearly so, distally blunt (pi. 50, fig. 10). Uncini have 

 their major teeth disposed in single series, number 10 to 12, but these 

 intergrade in size and form with the fine, medial teeth (pi. 50, fig. 9). 

 The shorter notosetae resemble the longer except that they have a denticu- 

 late edge. 



C. regalts is to be classed with the larger forms, using coarse, light- 

 colored sand grains in its tube (pi. 51, fig. 18). It has been known only 

 through collections made by Verrill (1901) from Bermuda. I have ex- 

 amined the original materials at the Peabody Museum of Natural His- 

 tory, Yale University, where there are numerous fine examples, taken 

 from Coney Island and from other points in Bermuda. The specimen 

 from Socorro Island, Pacific side of Mexico, agrees well with individuals 

 from Bermuda. 



Subgenus Pectinaria Malmgren 

 Type P. belgica (Pallas) 



This differs from Gistenides Malmgren in that the uncini are pro- 

 vided with 2 or more rows of teeth in the major series, instead of a single 

 series. The tube is straight or only slightly arcuate. 



