NO. 5 hartman: polychaetous annelids 331 



Genus PEGTINARIA Lamarck 

 Subgenus GiSTENiDES Malmgren 

 Type G. granulata (Linnaeus) 



The dorsal margin of the cephalic plaque is entire; the antennular 

 membrane is fringed, entirely free from the paleal segment, and usually 

 more or less surrounds the base of the oral tentacles. Setigerous segments 

 vary from 15 to 17 in number, uncinigerous from 12 to 13. Uncini have 

 a single series of larger teeth, varying from 3 to 10 or 14. Notopodial 

 fascicles typically have long, pointed setae of 2 kinds, a longer, broader, 

 limbate seta with entire margin, and a shorter, slender one with cutting 

 edge denticular, incised or smooth. The tube is more or less arcuate 

 (brevicoma, regalis, granulata, hyperborea, gouldii). 



Gistenides brevicoma (Johnson) 

 Plate 50, Figs. 13, 14, 16; PI. 52, Fig. 23 



Pectinaria brevicoma Johnson, 1901, pp. 423-424, pi. 15, figs. 151-156; 

 Moore, 1909, p. 277. 



Collections. — 259-34, Tangola-Tangola, Mexico, in 15-20 fms, (1) ; 

 887-38, east of Middle Farallon Island, in 37 fms, (2) ; 1191-40, south 

 side of Santa Cruz Island, in 37-40 fms, ( 1 ) ; Burch 397, off Redondo 

 Beach, dredged, (14 tubes) ; Burch 3924, off Redondo Beach, in 25 fms, 

 (1) ; Dillon Beach, California (collection by Dr. O. L. Williams), lit- 

 toral, (1) ; Monterey shales, California (collection by E. F. Ricketts), 

 (1) ; Wollochet Bay, Washington (collection by E. F. Ricketts), (4). 



In all examples the tube is dark, composed of moderately coarse black 

 with white sand grains. It measures to 52 mm long, 8 mm wide at its 

 larger end, and 2 mm at its narrower end; it is distinctly arcuate (pi. 50, 

 fig. 16). A specimen from a longer tube measures 31 mm long. Setigerous 

 segments have the following arrangement: 3 anterior segments with 

 limbate setae disposed in fascicles that are about as large as those follow- 

 ing; 12 segments provided with pointed setae dorsally and uncinigerous 

 tori ventrally (Johnson originally described 13 uncinigerous segments), 

 followed by 2 setigers with greatly reduced notopodial fascicles. 



There are 12 or 13 pairs of brassy yellow, cephalic paleae, short, dis- 

 tally blunt save the outermost, which are shorter, taper rapidly to pointed, 

 acute tips. The antennular membrane has 28-30 marginal papillae (John- 

 son described 33). The 2 pairs of branchiae are short, nearly equal to each 

 other in size. Scaphal setae number 8-10 pairs, are distally hooked (pi. 50, 



