NO. 4 HARTMAN : POLYCHAETOUS ANNELIDS 405 



Collections. — Many individuals come from Oregon south to southern 

 California from intertidal zones; others are from San Francisco and 

 Mission Bays, California. 



The details of the hooded hooks in abdominal segments are shown in 

 plate 43, figs. 1 and 2. Node, shoulder, and neck are easily distinguished. 

 The fang is surmounted by a crest of 3 teeth in a straight row; the teeth 

 are well separated from one another. 



Distribution. — This species is common in black sandy beaches in quiet 

 water; it sometimes occupies beds of considerable extent, especially in 

 estuarine or also brackish water. The surface mark of the vertical bur- 

 row is a tiny black cinder cone. Sexually mature individuals are sur- 

 rounded by a debris-covered tube in which the eggs are laid and early 

 development occurs. 



Gapitella ovincola, new species 

 Plate 44, Figs. 1-6 



Collection. — Monterey Bay, California, m 30 to 40 fms, from squid 

 egg mass, June 8, 1931 (many), collected by Mr. G. E. MacGinitie. 



The general form is slender, elongate; total length of a larger and 

 perhaps mature individual is about 60 mm. In individuals of both sexes 

 the first 4 segments are smooth except for shallow longitudinal wrinkles ; 

 they resemble those farther back. Segments 5 to 9 have a longitudinal 

 groove midventrally and lesser furrows at the sides. Abdominal segments 

 are long and have raised, glandular parapodia. 



The prostomium is a depressed conicaj lobe that is longer than wide; 

 it lacks eyespots and the nuchal slits are inconspicuous. The first segment 

 has spreading fascicles of capillary setae in both notopodia and neuro- 

 podia; the next 4 segments are similar or the fifth segment has some 

 hooks in the neuropodia. From the sixth segment the 2 superiormost 

 setae in notopodia and the 4 inferiormost ones \n neuropodia may be 

 replaced by hooded hooks that resemble those farther back; they are 

 accompanied by 16 to 20 pointed setae. The seventh segment is similar 

 to the sixth one except that there may be an even greater replacement of 

 hooks for pointed setae especially in the neuropodia. In female individuals 

 the eighth and ninth segments are provided with long-handled, hooded 

 hooks only ; they are arranged in a single row in each fascicle. The ninth 

 segment has about 18 hooks in each neuropodium. In male individuals 

 notopodia in the eighth and ninth segments are replaced by specialized 

 genital hooks; the eighth segment has 4 or 5 pairs, the ninth has 3 or 4 



