260 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Boccardia uncata Berkeley 



Berkeley, 1927, p. 418, pi. 1, figs. 9-13; Hartman, 1941, pp. 290, 304, 

 pi. 48, fig. 46. 

 At Tomales Point, ocean side, a posterior fragment was taken. Length 

 Is over 25 mm. 



Nerine cirratulus (delle Chiaje) 



Fauvel, 1927, p. 36, fig. 11 ; Berkeley, 1932, pp. 313-314. 



Several individuals were taken in Tomales Bay, in muddy sand flats. 

 Length is over 40 mm. 



Pygospio californica Hartman 



Hartman, 1936, pp. 50-51, figs. 17-19. 



This occurs commonly in clean sandy beaches at Dillon Beach ; in 

 life it is dull green. Length is 15 to 25 mm. 



Spio, sp. 

 Fauvel, 1927, p. 43. 



This was taken in Tomales Bay, at middle low-tide line. 



Streblospio benedicti Webster 



S. lutincola Hartman, 1936, pp. 45-46, figs. 1, 2. 



In Bodega Lagoon, this is very common at the surface at moderately 

 low water line. It inhabits soft, limp tubes near the surface of the mud 

 flats, but is apt to be overlooked because of its minute size. Length is 8 

 to 15 mm. 



Family Magelonidae 



Magelona pitelkai, new species 

 Plate 19, Figs. 1-9 



Several specimens were taken in Tomales Bay, another in Bolinas 

 Bay. The body is long, slender, depressed cylindrical, as typical of the 

 genus. Length of 54 segments (posteriorly incomplete) is about 35 mm 

 (preserved). Anterior and posterior regions are not sharply set ofli from 

 one another by a constriction, and the ninth segment is not conspicuously 

 different from the others. The prostomium is large, flat, spatulate, broader 

 than anterior segments; it has a broadly rounded frontal margin, with- 

 out frontal horns; on its dorsal surface there are double longitudinal 

 ridges medially (pi. 19, fig. 1 ) . There are no eyes or other pigment marks. 

 The proboscis (everted in some individuals) is a great, spherical, smooth 

 sack. The paired palpi are long, papillated, as typical of the genus. 



