256 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Nothria iridescens (Johnson) 



Northia iridescens Johnson, 1901, p. 408, pis. 8, 9. 

 Hartman, 1944, pp. 118-120, pi. 5, figs. 99-104. 



This is found in muddy sand flats in Tomales Bay ; it inhabits a thin, 

 mucoid tube, externally covered with a thin layer of fine sand. Length is 

 over 150 mm. 



Family Lumbrineridae 



Key TO Species 



1. Larger; anterior parapodia provided with simple hooks; usually 

 reddish brown or with a green cast . . Lumbrineris zonata 



1. Smaller; anterior parapodia provided with composite hooks; 

 usually pale pink or orange in life . . Lufnbrineris latreilli 



Lumbrineris zonata Johnson 



Johnson, 1901, pp. 408-409, pi. 9, figs. 93-100; Hartman, 1944, pp. 202- 

 204. 

 This is the commonest lumbrinerid in the vicinity of Dillon Beach. 

 It occurs in the flats of Tomales Bay and Bodega Lagoon, also along 

 sandy beaches or where sand is lodged in pockets behind large boulders. 

 Length is over 100 mm. 



Lumbrineris latreilli Audouin and Edwards 



Fauvel, 1923, pp. 431-432, fig. 171 ; Hartman, 1944, pp. 221-223, pi. 9, 

 figs. 213-216. 

 At Tomales Point, ocean side, this occurs in rocky crevices. Length 

 is 45 to 70 mm. 



Family Arabellidae 



Key to Species 



1. Parapodia with a heavy projecting acicula; prostomium lacks 

 eyespots ; very long, threadlike Drilonereis nuda 



1. Parapodia without heavy projecting acicula; prostomium with 

 transverse row of 4 eyespots near posterior margin ; body thicker 

 but also cylindrical Arabella iricolor 



