80 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



The anal cirrus is a very long, slender filament on a short basal 

 stalk, its total length exceeding that of the length of the body. The 

 basal stalk is inserted on the right side, but the cirrus is directed 

 medially. The homologous basal structure on the left side is a small 

 globular stalk without a filament. 



The variations observable in the descriptions, as E. geayi Fauvel, of 

 specimens from widely scattered areas (West Africa by Augener, 

 Madagascar by Fauvel, New Caledonia by Pruvot) are of approximate 

 magnitudes as are those to be seen in the collections from the western 

 coasts of the Americas. The description of E. geayi agrees reasonably 

 well with that of E. fimbriata (Augener, 1918, p. 153) and with the 

 collections available for study. The name, E. fimbriata, has priority. 



This is the first record of this genus from the eastern Pacific and, 

 so far as I am aware, from the northern Pacific. The author has col- 

 lected several specimens from low littoral areas near the mouth of 

 Mission Bay, southern California, in a substratum of muddy sand. The 

 burrows were 10 inches or more below the surface. No tube was present, 

 and no commensalism or association with other organisms could be de- 

 tected. The sand flat harbors an Arenicola, and a species of Poecilo- 

 chaetus, representative of another family which has not heretofore been 

 recorded from the northeast Pacific. 



In life uniform white, glistening, smooth, contrasting with the dark 

 muddy sand it inhabits. 



Distribution. — West Indies; Madagascar; New Caledonia; Ecua- 

 dor ; Guatemala ; Mission Bay, southern California. Intertidal to 20 fms. 



Family Polyodontidae 



Only 2 genera, Polyodontes Renier (=Jcoetes Audouin and M. 

 Edwards) and Pant kalis Kinberg, are represented in the collections of 

 the Hancock Expeditions. These two genera are so nearly related that 

 it has sometimes been doubtful whether a species should be relegated 

 to one or the other of them. Thus, for example, Panthalis melanonotus 

 Grube has been regarded as a Panthalis (Fauvel, 1919, p. 339) and 

 later transferred to Polyodontes (Monro, 1931, p. 8; Fauvel, 1932, p. 

 37). P. melanonotus is provided with penicillate setae (as in Panthalis) 

 and some of its parapodia are provided, though sparsely, with branchial 

 lobes (as in Polyodontes). 



