396 THE ANNELIDA POLYCHAETA. 



but three species from the Mediterranean; Grube in Semper's extensive collec- 

 tion from the Phihppines found but one species of this family; Gravier lists one 

 from the Red Sea ; and Ehlers lists three species from the Magellan Strait, and 

 one from the coast of Chile. Willey notes but one from Ceylon, Augener one 

 from southwest Australia, and Izuka none from Japan. Professor Haswell 

 mentions three from New South Wales. Of the five species secured by the 

 Albatross, one is from the Alaskan region, one from the Atlantic coast of the 

 United States, and the others from off Mexico and Panama, but at depths of 

 from 493 to 1,879 fms. 



The flabelligerids swallow the muddy sand in which they live. In this 

 material, when taken from their ahmentary tracts, are found diatoms, shells of 

 Radiolaria and Foraminifera, spicules of sponges, spines of such .forms as Spa- 

 tangus, fragments of Algae and other organic debris. Some are commensals, 

 such as Flabelligera commensalis Moore, which occurs among the spines of Strongy- 

 locentrotus purpuratus in Monterey Bay (Moore, Proc. Acad. nat. sci. Philad., 

 1909, p. 288). They frequentty themselves bear parasites attached to then- 

 setae, such as certain Fungi and stalked Infusoria, e.g., Vorticellae and Carche- 

 sium. Internal parasites are also known, e.g., the peculiar crustacean parasite 

 {Bradophyla pygmaea) found by Levinsen in the anterior part of the alimentary 

 canal of Brada villosa. 



Key to Genera. 



a. Branchiae and tentacles borne on one or two conspicuous jirolongations or stalks. 



6. Branchiae arising from a single protrusible stalk Zorus Webster and Benedict. 



66. Branchiae borne on two club-shaped or conical stalks. 



c. Composite neuropodial setae present; branchiferous stalks conical Piromis Kinberg. 



cc. Setae all simple; branchiferous stalks club-shaped Coppingeria Haswell. 



aa. Branchiae and tentacles not borne on stalks, or at most a moderate prominence bearing but part 

 of the branchiae. 

 6. Bearing dorsally a conspicuous median, tentaculiform process, with a smaller lateral one each 



side just caudad of the mouth opening (occurring at great depths) Buskidla Mcintosh. 



66. With no such median dorsal appendage. 



c. Bristles of first two somites fine, in length and structure but little different from the rest, not 

 forming a distinct "cage"; a pair of distinct genital papillae between the fourth and fifth 



setigerous somites Brada Stimpson. 



cc. Bristles of the first and generally also of the second and third somites mostly decidedly longer 

 and stouter than the others, commonly directed forwards and forming a "cage"; no genital 

 papillae between the fourth and fifth setigerous somites. 

 d. Body densely covered with long, filamentous, or hair-Uke papillae. 

 e. Notopodial setae all capillary and smooth. 

 /. Neuropodial setae in form of short, stout, hooked crochets; numerous branchial filaments 

 on each side of head; anterior setae forming a distinct "cage". . . .Flabelligera Sars. 

 //. Neuropodial setae numerous, very long and stout, not crochet-formed ; not with numer- 

 ous branchial filaments each side of head; anterior setae not forming a distinct "cage"; 

 body very broad in proportion to length Ilyphagus, gen. nov. 



