CHAETOPTERIDAE. 303 



horny jaws or paragnatha, each of which is normally composed of two pieces. 

 The jaws are arranged in various series, mostly two to five in number. 



In distribution and habits very similar to the Glyceridae with which they 

 form a natural and compact group, which I believe it advantageous to designate 

 as a superfamily, the Glyceroidea. 



Key to Genera. 



a. An insensible transition from the uniramous parapodia to the biramous; with no chitinous pieces 



on the sides of the proboscis Glycinde F. Miiller. 



aa. Two regions of body clearly distinct in the character of their parapodia; chitinous pieces in adults 

 on each side of proboscis, these V-shaped and joined together .Gomarfa Audouin and Milne Edwards. 



Epicaste Kinberg (1865) and Eone Malmgren (1865) are synonyms of 

 Glycinde F. Muller. 



GoNiADA Audouin and Milne Edwards. 



Hist. nat. litt. France. Annelides, 1834, 2, p. 244; Quatrefages, Hist. nat. annelcs, 1865, 2, p. 191; 



Arwidsson, Bergens mus. aarbog, 1908, no. 11, p. 34; McIntosh, British annelids, 1910, 2, pt. 2, 



p. 462. 

 Ophioglycera Verrill, Proc. U. S. N. M., 1885, 8, p. 436. 



GoNiADA EREMiTA Audouin and Milne Edwards. 



Hist. nat. litt. France. Annelides, 1834, 2, p. 247, pi. 6A, fig. 1-4; Quatrefages, Hist. nat. anneles, 

 1865, 2, p. 191; Ehlers, Borstenwurmer, 1868, p. 704, pi. 24, fig. 49-51; McIntosh, British 

 annelids, 1910, 2, pt. 2, p. 466. 



Locality. Georgia: off Savannah. Sta. 2419 (lat. 33° 34' N., long. 76° 

 40' 30" W.). Depth 107 fms. Bottom of fine grey sand with black specks. 

 Bottom temp. 60.3° F. 2 April, 1885. One incomplete specimen. 



A species widespread, occurring on both sides of the Atlantic. On the 

 American side it seems to be common in the more southern latitudes, but off 

 the New England Coast it is rare as compared with the well-known G. maculata 

 Oersted. 



Ch aetopteridae . 



In this highly specialized family the body is divided into either two or 

 three distinct regions, of which the sharply defined anterior one is composed 

 usually of from nine to fourteen somites. All live in tubes of parchment-like 

 texture, to which they are rather strictly confined and adapted. 



The prostomium is small and often inconspicuous. It is without append- 

 ages, but usually bears a pair of eyes. 



The peristomium forms a collar which often almost completely encloses 



