NO. 1 HARTMAN : GONIADIDAE, GLYCERIDAE, NEPHTYIDAE 43 



arc of 10 H-shaped pieces and 2 or 3 tiny ones believed to be dorsal, and 

 3 larger H-shaped pieces in a short arc thought to be ventral (the doubt 

 is due to imperfect material). 



The first 30 or 31 segments are uniramous and the separation be- 

 tween anterior and posterior regions is not sharp. Only the presence of 

 spinelike notosetae indicates a change from anterior to posterior regions. 

 Neuropodia do not change greatly from front to back, except that the 

 setal lobes enlarge somewhat in going back, and the spinigerous setae 

 come to be very long in postmedian segments, perhaps signaling an 

 approach to epitoky. The presetal lobe is long and entire; it extends far 

 beyond the blunt, entire postsetal lobe (fig. 7). Farther back, in poster- 

 ior segments, the presetal lobe comes to be somewhat erect but it is 

 still entire. Notopodial lobes are small and nowhere conspicuous. In the 

 figure they are shown in dotted outline. 



Notosetae consist of 3 or 4 blunt, slightly curved, acicular, yellow 

 spines in each notopodium. They project for some distance from the 

 lobe. Neurosetae are entirely composite; they include both falcigerous 

 and spinigerous ones in all neuropodia where they have been observed 

 (in some segments they are distally broken off). The falcigerous setae 

 occupy a position in superior and inferior ends of the fascicle ; they num- 

 ber usually only one to 3 or 4 in any position. Spinigerous setae are in 

 median (fig. 7) positions and much longer. Those in posterior segments 

 are far longer than similar ones in anterior segments. 



Goniadella gracilis was originally described only approximately 

 so that its generic characters have remained obscure. The prostomium 

 has 2, not one, pairs of eyes; the so-called bilobed neuropodium is actual- 

 ly entire and not to be confused with the ventral cirrus. Setae were said 

 to be long, slender, acute and many of them curved. Actually, they 

 consist of spinigerous and falcigerous appendaged ones, in definite pat- 

 tern. 



This species was first referred to Eone (Verrill, 1873, p. 596) and 

 later to Goniada (Verrill, 1880, p. 174) with the explanation that the 

 proboscis has chevrons (called V-shaped denticles) and jaws as in 

 Goniada. Webster and Benedict (1884, p. 723) redescribed the species, 

 but for the setae stated only that they are "short, simple, a little curved 

 at the apex." Also, short and long ones are shown intermingled with 

 one another, instead of occupying definite positions in the fascicles. 

 The distal prostomial eyes were shown, not in the distal ring, but in 

 the third ring from the end. The proboscis was not described. Because 

 of these errors, Arwidsson (1899, p. 34) was unable to place the species 

 in his grouping of the family. 



