NO. 1 hartman: goniadidae, glyceridae, nephtyidae 89 



noted, however, that this genus is characterized mainly for reduction 

 or loss of parts, and for the small size of its individuals, and apparently 

 not for any major morphological character such as separates Nephtys 

 from Aglaophamus. 



A conspicuous character among species of this family concerns the 

 nature of the interramal cirri (— intercirri). In species of Nephtys they 

 are distinctly curved outward or recurved (pi. 13, fig. 3) ; in species of 

 Aglaophamus they are curved inward or involute (pi. 18, fig. 3). In 

 Micronephthys the interramal cirri are nearly or quite absent. Most of 

 the numerous species of the family can thus be referred to one of these 

 3 groups. Other less obvious, though perhaps more significant, char- 

 acters typically accompany this feature. Thus, furcate setae (pi. 18, 

 fig. 4) are usually present in species with involute cirri; their presence 

 is doubtful for species in the other 2 groups. Acicular lobes appear on 

 the whole more acutely pointed in species of Aglaophamus and are usu- 

 ally rounded or incised in species of Nephtys. The aciculum is fre- 

 quently sharply recurved at the tip (pi. 19, fig. 4) in species of Aglao- 

 phamus and bluntly conical in species of Nephtys. 



Key to Genera of NEPHTYIDAE 



Interramal cirri recurved (pi. 13, fig. 3) . . . . Nephtys, p. 89 



Interramal cirri involute (pi. 18, fig. 3) . . Aglaophamus, p. 116 



Interramal cirri absent or nearly so . . . Micronephthys, p. 130 



Genus Nephtys Cuvier, 1817 

 Type N. ciliata (Muller) 



This has been spelled also Nephthys Savigny, 1818, Nephtis Audouin 

 and Edwards, 1834, Nepthys Chamberlin, 1919a. It includes Portelia 

 Quatrefages, 1865, Diplobranchus Quatrefages, 1865, and partly Aonis 

 Savigny, 1818. 



Interramal cirri are recurved and present on most body segments. In 

 shape they are cirriform to clavate; their lateral margins may be ex- 

 panded, flattened or foliaceous to somewhat frilled. Preaccicular setae 

 are usually transversely barred ; postacicular setae are lanceolate and 

 may have a margin that is entire, or delicately serrated, or denticulate, 

 or with a few sharp teeth or a spur. Parapodial acicula occur singly and 

 are pale to dusky in color; they are embedded or project slightly. A- 

 cicular lobes may be incised to broadly or gently rounded at the distal 

 edge. 



