100 THE ANNELIDA POLYCHAETA. 



j. Neurocirri present on the anterior somites bearing only simple setae. 



Prolopadorhynchiis Bergstrom. 

 jj. Neurocirri not present on these somites. 



A;. Proboscis without papillae; without prominent nuchal processes. 



Lopadorrhynchus Grube. 

 kk. Proboscis on each side with a long, finger-like papilla; on each side of pro- 

 stomium a large branched nuchal process prominently extended. 



Mastigethus, gen. nov. 

 a. Prostomium fused with the first normal somite as well as with the preceding; 



neurocirri on all somites Reibischia Bergstrom. 



dd. Tentacular cirri occurring on three somites, one pair on each Protomystidinae. 



Protomystides Czerniavsky. 

 ee. Either four pairs of tentacular cirri or but three, in the latter case two pairs on the first 



somite Phyllodocinae. 



f. With four pairs of tentacular cirri. 



g. All somites bearing tentacular cirri wholly free. 

 h. All parapodia with two acicula. 

 i. All somites bearing tentacular cirri fully developed. . . . Austrophyllum Bergstrom. 

 a. First somite dorsally reduced. 



j. Ventral cirrus of second segment fohaceous and asymmetrical. 



Hesperophyllum Chamberlin. 



jj. Ventral cirrus not fohaceous and asymmetrical Notophyllum Oersted. 



hh. All normal parapodia with a single aciculum. 



i. All somites bearing tentacular cirri fully developed; a median tentacle present. 

 j. All tentacular cirri filiform or fusiform; proboscis distally diffusely papillose. 



Eulalia Savigny. 

 jj. Tentacular cirri not all filiform or fusiform, ventrals of II modified. 



k. Ventral tentacular cirri of second somite thick, asymmetrical, the others fili- 

 form or fusiform; proboscis smooth Natalia Bergstrom. 



kk. Ventral tentacular cirri of second somite thin, foliaceous, asymmetrical; the 



entire proboscis diffusely papillose Steggoa Bergstrom. 



ii. First tentaculo-cirriferous somite dorsally reduced. 

 j. An unpaired tentacle present. 



k. Proboscis smooth; all tentacular cirri filiform or fusiform. 



Eumida Malmgren. 

 kk. The entire proboscis papillose. 



I. Tentacular cirri filiform or fusiform Pirakia Bergstrom. 



U. The ventral tentacular cirri of somite II thin and foliaceous, asymmetrical. 



Sige Malmgren. 

 jj. No unpaired tentacle but with a nuchal papilla. 

 k. All tentacular cirri filiform or fusiform. 



I. Proboscis proximally with papillae in series Anaitides Czerniawsky. 



U. Proboscis proximally with papillae diffuse PhyUodoce Savigny. 



kk. Only the dorsal tentacular cirri of second somite filiform, the others short, 



thick, and almost globular Sphaerodoce Bergstrom'. 



gg. Not all somites bearing tentacular cirri free. 



h. Prostomium free, but the first two somites fused with each other. 

 i. The tentaculo-cirriferous somites fully developed, forming dorsally a collar-like 

 sweUing; proboscis with two lateral rows of large papillae. .Paranaitis Southern. 

 ii. Tentaculo cirriferous somites dorsally strongly reduced; proboscis diffusely papil- 

 lose. 



j. All tentacular cirri flask-shaped Genetyllis Malmgren. 



jj. Tentacular cirri of I and the ventrals of II filiform, the others flattened, 



fohaceous Nereiphylla Blainville. 



hh. Prostomium fused with one or more of the succeeding somites. 



1 Bergstrom {op. cit., 1914, p. 87) first mentions this genus with its type-speoies (PhyUodoce quadra- 

 ticeps) under the name Globidoce; but on subsequent pages, and in the diagnoses, Sphaerodoce is used. 

 The occurrence of Globidoce in the text was undoubtedly an oversight. 



