AMPHARETIDAE. 443 



dd. With four pairs of brancliiae. 



e. Notopodia of thirteenth segment shoved dorsad Anobothnis Levinsen. 



ee. None of notopodia shoved dorsad Ampharete Malmgren. 



cc. More than fourteen somites bearing capillary setae. 



d. Fifteen somites bearing capillary setae Sosane Malmgren. 



dd. More than fifteen somites bearing capillary setae. 



e. Sixteen somites bearing capillary setae Lysippe Malmgren. 



ee. Seventeen somites bearing capillary setae. 



/. Three pairs of branchiae Aryandcs Kinberg. 



ff. Four pairs of branchiae. 



g Notopodia with cirri Amphiclius Grube. 



gg. Notopodia without cirri Lysippidcs Hessle. 



aa. No paleae present. 



6. One or two stout dorsal spines caudad of the branchiae on each side; number of somites large, 



near seventy or more Melinninae. 



c. With two pairs of branchiae, these all iiinnately branched Oeorpata Kinberg. 



cc With four pairs of branchiae, all, or at least part, of which are simple. 



d. With a greatly prolonged, flattened, and relatively narrow process extending forward from 

 the anterior face of the prostomium above the tentacular lobe; two spines on each side 



caudad of the branchiae Moyanus, gen. nov. 



dd. With no such elongate prostomial process; a single spine caudad of the branchiae on each 

 side. 

 e. Branchiae all simple, cirriform; eighteen somites bearing capillary setae. 



Mdinna Malmgren. 

 ee. Inner branchiae on each side pinnately branched, the others cirriform; seventeen somites 



bearing capillary setae Isolda F. Miiller. 



66. No postbranchial stout spines; the number of somites from twenty to fifty-five, but usually less 



than forty Samythinae. 



c. No tentacles. 



d. Fifteen pairs of fasciae of capillary setae; four pairs of branchiae. 



e. Tentacles of one type, simple, smooth PhyUocottius Grube. 



ee. Tentacles of two types, one simple and the other pinnately branched. 



Schistocomus Chamberlin . 

 dd. Fourteen pairs of fasciae of capillary setae; branchiae two or three pairs. 



e. Two branchial filaments, basally connate, on each side Aucheuoplax Ehlers. 



ee. A group of three branchial filaments on each side Glyphanostomuin Levinsen. 



cc. Tentacles present. 



d. Fourteen somites bearing capillary setae. 



e. Tentacles ciliated Sabellides Milne Edwards. 



ee. Tentacles smooth. 



/. Frontal lobe of prostomium much broader than long, with no processes or tubercles at 

 the anterior corners; uncini with five teeth, the inferior lobe narrow and subacute. 



Amage Malmgren. 



ff. Frontal lobe of prostomium narrow, about as long as wide, and with a tubercle at each 



anterior corner; uncini broad, with four teeth (double), the inferior lobe broad and 



very blunt GricbianeHa Mcintosh. 



dd. Fifteen or more somites bearing capiUary setae. 

 e. Fifteen somites bearing capillary setae. 



/. With two pairs of branchiae Melinnopsis Mcintosh. 



//. With three or four pairs of branchiae. 



g. With four pairs of brancliiae Sosanopsis Hessle. 



gg. With three pairs of branchiae. 



h. Branchiae in two well-separated groups; tentacles borne on a conspicuous probosci- 

 form organ nearly a third as long as the thorax, inclusive of prostomium proper; 



no tubercles above abdominal pinnules Pabits, gen. nov. 



hh . Branchiae in a continuous transverse series without median interval ; tentaculif- 

 erous region not thus prolonged into a probosciform organ; a tubercle above 



each abdominal pinnule Samythella Verrill. 



ee. More than fifteen somites bearing capillary setae. 



/. Seventeen somites bearing capillary setae; three pairs of branchiae. 



