TEREBELLIDAE. 421 



gg. Setae beginning on third somite; setigerous somites numerous. 



Setae laminate, with tips entire, some straight and some geniculate. 



Laphania Malmgren. 

 //. Uncini relatively short at base, with the vertex elevated and showing a larger number 

 of crenulations (7-11); teeth in series typically fewer. 

 g. Uncini with posterior prolongation. 



Setae all with tips entire, beginning on fourth somite; few somites setigerous. 



Pherea St. Joseph. 

 gg. Uncini without posterior prolongation. 



h. Setae all with tips entire, beginning on fourth somite Bathya St. Joseph. 



hh. Setae in part with tips entire, others with tips dentulate, beginning on third somite. 



Prodea St. Joseph. 

 ee. Branchiae present. 



/. Capillary setae beginning on the fourth distinct somite. 

 g. Setae with apex dentulate. 



h. Trunk of branchiae reduced, the branches simple filaments. (Posterior nephridia 



on each side connected) Amphitrite O. F. Miiller. 



hh. Trunk of branchiae well developed, the branches subdivided or branched. 



i. All nephridia free from each other Neoamphitrite Hessle. 



a. Posterior nephridia on each side united together by a longitudinal canal. 



Terelella Linne. 

 gg. Setae with apex entire. 



h. Uncini of some of anterior somites having a long prolongation or manubrium from 

 posterior side of base. 

 i. With two pairs of subulate branchiae like those typical in the Ampharetidae. 



Eupistella, nom. nov. 

 a. With from one to three pairs of ramose branchiae. 



j. Nephridia all free from each other Pista Malmgren. 



jj. Posterior nephridia on each side united by a longitudinal canal (uncini of 



double rows interlocking) Lanicides Hessle. 



hh. Uncini squat, base of medium length, without such posterior prolongation. 

 i. Vertex with two crenuli and two transverse series of denticles at vertex. 

 j. With two pairs of ramose branchiae. 



Uncini squat, two rows of 3-5 teeth, in a single row, or rarely in a double inter- 

 locking series on certain somites Nicolea Malmgren. 



jj. With three pairs of ramose branchiae; uncini with two series of but 1-3 teeth. 



k. Uncini of elevated form, with no lateral salient or fixing ligament, fixed alone 



by the muscle at the anterior inferior angle of the base; two rows of 



opposing uncini on a number of the somites Lanice Malmgren. 



kk. Uncini squat, with a small lateral salient and fixing ligament; two rows of 

 interlocking uncini (or rarely single rows alternating) . . Eupolymnia Verrill. 

 ii. Vertex of uncini with three or more crenuli and three series of denticles. 

 j. Thoracic uncini with three crenuli at vertex. 



First four somites with no lateral foliaccous lobes; a single pair of branchiae. 



E-uscione, nom. nov. 

 jj. Thoracic uncini with four or five crenuh at vertex. 



k. First four somites with lateral foliaceous lobes, the last pair united across 



dorsum; one pair of branchiae; five series of denticles . . . .Scionella Mooie. 



kk. First four somites with no such lateral foliaceous lobes; three pairs of 



branchiae; four series of denticles Scionides, gen. nov.' 



ff. Capillary setae beginning on the second or third distinct somite (all with apex entire 

 excepting in Neoleprea). 

 g. Setae beginning on the second somite and occurring on a large number of somites. 

 h. Branchiae arborescent (three pairs, in type on somites II, III, and VI). 



Polymrdella Verrill. 

 hh. Branchiae cirriform or subulate. 



i. With four clusters of cirriform branchiae Eugrymaea VerrDl. 



' Genotype, Terebella reticulala Ehlers. 



