152 [AssE^rBLT 



Fam. CAPITELLID.E. 



NOTOMASTUS Sars. 



Reise i Lofoten og Fiumarken, p. 199. 1S50 

 Fauna Littoralia Nor\vegi;e, p. 13. 1856. 



I have referred the following species to ISTotomastus Sars, al- 

 though somewhat in doubt as to what constitutes a Notomastus. 

 The following species of this genus and of the allied or identical 

 genus Ancistria have been reported from our coast: JVotomastus 

 luridus Yerrill, Notomastus filiforniis Yerrill, Ancistria acuta 

 Yerrill, Ancisti'ia capillaris Yerrill and Ancistria minhna 

 QtjATREFAGES (reported by Webster). It is quite certain that these 

 five species belong to the same genus, but to what genus? Certainly 

 to Ancistria Quatr., if it ia a good genus. But Claparede says 

 that Ancistria is a synonym of CAprrELLA, But so far no one has 

 seen the peculiar male sexual organs and setoe upon which so much 

 stress is laid as characteristic of Capitella. Prof. Yerrill writes 

 that he has never found them ; I have never let a specimen pass 

 Avithoiit looking for these organs, but to no purpose. Accordingly, 

 while our specimens belong to Ancistria, they do not belong to 

 Capitella. It will be noticed that two of our species have been re- 

 ferred to Notomastus ; and in fact they cannot be said to differ 

 from Notomastus except in the length, and number of sette, of the 

 ventral rami. But Claparedo speaking of the " tores hamiferes ven- 

 traux," says (Glanures, p. 58): "Lo developpement extraordinaire 

 des tores ventraux diicote dorsal est memo le caract^re essentiel des 

 Notomastus," according to which dictum not one of our species is a 

 Notomastus, as they have not tho elongated ventral rami and nu- 

 merous setpe of the type species, Notomastus latericeus Sars. In re- 

 gard to Arenia Quatr., Claparede (Annel. Chet. du Golfede N., p. 

 18) claims thatis a N"otomastus, and that tho type species, A. cruenta 

 QuATR., is Capitella {Notomastus) ruhicanda Keferstein. In this 

 case one must believe that Quatrefages entirely mistook the char- 

 acter of the posterior dorsal setos, since he describes and figures them 

 as capillary. 



Notomastus filiformis Yerrill.'^ 



PLATE (V), Viri, FIGS. 51-54. 

 Invert. An. Vin. Sound, etc., p. 611. 1874. 



Head very small, pointed, conical. 



Proboscis apparently smooth ; when magnified seen to be covered 

 with minute papillie. 



First five setigerous segments with capillary setae in both rami, 

 not differing from each other, arranged in each ramus in a single 

 transverse series, containing from eight to twelve setag. After the 

 fifth segment uncini only arc found. At first the uucini are quite 



* I regarded this as a new species, and gave it the specific name of Icevis; but on sub- 

 mitting specimens of the same form, taken at Proviucetown, Ma33., to Prof. Vorrill, he 

 referred them to his N. filiformis. 



