152 [Assembly 



Fam. CAPITELLID^. 



XOTOMASTUS Sars. 



Reise i Lofoten og Fiumarken, p, 199. 1850 

 Fauna Littoralis Sror\vegiiB, p. 13. 1856. 



I have referred the following species to Notomastus 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 hav^e been reported from our coast: NotomasUis 

 luridus Verrill, Notomcustus fiUforrtiis Yerrill, Aiicistria acuta 

 Yerrill, Ancistria capillaris Yerrill and Ancistria minima 

 Quatrefages (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 is a good genus. But Claparede says 

 that Ancistria is a synonym of OAprrELLA. 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 

 without 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 NoTOMxiSTus except in the length, and number of seta3, of the 

 ventral rami. But Claparede speaking of the " tores ham if eres ven- 

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

 des tores ventraux diicote dorsal est meme le caractere essentiel des 

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

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

 merous seta3 of the type species, Notomastus latericeus Sars. In re- 

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

 18) claims thatis a Notomastus, and that the type species, A. cruenta 

 QuATR., is Capitella {Notomastus) ruhicunda Kbferstein. In this 

 case one must believe that Quatrefages entirely mistook the char- 

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

 as capillary. 



Notomastus filiformis Yerrill* 



PLATE (V), VIII, FIGS. 51-5-1. 



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



Head very small, pointed, conical. 



Proboscis apparently smooth ; when magnified seen to bo covered 

 with minute papillie. 



First five setigerous segments with capillary setae in both rami, 

 not dilfering from each other, arranged in each ramus in a sinorle 

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

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



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

 mitting specimens of the same form, taken at Provincetown, Mass., to Prof. Verrill, he 

 referred them to his N. filiformis. 



