152 [Assembly 



Fam. CAPITELLID^E. 



NOTOMASTUS Sars. 



Reise i Lofoten og Finmarken, p. 199. 1850 

 Fauna Littoralis Norwegife, p. 13. 1856. 



I have referred the following species to Notomastus Sa7's, 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: JVotomasiits 

 Iwidus Verrill, Notomastus filiformis Yerrill, Ancistria acuta 

 Yerrill, Ancistria capUlaris Yerrill and Ancistria Tninima 

 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 is a good genus. But Claparede says 

 that Ancistria is a synonym of Capitella. But so far no one has 

 seen the peculiar male sexual organs and setse 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 NoTOMASTUs except in the length, and number of set?e, of the 

 ventral rami. But Claparede speaking of the " tores haraiferes ven- 

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

 des tores ventraux da cote 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 setiB of the type species, Nofomastus latericeus Sars. In re- 

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

 18) claims thatis a N^otomastits, and that the type species, A. cruenta 

 Quatr., is Capitella {Notomastu8)ruhicunda Kefebstein. 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), Vlir, FIGS. 51-51. 



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



Head very small, pointed, conical. 



Proboscis apparently smooth ; when magnified seen to be covered 

 with minute papilliB. 



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 setse. After the 

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



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

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

 referred them to his 'N. fiUformis. 



