[15] ANNELIDS OF PROVINCETOWN, MASS. 112^ 



about one-half the width of the 10th ; from this segment the diameter is 

 nearly uniform, save that the last few segments fall off somewhat rapidly. 

 Body colorless in front; oesophagus light brown; stomach white; back 

 of the stomach the body is yellowish, or light brownish-yellow, with 

 numerous white specks. 



Length of largest specimen, 8™™. 



Greatest width, 0.5™™. 



i^umber of segments, 55. 



Low water; sand. 



GKTJBEA {Quatrefages) Claparede. 

 Grtjbea dolichopoda Marentzeller. 



Gruhea dolichopoda Marentzeller. Zur Kentniss der Adriatisclien Anneliden, p. 26, 



pi. iv, fiff. 1, 1874. 

 Gruhea tenuicirrata Webster. Annelida Cbset. of New Jersey, p. 109 (corrected in 



foot-note, p. 110, to G . dolichopoda.) 



Prof. Langerhans, in his monograph of the Syllid^ (Zeitschrift fur 

 Wissens. ZoiJl., p. 564, 1879), identifies G. doUclioimdaMARBT^TZ. with G. 

 clavata Clpd., and regards G. tenuicirrata Clpd. as a distinct species. 

 If this conclusion is based only on the descriptions and figures given 

 by Clafjar^de and Marentzeller, and not on examination of the type^ 

 specimens, it would seem hardly tenable. On the other hand, the differ- 

 ences indicated by Marentzeller between G. dolichopoda and G. tenuicir- 

 rata are very slight ; so slight that it seems probable that these forms 

 are identical. There is nothing in the text to indicate that Langerhans 

 examined specimens of G. tenuicirrata Clpd., and the differences be- 

 tween this species and G. clavata, as understood by him, refer mainly 

 to the terminal points of the compound setoe and to the position of the 

 pharyngeal tooth. As to the fine points of the seta?, Claparede's figures 

 in the Glanures are certainly not reliable; and the position of the pha- 

 ryngeal tooth was not regarded as of so much consequence when he 

 wrote his description as at the present time, wlien it is regarded not 

 only as a good, but as a sufficient, generic character, at least by Lan- 

 gerhans in his monograph (I. c, p. 526, Syllis. — , p. 541, Opisthosyl- 

 lis). It may be further noted that Langerhans gives G. clavata four 

 anal cirri, while G. dolichopoda Marentz. has but three. 



Common on stones, shells, &c., at low water. 



SPH^ROSYLLIS Claparede. 



Langerhans, in commenting on the genus Sphjerosyllis, says that 

 Claparede did not sufiiciently insist on the coalescence of the buccal 

 segment with the head. He therefore adds as one of the important 

 generic characteristics this union of head and buccal segment. The 

 species described below, from Provincetown, have the buccal segment 

 quite distinct; this is also the case with S.fortuita Webster, from Vir- 



