Gatti) Marine Laboratory y St. Andrews. -iO 



to the eighth segment, which it cuts ohhqiuly as it goes to 

 the right, and ends vcntrally about the middle of tlie ninth. 

 In some, traces of the median groove are found beliind the 

 slope to the right in the eighth segment. It is of a dull 

 orange hue throughout, or in some pale, though in the 

 Zetlaudic specimens a distinct white ring went entirely 

 round the body in front of tiie third segment-junction. 

 Montagu mentions that the body is "of an orange colour 

 annulated with whitish.'' The number of segments varies, 

 for Montagu gives the large southern form of 8 or 10 inches 

 in length no less than one hundred and fifty to one hundred 

 and sixty segments, whereas the smaller Zetlaudic e.\anij)les 

 (of 2 or 2h inches) had but forty-Hve to fifty-two. Tlie 

 segments are distinct, but little differentiated doi'sally and 

 veutrally, and therein differing from the ordinary Sabellids, 

 but they often show one or more rings — especially one veu- 

 trally near the posterior border, and in some examples a 

 slight peak occur:; at the posterior border of each near the 

 posterior third. The segments become narrow at the tapering 

 posterior cud, and terminate in a median anus at the some- 

 what blunt tip. 



The vascular system contains greenish blood, and is similar 

 in arrangement to that of the Sabellids {Clapcu'ede). This 

 author holds that a contractile sinus envelops the intestine, 

 and he is probably right. Contrary to the view of Ue Quatre- 

 fages, Claparede states that the nerve-cords, doulde in front, 

 are not separated behind, but form a single cord with a large 

 neural canal (his " fibre tubulaire"), and in certain sections 

 that canal has a larger area than the nerve-tissue, wdiich 

 would seem to show that the term " neural canal" (187U) is 

 not out of place. 



The anterior region has eight bundles of bristles, which 

 are of uniform structure, viz., they have long, straight, 

 slender, cylindrical shafts, and finely tapered though rather 

 short tips slightly bent backward, and with narrow wings. 

 In rear of the fascicles of bristles Claparede (1870) mentions 

 the occurrence of minute ocular spots, formed of a crystalline 

 body surrounded by pigment. This has not been observed 

 in the preparations. Posteriorly the translucent bristles 

 are both more minute and more slender, and the shafts are 

 tapered toward the tip, which lu\s a curvature as in front 

 and a trace of a wing on each side. The forward projection 

 of the prow approaches that of the Polycinids, but the great 

 size of the secondary tooth differs. 



The anterior region veutrally has groups of about eight 

 long crotchets, which in general outline somewhat resemble 

 Ann. cO Mag. N. Hist. Ser. S. Vol. xvii. -i 



