106 Prof. M'Tntosh's Notes from the 



shaft is finely striated longitudinally, the strire converging 

 as tlie hook narrows distally and ceasing within the tip. 



The ordinary hooks are arranged on small ridges beneath 

 the bristle-tufts anteriorly from the fourtii segment baek- 

 ■svard. The lamelhe which carry tlic hooks are at first small, 

 but by aiul by they project as small flaps with a tendency to 

 a prolongation ventrally. The hooks present a rounded 

 crown with four teeth on the front edge, increasing in size 

 from the first to the third, the fourth having a broad base, 

 but a shorter fang, since tlie gulf above the rounded prow is 

 small. The posterior margin is sinuous and the base rounded. 

 Behind the bristled region tlie lamelhe become more pro- 

 minent, and have a small papilla dorsully. 



The tube is coated w'ith grcyisii nuid and lined with tough 

 secretion. Attached externally in Norwegian examples are 

 fragments of shells, it may be iu considerable number, and 

 occasionally glol)ular arenaceous Foraminitlra with grains of 

 sand in mud^ and here and there the leaf of an alga. 



The seventh species is Melinna elisobetha, M'Intosh. 

 The specimens of this species were first obtained in Britain 

 by my mother in the stomachs of haddocks, and consequently 

 tlie external configuration was altered. The presence of the 

 san;e form in Norwegian waters (dredged by Dr. Merle 

 Norman) enables a more satisfactory description to be 

 made. 



The head and anterior region, while formed on the general 

 plan of M. cristata, have proportionally longer branchiae 

 and tentacles. The cephalic border anteriorly has a slight 

 notch and two lateral eminences, and tlie tentacular [ilate 

 and the tentacles are often pushed beyond it. The tentacles 

 are remarkably long, and the month foims a ga[)ing aperture 

 beneath them at the end of the bluntly conical region. 



The branchiaj arise from two basal processes, where they 

 are fused, and they are longer and more distinctly tapered 

 than in M. cristata. Moreover*, they do not lend themselves 

 to a transverse division into an anterior and a posterior jiair 

 as iu M. cristata. The outer and more slender branchia 

 separates readily to the base, and the next to it posteriorly 

 nearly as far, ))ut the two inner (the one in front of the 

 other) arc united for a considerable distance above the base. 

 Their arrangement, therefore, didcrs from that in M. cristata. 

 The dorsal collar stretches in the same manner as in the 

 latter but the free edges of the two dilfer, for, instead of 

 the very large, regular, conical processes of M. cristata, this 

 form has smaller conical processes, often in groups of three. 



