16 Prof. M'Tntosli's Xoles from the 



in the spirit-preparation. Tentacles comparatively short, 

 bluntly tapered distally. 



The body is comparatively long and slender, and the 

 example showed little diminution throughout its length, 

 having apparently been preserved in its tube and then slit 

 out. The segments are fairly distinct, those of the anterior 

 region ranging from 8-12 {Mahngren). The ventral scutes 

 of the region are distinct and undivided, and there is a 

 dorsal groove, behind which a line marks the mid-dorsal 

 region for some distance. The scutes are continued back- 

 ward on the ventral surface as a somewhat narrow pale band, 

 tlie central groove cutting the portion in each segment into 

 two. In the preparation the bristles are inconspicuous. 

 The anterior bristles are o£ two kinds — a series with slender 

 elongate shafts and short tapering tips with narrow wings, 

 and a larger number with stouter shafts and paddle-like tips 

 with broad wings and a tapering process of the axis. The 

 posterior bristles are of one kind only, viz., those with 

 narrow but distinct wings and long tapering tips. The 

 anterior hooks are avicular, with a characteristic short and 

 stout outline and a high crown, a main fang of moderate 

 size, and six or seven distinct spikes in lateral view above it. 

 The anterior prow is large and bulging, the gulf between it 

 and the great fang is small. The posterior outline is straight, 

 and a small remnant of the base posteriorly is present. The 

 posterior hooks agree in the general outline, but the process 

 of the base is absent posteriorly. It is this hook which 

 Malmgren shows in his figure, unless the Arctic species 

 differs. The tube is composed of secretion and mud, very 

 little of the latter constituent occurring on a third of the 

 length at one end. 



Bra7ichiomma vesiculosum, Montagu, the sixth species, 

 comes from various parts of the southern coasts. 



Kolliker, in 1858*, constituted the ^euns Branchiomrna 

 for those Sabellids having eyes on their branchise, and he 

 gave as a type Amphiti'ite humbijx, Dalyell. Sars, a little 

 later (1861) f, made the genus Dasi/chone, characterized by 

 the dorsal pinnules on the branchiie. Clarapede rightly 

 restricts the term Branchiomma to those havino; subterniinal 

 eyes, such as B. kollikeri, the form which Kcilliker probably 

 studied. Dorsally, the cephalic plate presents a deep fissure 

 between the firm basal pillars of the branchiae. The some- 

 what deep collar arises from the outer edge of each pillar, 



* Zeitschr. f. wiss. Zooi. lid. iv. p. 63G. 



t Vidensk. Selsk. Forliandl. 18G], pp. 28 & 33. 



