178 Prof. Mcintosh's Notes from the 



from the outer edge, and passes forward and outward as a 

 short conical process in the Neapolitan, but as a process 

 witli a longer filiform tip in the English examples, though 

 its condition is subject to variation. Moreover, on a long 

 papilla on the dorsal edge of the base (that is, behind the 

 external pointed papilla), a row of fine bristles projects, 

 the long axis of the tuft being from the front slightly 

 upward and backward. In structure these bristles differ 

 from the -ventral series in being comparatively stout, per- 

 fectly smooth, and with the tips apparently abraded from 

 use. 



The oral tentacles form a series of converging rows on 

 each side to the number of about twelve, but the number is 

 variable. Each basal lamella is concave in front, and the 

 filaments spring from the summit as a single row. 



In spirit the buccal region still retains deep purplish- 

 brown pigment on the sides, especially external to the 

 tentacles and between their basal folds. It is terminated on 

 each side posteriorly, as in 5. spinosa, by a fillet which has a 

 branchia dorsally and a flattened and pointed lamella with 

 a minute bristle-tuft below it ventrally, the bristles having 

 proportionally stout shafts and tapering closely spinous tips. 

 They appear to belong to the ventral series. 

 , The long dorsal bristles in the complex region of Sabellaria 

 spinulosa are thus absent, only developing paleee occurring 

 toward its anterior margin. Whether the smooth bristles 

 to the exterior of the ventral mouth-lobes represent their 

 equivalent or otherwise is at present unknown, but their 

 absence dorsally is noteworthy. Meyer's view that such 

 represents the dorsal division of the first segment of the 

 body is thus not without basis, more especially as the tuft 

 of characteristic bristles shows that the ventral division is 

 also present. The dorsal bristles seem to be well developed 

 in Pallasia murata, Allen *, the first branchia with the fillet 

 and the papilla on its anterior margin would thus appear to 

 complete the parts of the first bristled segment. 



The body is massive, rather flattened, grooved both 

 dorsally and ventrally, gently tapered, both when viewed 

 dorsally and laterally, from the anterior to the posterior end, 

 and divided into two regions, besides the long, flexible, 

 caudal tube which appears to be invariably curved ventrally 

 in the preparations. The dorsum is occupied throughout by 

 the branchise, the first three of which have broader flattened 

 bases and more slender tips than the rest — which increase 



* Joum. M. B. A. iv. 8, vol. vii. p. 301, pi. x. figs. 1 & 3. 



