Oatty Marine Laboratory, St. Andrews. Ill 



feature in a more pronounced manner, the tips arc shorter, 

 the teeth at the tip are longer, less curved, and show the 

 effects of friction. The developing palese in the tissues 

 have the teeth connected hy a membrane. 



The second row, which is nearly horizontal, consists of 

 palese with an outline resembling a large heavy foot (the 

 blade) and a slender tapering leg (the shaft), the heel being 

 comparatively small. The double outline on the part repre- 

 senting the sole is less marked than in Sabellaria spinulosa, 

 and this outline is nearly straight, the opposite one being 

 slightly convex. Both slope a little toward the blunt tip, 

 which is often frayed. The flattened tip is crossed by trans- 

 verse striae, and the tips of the blades touch the bases of the 

 outer palese and form a very regular second row, the two 

 sides making an ovoid area. 



The inner or third row of the pale golden palese forms an 

 oblique palisade, which leaves only a narrow ellipse between 

 them, and in lateral view, in Neapolitan examples especially, 

 the palisade shows a high dorsal margin and diminishes 

 gradually to the ventral edge. The typical palca has a long, 

 flattened, tapering terminal blade, from which the shaft 

 passes off at an oblique angle and tapers to a point, the heel 

 or shoulder being at the front edge, the outline of which is 

 very slightly concave, and with serrations on the margin. 

 The dorsal outline presents a slight convexity in the region 

 corresponding to the arch of the foot. The transverse or 

 slightly oblique striae pass from the inner outline to the free 

 edge where the notches are. The rest of the tip is longi- 

 tudinally striated. 



The dorsal arch of the mouth is of a deep purplish-brown 

 hue, and it passes backward till it meets with a buccal collar 

 which joins its fellow of the opposite side ventrally in a 

 slightly spout-shaped margin. From the dorsal edge of 

 this collar springs a tapering buccal tentacle on each side. 

 External to this collar ventrally another dark brownish- 

 purple and frilled lamella, considerably thinner than the 

 former, extends to meet that of the opposite side, so as to form 

 another spout-shaped process — as it were, ensheathing the 

 former, and connected externally with the inner base of the 

 bifid organ which guards the spout-shaped aperture ventrally. 

 The bifid organ springs by a broad base from the peristomial 

 region, the massive and larger division curving inward to 

 meet its fellow in front of the external spout-shaped aperture, 

 the chink of which is observed between them. The anterior 

 end of each is blunt and rounded, and the dorsal surface is 

 tinted brownish. The other process springs about midway 



