492 GLYCERA GOESI. 



tesselated at the sides, and the anterior end appears to be less tapered than in the 

 ordinary forms, being rounded at each side of the base of the snout. In life the body is 

 pale reddish. 



Proboscis (Plate LXV, fig. 2 a) massive and clavate, of a pale brown colour in the 

 preparations, with the four teeth in the normal position. The lateral spur of the tooth is 

 of moderate length, and has a somewhat triangular anterior crest or process, that is, it 

 projects toward the central region of the organ in extrusion (under cover of the muscles). 

 The papillae are conical, and amongst them are a few more or less globular. 



In section of the body-wall the nerve-area is wider transversely, and thus has a more 

 extensive muscular covering than in its allies. The gut has a thin muscular coat, and the 

 dorsal vessel projects freely above it, only the lower border being fixed closely to the 

 intestine. The peritoneal layer surrounds both. 



The foot is of moderate length and considerable depth, having anteriorly two 

 elongated papillae and posteriorly two slightly shorter and also pointed papillae. Dorsally 

 is a single branchial stem, whilst ventrally is the cirrus, which is somewhat lanceolate. 

 The dorsal cirrus occurs at the base of the foot. 



The typical foot (Plate LXXVI, fig. 4) of this species differs from that of Glycera 

 alba, H. Rathke, to which it is somewhat allied by the position and size of the branchia, 

 and by the fact that both posterior lobes are somewhat elongated and conical. 



The tenth foot (Plate LXXVI, fig. 4 c) has a comparatively large and slightly clavate 

 dorsal cirrus, two long anterior lobes, the upper occasionally being flattened and bifid at 

 the tip, two flattened conical posterior lobes about equal in length and considerably shorter 

 than the anterior, and a short ventral cirrus with an oblique and rather blunt tip. 



The chief difference at the twentieth foot is the slight increase of the ventral cirrus, 

 the tip of which is more pointed. 



About the thirty-second foot a papilla appears on the anterior surface, and midway 

 between the base and the tip — the first evidence of the branchia ; and in the subsequent 

 feet this develops into a conical process, of comparatively small size, which is directed 

 forward and slightly upward (Plate LXXVI, fig. 4' representing the thirty-eighth foot), 

 and it continues to the end of the body, which, however, is not quite complete. This 

 and the long dorsal cirrus give a character to the foot. As an exceptional condition one 

 branchia, the sixth after the commencement on the right side, was large (almost as long 

 as the foot), and consequently it impinged against the foot in front, and curved upward. 

 The position of the branchiae makes it difficult to see them when the feet are placed 

 vertically on a slide. 



Both dorsal (Plate LXXXV, fig. 6— dorsal) and ventral bristles (Plate LXXXV, 

 fig. 6 a — ventral) are comparatively slender and long, but there is little in their minute 

 structure to differentiate them from allied forms. 



The foot alters little in its progress backward (Plate LXXV, fig. 4b), and the 

 prominent and pointed posterior lobes are easily observed under a lens, for they are 

 usually directed backward whilst the anterior point forward. Occasionally, however, the 

 lower lobe is blunt, thus simulating the condition in Glycera alba, H. Rathke, but the 

 normal arrangement is as mentioned. In one also, whilst the lobes were of equal length, 

 the lower was the broader. 



