REPOET ON THE ANNELIDA. 
213 
lens in tlie centre of the posterior pair. The tentacular cirri are very long, the long 
posterior pair reaching to the fourteenth bristled segment. A few pigment-patches 
occur on the head and palpi. 
The buccal segment is narrow, agreeing in this respect with the succeeding one. 
The proboscis is withdrawn. The paragnathi (VII. and VIII.) of the buccal basal ring 
are in the form of a single interrupted series of very minute points, each separate bar 
appearing as a continuous streak under the lens. When more highly magnified these 
bars are seen to consist of a compact series of minute points. The lateral dorsal 
paragnathi (VI.) of the same ring form a short row of minute points in single series. 
Near the bases of the maxillae they constitute on each side an angular patch (IV.) com- 
posed of interrupted rows of the same very minute points. The median seem to be 
absent. The maxillae are translucent straw-yellow at the base, deep brown at the tip 
and edges, and have seven teeth of fair size beneath the great fang. 
The first foot is prominent, consisting of three long conical lobes, with pigment, and 
a dorsal and ventral cirrus. The second is similar, while the third shows a better 
developed setigerous division above the lower lobe. The fourth has its lobes rounded, a 
condition which is gradationally increased from the first to the fourth. The fifth, sixth, 
seventh, eighth, and ninth present large rounded lobes, especially interiorly, but this 
character is less marked in the tenth, a feature which forms a contrast with the condition 
in Nereis dumerilii. Superiorly the tenth foot (PL XXXIV. fig. 8) has a somewhat 
pointed lobe with an elevation at the base, from which the dorsal cirrus projects. The 
latter is longer than the vertical diameter of the foot. The dorsal fascicle consists of 
bristles (PL XVIa. fig. 5) similar to those in the previous species. The peculiar falcate 
forms have probably fallen out. The middle lobe of the foot is somewhat ovate, with a 
notch superiorly, and it extends almost as far outward as the superior. The inferior 
setigerous process is of considerable length, and bears superiorly a group of the spinose 
bristles and interiorly a series with short falcate processes. The inferior lobe is pedate, 
and does not reach a line from the tip of the setigerous region above. The ventral 
cirrus arises from a prominent rounded boss, and is somewhat shorter than the inferior 
lobe. 
At the thirty-seventh foot (PL XXXIV. fig. 9) a considerable change occurs. The 
dorsal cirrus is shorter, being less than the vertical diameter of the foot, while the eleva- 
tion from which it springs is more marked, and the two pigment-masses larger. The 
superior lobe is also more acute. The bristles beneath the superior setose forms are 
elongate, and have a guard or wing attached to the tip of the falcate region (PL XVIa. 
fig. 6), which is set into the end of the shaft in a peculiar manner, and there is a 
rounded body like a little bursa or cushion at the base between the articular surfaces. 
These bristles are somewhat strong, their shafts being about twice the diameter of the 
setose forms. The next lobe of the foot is about the same length, but its tip is rather 
