68 ANNELIDS. I. 



On the ventral side the parapodia are limited against the body by a very deep and sharply 

 pointed furrow. This furrow is present throughout the whole length of the animal, and only in the foremost 

 part of the body, near the head, does it grow more indistinct and successively more flattened. The ventral 

 side of the animal is highly convex; but in the middle of this ventral convexity a broad and deep 

 longitudinal furrow is present, so that the ventral side presents two parallel-running longitudinal walls 

 separated from each other by the named longitudinal furrow. Towards the front end of the animal this 

 furrow also becomes more shallow and tapers successively in the foremost segments; yet a limited 

 ventral part can be seen even here (PI. VI. fig. i). On the dorsal side of each segment a pair of in- 

 distinct pores is to be seen; they form two longitudinal rows of pores stretching along the dorsal 

 side of the animal. In the front part of the animal the named pores are invisible; it is undecided 

 whether they are reallv wanting here or whether they can not be seen on account of the fact that 

 the skin here is more strongly folded and wrinkled than in the other parts of the body. 



On the dorsal side the skin is finely wrinkled; the furrows and the wrinkles are running in 

 the longitudinal axis of the animal; as already remarked, this system of furrows and wrinkles becomes 

 more distinct in the front end of the animal. In the parapodia these furrows are highly distinct (PI. 

 VI. figs. 9 and 5). 



On the ventral side a system of longitudinal and across-running wrinkles is distinct on the two 

 ventral longitudinal walls (PI. VI. fig. 11). In the ventral furrow the skin is only furrowed transversally. 



The cephalic lobe is rather large, of equal length and breadth, c. 2 mm; its longitudinal axis 

 is situated about right-angled to the axis of the body. The ventral part of the cephalic lobe constitutes 

 a broad, thick, wrinkled, convex shape which bounds the mouth dorsally and overhangs the latter. (PL 

 VI., figs. 1, 4, 8.) The named wrinkles, running longitudinally and restricted to this part of the lobe, are of 

 different distinctness; the median furrow is larger and deeper than the others and divides the lobe in 

 two lateral halves. (PL VI. figs. 1 and 4). Near the base of the cephalic lobe are situated two tentac- 

 les, on the dorsal side short, broad and somewhat flattened, almost conical in shape and somewhat 

 restricted at their base. Between these two tentacles is seen, in the dorsal midline of the cephalic 

 lobe, a similar but conspicuously smaller tentacle-like prominence. Whether this organ is a true tent- 

 acle or not is undecided; it is possible that it is a nuchal organ like those found in Phylladocids. I 

 am most inclined to interpret it as a tentacle on account of its shape, which is more like the two 

 paired tentacles than the usual globular shape of the mentioned nuchal organs. No eyes are to be seen. 



Only a very little part of the pharynx is protruded. On fig. 1 PL VI. it is seen strongly folded 

 in a rather regular manner, the folds running like radii towards the opening of the mouth. No jaws 

 or paragnaths are present: the opened pharynx only shows longitudinal folds. 



On the buccal segment two cirriteutaculares are seen on each side; they are of about the same 

 shape as the tentacles and of about the same size. The following segment has no parapodium, only 

 a cirrus (dorsal cirrus?) is present. Hereafter each segment is provided with a well developed parap- 

 odium. Those nearest the front end are smaller, but they increase rapidly backwards. 



The parapodium seems to me to ressemble in structure that of the Phyllodocidre. If we could 

 imagine the base of the Phyllodoce-parapodium lengthened to such a degree that the bristle-carrying 

 part and the lamellae were placed on the tip of a long shaft, we should have the case present in 



