LANICE CONCHILEGA. 141 



which extend from the lower lip almost to the termination of the bristles. The glandular 

 surface is divided into rings by transverse furrows, generally two in each body-segment. 

 Posteriorly it becomes narrow and ends in the median groove about the last bristle-bundle. 

 Besides, a glandular belt occurs at each side in the line of the bristles, after the 

 manner of the corresponding belt in the Maldanidaa, and it is continued backward 

 considerably behind the bristles. 



Immediately within the lips is a rugose internal surface, then a membranous fold 

 slightly posterior to a line drawn between the third branchiae. 



The oesophagus (a, Plate CXIX, fig. 8 a) is pale, of considerable length, and termi- 

 nates in an enlarged region (stomach) posteriorly. At this point is an elongated glandular 

 organ,/, which commences in front as a double duct with fatty granules and yellow 

 pigment, and enters the alimentary canal dorsally at the termination of the oesophagus. 

 The sac in spirit is filled with a whitish pulpy secretion. In some it appeared to have 

 two ducts opening into opposite sides of the tract. The duct seems to run a short 

 distance along the muscular coat before entering the canal, as in the case of the human 

 gall-bladder. Behind the foregoing is a delicate membranous region, g, somewhat wide 

 in calibre, and containing fatty flakes, followed by h, which has a tesselated yellowish 

 appearance from the chloragogenous coat. Then comes % a rounded, muscular portion 

 of the gut, and m, the intestine, marked by longitudinal lines ending in the terminal vent. 



The microscopic appearances of the intestinal tract at g and h do not indicate much 

 difference in function. Dr. Williams thought the anterior region had a salivary function, 

 but he does not allude to the long caecum,/. The smooth muscular portion, i, has a 

 glandular lining of columnar cells closely arranged. The external wall of this part 

 consists of a mass of non-striated muscular fibres, circular and longitudinal. 



In front the ventral wall of the body is covered with a dense series of glands, h, 

 secreting the mucus for the tube, and the five segmental organs, e, which have a clavate 

 outline. They are filled with granules of various sizes. Each is connected with a tough 

 thread emerging from the glandular masses on the ventral surface of the cavity. The 

 ventral blood-vessel, %), lies below the gut, and a branch, probably from the dorsal, runs 

 down the middle of the region in front of the oesophageal collar. Two detached glandular 

 pinkish bodies, o, hang by their ends to the body-wall about the posterior third, and 

 apparently send ducts backward— indeed, a double glandular structure seems to 

 extend to the posterior end. The contents are minute granules. Here and there the 

 glandular structures are connected by a finely reticulated network of vessels with curved, 

 fusiform pinkish sacs attached by the ends to the wall of the body. 



The intestine behind the muscular portion is marked externally by yellowish striae 

 apparently of a fatty nature, and these peel off readily like similar tissue in the muscular 

 region of the intestine. 



The first segment is very narrow, and is enveloped laterally by the free collar of 

 the next segment. It bears the first pair of branchiae, and forms a narrow rim in front 

 of the glandular ventral shields. The next has a greatly developed anterior lamella 

 or collar which stretches from the edge of the ventral shield almost to the second 

 branchia, thus forming the second process of this kind on each side. The following 

 segment has the third branchia and the first bristle-tuft, but bears no hooks. The bristles 



