82 MR W. TURNER AND DR H. S. WILSON OIT THE 



tegument, by which it is divided into four segments. These external depressions 

 correspond to folds which project into the visceral cavity, and to which powerful 

 muscles are connected. When these muscles are contracting, the segmentation is 

 more manifest. The first segment lies immediately behind the roots of the long 

 arms, and possesses on each side a bulging, corresponding in appearance, but smaller, 

 to the eye-like spot on the cephalo-thorax, already described. The third segment 

 has a similar pair of protuberances, placed, however, more on the ventral surface. 

 The fourth segment is as large, or even larger than the conjoined first three seg- 

 ments. In the median line of its ventral surface, close to the posterior margin, is 

 the longitudinal slit-like anal aperture. This opening is bounded on each side 

 by a well-marked fold of integument (fig. 12, a). Attached to the outer aspect 

 of each fold is an elongated cylindrical process, which projects downwards, and is 

 slightly curved It is a little broader at the free than the attached end. Each 

 of these posterior abdominal appendages is t o ths of an inch long. Two elongated 

 ova strings project also fi-om the ventral surface. They spring from it posterior 

 and external to the anus. 



The intestinal canal lies in the axis of the cavity of the abdomen. It is 

 retained in its position by numerous delicate bands, which pass from it to various 

 pai'ts of the inner surface of the wall of the cavity. It is of almost uniform 

 calibre throughout, and presents a crenulated appearance. Distinct muscular 

 fibres, arranged longitudinally and circularly, enter into the formation of its wall. 

 It terminates posteriorly in the slit-like anal aperture. At the anterior end of 

 the abdomen the canal bends, so as to pass into the cephalo-thorax, along the 

 axis of which it extends. It makes a slight bend towards the dorsal aspect of 

 the anterior extremity of the cephalo-thorax, so as to open at the oral aperture. 

 The canal is more dilated in the cephalo-thorax than in the abdomen. It com- 

 municates with the buccal chamber, not by a broad expanded opening, but 

 through a chink-like fissure, between two plates of chitine. 



Lying in the visceral chamber external to the alimentary canal, is a quantity 

 of what appears to the naked eye to be merely brown granular material. From 

 its position, colour, and general appearance, it probably represents the liver in 

 this creature. When highly magnified, it looked lilie gland tissue, for it con- 

 sisted of vesicular dilatations, or saccules, apparently containing cells and granules. 

 Special collections of a similar gland-like substance are to be seen at the roots of 

 the arms, and extending for some distance along their central canals, in the eye- 

 like spots, the lateral dilatations of the abdomen, and the posterior abdominal 

 appendages. 



The ovaries, two in number, are situated in the abdominal cavity, and are con- 

 fined to the fourth segment. Hiey lie on each side of the intestine. Each consists 

 of a ramified system of tubes, which communicate with a duct. This duct runs 

 almost parallel to the intestine. It opens on the ventral aspect of the fourth seg- 



