250 The Philippine Journal of Science 1913 



If the animal be irritated, its body contracts to the shape and size 

 of a large olive, and the proboscis is much shortened. I suc- 

 ceeded in killing specimens fairly well expanded by leaving them 

 in sea water to which a little atropin was added from time to 

 time. 



The greatest thickness of the extended body is just back of the 

 mouth, from which it tapers to a point at the posterior end. 

 The two setae are orange tipped, and are placed on the ventral 

 surface near the mouth. The body wall is tough, and the 

 longitudinal muscles are prominent. They are found in 17 or 

 18 bundles, the proportion of specimens having 18 bundles to 

 those having 17 being nearly as 5 to 1. The surface of the body 

 is covered with small papillae which are especially prominent on 

 the terminal regions, those of the posterior end being arranged 

 in more or less definite rings. 



Color. — In the living specimens the general color of the body 

 is red, with broad white stripes running lengthwise. These 

 correspond in number to the longitudinal muscles. The pro- 

 boscis is bright green on the ventral side along the edge of the 

 groove, and shades to a cream color on the dorsal surface. The 

 tip is bright yellow, and the groove is pale yellow. When the 

 circular muscles contract, the surface of the body is broken into 

 deep red squares which appear and disappear as the peristaltic 

 wave passes along the body. 



Nephridia. — AU of the specimens examined possess 3 pairs of 

 nephridial sacs, the anterior pair always opening in front of the 

 setae. Each sac bears 2 spirally coiled internal openings'. The 

 sacs are always very much elongated, in some specimens the 

 posterior sac being as long as the body; all contained eggs or 

 spermatozoa when collected. 



Anal trees. — These organs are clear transparent sacs, and 

 are about one-half the length of the body. They are covered 

 with microscopic, sessile, ciliated funnels. 



THE BODY WALL 



(FIGS. 3, 4, AND 5) 



For the purpose of description it will be necessary to divide 

 the body wall into three parts; namely, the anterior and pos- 

 terior terminal regions and the middle portion. The anterior 

 and posterior terminal regions are thickly covered with papillae, 

 and show no differentiation of the longitudinal muscle into 

 bundles. In preserved specimens they extend for about 1 cm. 

 from each end of the body. On the middle portion, the papillae 

 are smaller and scattered, and the longitudinal muscle is divided 



