W. a. Coe — New Palmonemerteans. 517 



arranged with great regularity. The cell-walls and the cilia are 

 very distinct in most preparations. The intestine is without cseca, 

 although the lumen is more or less lobulated. Its epithelium is 

 made up of long columnar, ciliated cells filled with a secretion in 

 small globules, most of which contain a single deeply-stained, spheri- 

 cal granule. 



The blood-vascular system consists of two longitudinal trunks 

 (Plate XV, fig. 5, Iv^ lying on the inner side of the longitudinal mus- 

 cular layer of the body-wall, near the lateral cords. They are united 

 in front and behind. In the anterior part of the head is a single 

 large lacuna which divides into two at the anterior end of the rhyn- 

 chodseum. The lateral vessels are narrow in the cesophagal region, 

 but are commonly enlarged farther back. There are many small 

 lacunae about the oesophagus. The two nephridial canals iu) lie close 

 against the dorsal walls of the lateral blood-vessels. There is a sin- 

 gle efferent duct at the posterior end of each canal. 



The central nervous system lies between the outer circular muscular 

 layer and the basement membrane of the integument. It consists of 

 a four-lobed brain, a pair of lateral cords (^c), and a median dorsal 

 nerve. The brain-lobes are united by a dorsal and a ventral com- 

 missure, of which the former is much smaller and lies in front of the 

 latter. The dorsal nerve is well developed. It arises from the dorsal 

 commissure and may be followed well back in the intestinal region. 

 The pair of vagus nerves to supply the mouth and anterior portion 

 of the oesophagus arises from the internal borders of the ventral 

 brain-lobes, as in Cerehratulus. They lie just beneath the epithelium 

 at the sides of the mouth. The only indication of side-organs is a 

 slight modification of the epithelium on the lateral borders of the 

 dorsal brain-lobes. In some specimens there is a minute, shallow 

 pit in this situation. 



The reproductive organs develop in sacs closely packed together 

 above the lateral blood-vessels. Each sac opens to the exterior on 

 the dorso-lateral surface of the body. 



Parapolia, gen. nov. 



Body stout, cylindrical in front; intestinal region flattened. Head 

 cylindrical, directly continuous with the body ; rounded in front ; 

 without lateral, horizontal slits but provided with a pair of lateral, 

 transverse furrows near the tip. Ocelli absent in the type species. 

 Proboscis-opening sub-terminal. Mouth situated but a short dis- 

 tance farther back, altliongh it lies behind the brain. 



