138 PROCEEDIXGS OF THE ACADEMY OF [Feb., 



Glands. — The oesophagus is provided with so-called salivary glands, 

 which consist of two sets of imicellular glands, one on each side of the 

 oesophagus. The ducts from these glands pass forward separately to 

 empty into the anterior part of the oesophagus. Unicellular digestive 

 glands are found in the walls of the stomach. In the dorsal i^art of the 

 cavity of the head there are two groups of large pyriform glands, which 

 send down slender ducts to the ventral surface of the head. The func- 

 tion of these glands is unknown. 



Excretory Organs. — Nephridia. — Five pairs of nephridia are pres- 

 ent. The nephridia belonging to the posterior four pairs are simple 

 tubes of delicate structure, with a blind inner end. The anterior pair 

 are relatively large and complex organs (text fig. IV), consisting of an 

 anterior canal, representing the blind inner end of the simple type of 

 nephridium ; two large glandular bodies, connected with transverse and 

 diagonal canals, and a long duct opening on the posterior border of the 

 mouth. 



Amoeboid Cells. — Large amoeboid cells are found in the anterior part 

 of the body cavity, and also in the head cavity. Their function is 

 probably phagocytic. 



Sex Organs. — Ovary. — The ovary lies on the ventral side of the 

 alimentary canal, in the angle formed by the junction of the stomach 

 and intestine. It consists essentially of a very thin peritoneal sac, 

 to the posterior portion of which is attached a pyriform mass of oogonia, 

 forming a gonad, which lies inside of the sac. The peritoneal sac is 

 usually distended with ova, some of which were seen undergoing the 

 first maturation division. No oviduct was found. 



Conclusions. — Metamerism. — A well-marked metamerism is pres- 

 ent, expressed by the body wall and its mucous glands, the nephridia, 

 and the nervous system. The presence of five trunk metameres is 

 indicated, the most anterior of which is subdivided into two annuli. 



Cephalization. — A marked tendency to cephalization is shown by 

 the nephridia and the nervous system. 



Relationships. — The morphological evidence indicates close affinities 

 with the chaetopocl annelids. 



Literature List. 



Beneden, J. P. VAN. 1851. Notice sur un nouveau Nemertien de la cote 



d'Ostende. Bull. acad. roy. Beige, XVIII, 1. 

 . 1861. Recherches sur la faune littorale de Beleique. Mem. acnd roy 



Beige, XXXII. '^ 



BoLSius, H. 1892-3. Notice sur ranatomie de Torgane segmentaire d'Enchv- 



trseides. Anat. Am., VIII, pp. 210-215. 

 Brace, Edith M. 1901. Notes on the Nervous System of .Elosoma. Journ 



Morph., XVII, 2. 



