Neiv Species of Earthworm. 309 



In segments seventeen, nineteen, twenty, twenty-one and twenty- 

 iwo, there are additional glandular structures associated with 

 Avhich are even smaller glands. Tlie detailed structure of these 

 masses of cells is difficult to determine, but apparently each con- 

 sists of a large number of very granulated, irregularly-shaped and 

 large cells, collected together. Here and there are smaller and 

 non-granular cells arranged in groups. 



There does not appear to be a definite duct, but passing from 

 the grandular SAvelling are numerous small darker cells arranged in 

 .clusters, and these follow a disjointed passage through the thick 

 muscular wall. 



Prohleinatic Gland in the Thirteenth Segment. 



Still another peculiar structure is to be found from dissection, 

 .although no indication of its presence is given upon external 

 -examination. Attached to the anterior septum of segment thirteen, 

 somewhat ventrally, is a pair of cluVshaped organs, each slightly 

 smaller than the smallest spermathecea. 



In the less matured specimens examined there were three pairs 

 of these glands — one in each of segments thirteen, twelve and 

 -eleven. 



At this early stage there is practically no development of the 

 reproductive system, and this fact seems to render it difficult to 

 state definitely, whether these organs are or are not connected with 

 reproduction. From longitudinal and transverse sections of the 

 Avhole structure there appears to be no definite duct. The most 

 striking features about the organ is the very abundant blood 

 supply, the presence of definitely radiating groups of elements, 

 .and the occurrence of numerous spaces in the interior. 



Beyond these points, there seems to be little else to notice, and 

 it is difficult to suggest what is the function of these organs. 



In conclusion, I wish to thank both Professor Sir Baldwin Spen- 

 cer ajid Doctor Georgina Sweet for their valuable assistance and 

 jnany helpful suggestions during the progress of my work. 



EXPLANATION OF REFERENCE LETTERS. 



Ace. Glds. - - - - Accessory glands. 



Ace. Op. - - - - Opening of accessory glands. 



Bid. - . . - - Blood. 



r;.v. - - - - - Blood vessel. 



H.W. - - - - - ]k)dy wall. 



17a 



