Earth Worm. 213 



segment from the one in which the mass of the coils of the 

 gland are lodged. 



c %. Segmental organ similarly modified to c i. 



03, C4, C5. Normal segmental organs^ the opening on to the 

 exterior being usually close to the inner row of setae, and 

 in the anterior portion of each segment, though it may 

 vary considerably, and even come to lie exteriorly and 

 superiorl}^ to the outer row of locomotor spines. The 

 funnel-shaped internal opening is seen a short way from 

 the outer edge of the nerve-cord, and near the ventral 

 surface in the segment anterior to that in which the gland 

 communicates with the exterior. The coils of the posterior, 

 which is much the larger part of these organs, are connected 

 by a mesenteiy-like lamina to each other and to the disse- 

 piments of the segments. 



d. Muscle passing up from one of the ventral muscles to attach 

 itself to the capsule of the supra-oesophageal ganglia and 

 the circumjacent parts, to which it stands in the relation of 

 a powerful retractor. 



ei, 6 2, 63, 64, e ^. ' Capsulogenous glands."" These bodies 

 appear to be specially-modified and greatly-developed seti- 

 parous glands, which attain this prominence in the segments 

 connected with the essential, and with the accessory organs 

 of generation j amongst the latter of which the inner setae of 

 many segments may be reckoned, besides those here lettered 

 e I to e 5. At e 2 we see a slip of muscle passing across the 

 glandular mass, and connecting the inner with the outer row 

 of setae. Over the capsulogenous gland lettered e 4 is seen 

 the vas deferens passing forward and through the dissepi- 

 ment separating segment xi. from segment x., to end in an 

 infundibulum closely similar in form, relations, and connec- 

 tions to the more delicate tubular stalk carrying the funnel- 

 shaped ending of an ordinary segmental organ. On the 

 capsulogenous gland labelled e 5 are seen the junction of the 

 stem of a second vas deferens with the anterior one seen at 

 6 4, and the commencement of the common duct. 



/i. Outer row of setae. Each seta is secreted by a separate 

 gland, and has a separate insertion The setae of the aquatic 

 Oligochaeta are, on the contrary, ' fasciculate' in their inser- 



