THl'] OLIGOCH^TA OF NATAL AND ZULULAND. 425 



Spermathecal pores are inconspicuous ; they are in groups 

 of about ten to thirteen in the furrows between the thirteenth 

 and fourteenth segments and the fourteenth and fifteenth 

 segments. They occur ventro-laterally between the lines of 

 seta3 b and c. 



Internal Anatomy. — The septa between segments 4-5, 

 7-8 and 8-9 are extraordinarily strong, while those between 

 5-6 and 6-7 are very tender, if not quite rudimentary or 

 absent. Septum between ninth and tenth segments and all 

 the following septa are tender and thin. 



Alimentary Canal. — There is a very large gizzard in 

 the seventh segment. A pair of nearly globular calciferous 

 glands spring laterally from the oesophagus in the ninth and 

 tenth segments. The tender septum between the ninth and 

 tenth segments seemed to be fixed to the middle zone of the 

 calciferous glands. 



Circulatory System. — Dorsal blood-vessel simple; the 

 last heart is in the eleventh segment. 



Reproductive System. — Male organs: there are two 

 pairs of large glittering spermiducal funnels in the tenth and 

 eleventh segments ; each pair is enclosed in a median 

 transverse seminal vesicle. The lateral ends of the seminal 

 vesicles are prolonged into sperm-sacs which project into the 

 eleventh and twelfth segments respectively. 



SpermathecEe are in four groups of about eleven each, and 

 are totally embedded in the thick body-wall ; they may be 

 seen shining through the semi-pellucid wall. The spermathec^ 

 are elongated, being 0"3-0*7 mm. in length and 0*09 mm. in 

 diameter ; they open to the exterior by a very thin and short 

 duct. 



Sexual setae : the ventral sette of fifteenth to twenty-first 

 segments are enlarged and transformed into sexual set^e. 

 They are about 2i-o mm. in length, that is, about five or six 

 times longer than the ordinary seti». At the proximal end 

 they have a thickness of about 60 ju, which diminishes to 

 about 45 fx at the middle of the setas. The sexual seta? are 

 distinctly bent at the proximal end, while distally they are 



