NEW SPECIES OF OCNERODRILUS. 255 



inahv. The form is irregular, cylindrical, contracted in 

 several places, and with a few only slightly elevated or 

 wart-like diverticula, hardly differentiated from the main 

 pouch. In general appearance it comes nearest to that 

 of O. Beddardi, but it is smaller, and the diverticula are 

 less prominent. 



The testes are in somites x and xi, and offer no pe- 

 culiarities. The sperm-sacs are very large, and always till 

 the somites ix to xii. The sperm-sac in somite ix is situ- 

 ated as in O. Beddardi and O. agricola. It is deeply lobed 

 as in these species. The sperm-sacs in somite xii are 

 similarly situated and lobed as in the species just referred 

 to. Ovary and oviduct , as usual, respectively in somites 

 xiii and xiv. 



The cliteUum does not show the peculiar zone around 

 the male pore as in O. agricola, and the male papilla is 

 very small and not prominent. 



The inner pair of setje in somite xvii is wanting, simi- 

 larl}" as in O. agricola, Hendriei, etc. 



While all other species contain only one pair of pros- 

 tate glands, O. limicola possesses two pair, one in somite 

 xvii and one in xviii. The one in somite xvii opens in 

 the male pore, together with the sperm duct. In Gordio- 

 driliis robustus, as lately described b}' Beddard, there are 

 two prostates on each side opening in two consecutive 

 somites, but only one pair of sperm ducts, both sperm 

 ducts opening in one pore. The prostate itself is un- 

 usually narrow at the distant end, thicker at the middle, 

 and then again gradually tapering towards the muscular 

 part. This muscular part is narrowest close to the gland- 

 ular part, from which it gradually increases in size to- 

 wards the male pore (fig. 53). 



The sperm ducts are not enlarged close to the pore, as 

 in at least three other species, O . agricola, Rostr and con- 

 tractus. 



