1904.] 



EARTHWORMS FROM XEW ZEALAND. 



243 



apparatus of these worms, so that I will not further describe it 

 here. 



Alimentary system. — The gizzaixl is small, rounded, and hidden 

 by the extrinsic muscles of the pharynx ; it lies in segment 5. 



There are no definite oesophageal glands, but in segment 1 5 the 

 tube is dilated, and its dark vascular wall contrasts with the 

 paler wall of the neighbouring region, and here its lining is 

 thrown into a series of horizontal lamellae. 



The intestine commences in segment 16 ; there is no typhlosole. 



Reproductive system. — The testes and funnels are free and, like 

 the ovaries, lie in the iisual segments. The two pairs of sperm-sacs 

 lie in segments 9 and 12 : their wall is smooth. Further, on the 

 anterior wall of segment 13 is a minute curved sac, close to the 

 gut, whose curvatvire it follows ; it is of aboxit the same size as a 

 similar sac in the 14th segment, which I take to be the ovisac. 



Text-fi.e-. G5. 



24 



ToJcea esculenta. — An asymmetrical arrangement of the prostates, such as occa- 

 sionally occurs in some species of the genus ; V.V., ventral hlood-vessel. 



Spencer has noted in some of the Cryptodrilids studied by him 

 such an extra sac in the 13th segment, which he regards as a sperm- 

 sac. I could not discover any developing sperms by teasing this 

 sac on the slide, and I have not yet studied it in sections. I have 

 met with similar structures in some other species. 



16* 



