ZooL— Vol. II.] EISEN— OLIGOCHOLIA. II5 



Septal formula: — 



vTvi, vi/vii, vn/vrn, viii/ix, fx/S, S/Sl, xi/xii. 



Diverticles of the Intestine. — The diverticles are not 

 divided by septa as in some of the other species, but possess 

 interiorly only a few more or less projecting lobes. In this 

 respect the species resembles the variety. 



Testes and Sperm-sacs. — As has been previously stated, 

 there are really two pairs of testes in X and XI, each 

 testis being directly connected with a minute, narrow 

 sperm-sac which does not extend beyond the somite of 

 the testes. The sperm-sacs project straight upwards and 

 the testes are very thin, in cross-section only one or two 

 cells thick. The sperm-sacs are simple and sac-like, cov- 

 ered by peritoneum. They are nowhere connected with 

 the septa, but appear to be simply extensions of the testes. 

 There are no racemose sperm-sacs as in most of the other 

 species. The sperm-funnels lie quite free behind the testes 

 in X and XI and do not stand in direct communication with 

 the sperm-sacs (figs. 123, 132). 



Ocnerodrilus occidentalis Eisen, sinensis, var. nov. 



Definition. — Length 25-30 mm., width i mm. Setag ab in somite XVII 

 are both absent. Sperm-ducts are separated though surrounded by a com- 

 mon muscular investment, their lumens remaining distinct till they reach the 

 pore. The muscular investment is not thicker at or near the pore. The pros- 

 tates are carried forwards (constant ?) as far as somite XIII, and show a slight 

 bulbous enlargement at the pore. Clitellum, dorsally, XIII-XX; ventrally, 

 XIV-XIX. Septal glands in V, VI and VII are of equal size; those in VIII 

 are somewhat smaller. In other respects the variety resembles the species. 



Habitat. — Several specimens collected by Mr. Alexander 

 Craw from pots containing plants brought from China, 

 The variations from the type which characterize this variety 

 are slight, but as the specimens come from China it seems 

 best to describe them as a distinct variety. The most char- 

 acteristic features, such as the absence of spermathecge and 

 the peculiar sperm-sac caps which cover the testes, in con- 

 nection with the absence of other sperm-sacs, show this 



