Benham. — On New Species of Earthworms. 285 



structure just described may, for convenience, be termed a 

 "spermatic ridge," and we meet with it in other species of 

 this genus. 



The oviducal pores are close together in front of the 

 ventral gap, enclosed in a definite pale oval patch. 



The spermathecal pores are in line with chsetae c and d. 

 On the ventral surface of each of the segments 9 and 10 is a 

 pair of copulatory tubercles, and indications of another pair on 

 the 11th segment. 



Dorsal pores are distinct from the clitellum backwards. 



Internal Anatomy. 



The six septa, behind segments 10 to 15, are especially 

 stout, and the two in front of these less so. 



The dorsal vessel is double right up to the pharynx, being 

 connected only at the septa. The hearts are in segments 10, 

 11, 12, and 13. 



Alimentary System. — The gizzard lies partly in the 6th 

 but chiefly in the 7th segment, the septum, 6/7, being inserted 

 on its walls. The oesophagus is dilated in segment 15 to 

 form, apparently, a gland, though it is not well defined ex- 

 ternally. The lining of the oesophagus as it passes through 

 segments 12 to 15 is raised up into numerous closely set, 

 laterally flattened vascular villi, but no distinct lamellae such 

 as are usually associated with an oesophageal gland occur. 

 In the 16th segment the gut becomes paler and diminishes in 

 size, and does not become dilated to form the intestine till 

 segment 20 is reached, after which it is deeply constricted as 

 it passes through the septa. 



The worm is micronephric, the excretory organ being 

 represented in each segment by a vertical series of small tufts 

 of tubules passing upwards along the body-wall. 



Reproductive System. — The testes, ovaries, and their ducts 

 have the usual position. There are four pairs of sperm-sacs, 

 lying in segments 9, 10, 11, and 12. The spermiducal glands 

 are confined to their proper segments. The glandular part, 

 tubular as usual, is convoluted and coiled into a ball. The 

 muscular duct is long, very narrow, and undulating. 



No penial chaetae appear on dissection. Transverse 

 muscles are well developed in segment 18 and partly in the 

 neighbouring segments. 



The ovaries are noticeably large, passing along the 

 septum from near the ventral vessel upwards for nearly 

 one-third the semi-circumference of the septum. The funnels 

 of the oviducts are also unusually prominent. 



The spermatheccb are large ovoid sacs, with short ducts. 

 The duct of each sac is beset with groups of small somewhat 

 botryoidal diverticula, so that when viewed from above they 

 appear as a fringe round its neck. 



