222 PEOF. W. B. BENHAM ON AQUATIC [Nov. 3, 



I could not detect any "great cells," such as occur in the clitellum 

 of some species of this genus. 



The male pores are paired and situated at about the middle of 



segment xii. . , i it ^ 



The spermatheccd pores, paired, lateral, iie at the anterior 

 boundary of segment v. 



Interoial Anatomy. 



There are septal glands on the hinder septa of segments iv., v., vi., 

 and these septa are rather stouter than the rest. 



Segments vii., viii. (as indicated by their ganglia, for the external 

 boundaries are difficult to detect in the transparent worm) are 

 much shorter than their neighbours ; the tenth and following are 

 almost twice the length of either of these two. 



The dorsal vessel arises in segment x. ; but I fail to discover any 

 swellings on its course. 



The sperm-funnel occupies about half of segment xi. ; it is urn- 

 shaped, without an everted margin (PI. XXY. fig. 23), and its 

 leno-th is about equal to twice its breadth. The sperm-duct, less 

 than twice the length of funnel, takes a nearly straight course 

 backwards to about the middle of segment xii., when it bends down- 

 wards almost at right angles ; it is dilated after passing through 

 the septum xi./xii., but it soon narrows again, and the external 

 opening is surrounded by a small lens-shaped mass of glandular 

 cells (spermiducal gland), which it perforates at about the centre. 



Loose masses of developing spermatozoa occur in the body-cavity 

 of segments ix. and x., and a few even in segment viii. 



The spermaiheca is much elongated (PL XXY. fig. 24) ; its aper- 

 ture (surrounded by a group of gland-cells) leads by a short canal 

 into an ovoid dilated sac lying in segment v., thence a narrow canal 

 passing through segments vi., vii. begins to enlarge after passing 

 through the septum vii./viii. to form a large " ampulla " lying in 

 segments ix. and x., which is constricted at about its middle. 

 The ampulla contains bunches of ripe spermatozoa. 



The ovary and dtict have the usual positions, and the body-cavity 

 of segment xii. is fully occupied by a couple (or more) of large eggs, 

 which distend the body. 



Dimensions. Length 4 mm. ; breadth very small, ISTumber of 

 segments 22, with an anal segment. 



Locality. Lake Manapouri, South Island, New Zealand. 



Remarks. — This species agrees with A. (Anachceta) cameranoi 

 Cognetti* in its smaller size and in the total absence of cheetigerous 

 follicles, but in nothing else ; for its spermatheca somewhat resembles 

 that figured by Vejdovsky (Syst. u. Morph. pi. vii. fig. 22) and 

 labelled A . eisenii, but which Beddard f suggests really belongs to 

 A. hohemica. But in the point of origin of the dorsal vessel it 

 differs from each of these species. 



Having only a single preserved specimen, I am unable to give 



* Cognetti, Boll. Mus. Zool. Aiiat. Comp. Torino, xiv. 1899, no. 354. 

 f Befldard, ' Monogi-apli,' p. 356. 



