1903.1 OLIGOCH^TA FROM NEW ZEALAND. 221 



condition, indeed, is similar to that figured by Micliaelsen for 

 '' E. mobii" (= E. albidus). 



Dimensions. Length 15 mm. ; diameter | mm. Segments 



about 58. , ^-r IT 1 J 



Locality. Lake Taupo, North Island, New Zealand. 

 Remarks.— It seemed likely, from a preliminary examination, 

 that this species might be E. albidus Henle, which has a very 

 wide distribution ; but in the details of the more important organs 

 there appear to be sufficient differences to permit the bestowal of a 



new name. . , tt * j u 



The fitrures of the male apparatus given by Lisen* and by 

 Michaelsent show a distinct everted lip to the spermiducal 

 funnel ; the sperm-duct is not so compactly coiled in a zigzag, 

 while it may reach as far back as the eighteenth segment. 



The nephridia of E. albidus also appear to differ from these 

 organs in our species % ; while the absence of a peptonephridium 

 in*our New-Zealand worm appears to mark it off from E. albidns. 

 In possessing only 3 chsetse per bundle, it resembles E. hyali7ius 

 Eisen, and E. adriaticus Vejd. From the latter it is distin- 

 guished by the foi^m and proportions of the three regions of the 

 nephridium. With the former, however, it agrees very closely 

 in the structure of the male efferent apparatus §, but the sperma- 

 theca in that species has an " atrium-like dilatation " on its duct, 

 which is absent from the new species. The form of the nephridium 

 is also a point of agreement. But the fact that E. hyali7ms occurs 

 in Novaya Zemlya seems to exclude the possibility of its intro- 

 duction into Lake Taupo. 



AcH^TA MAORiCA, sp. n. (Plate XXV. figs. 23, 24.) 

 A single, but fortunately a mature specimen of this small worm 

 was obtained at Station 18 in Lake Manapouri. 



It Avas stained in alum-cochineal and mounted entire, and its 

 anatomy studied as far as possible. It was then unmounted, and 

 the anterior half was cut into a series of longitudinal sections, 

 and the rest of the body into transverse sections. Owing to the 

 flattening to which it had previously been subjected, the former 

 series was not very satisfactory, especially as the sections were 

 a good deal torn by the diatom- valves and dirt in the intestine. 

 Nevertheless the anatomy was sufficiently studied for systematic 



^ The jyrostomium is short, rounded, and provided with the usual 



terminal pore. , . x n ^ ^ an 



There are no ch^tigerous sacs, nor could I detect any chloro- 

 phyll-glands." 



The clitellum appears to include only segment xii., encroaching 

 but slightly into the hinder region of segment xi. 



* Eisen, Svenska Ak. Handl. (n. ser.) sv. p. 25, pi. k. fig. 18, pi. x. fig. 20. 

 t Micliaelsen, Untersuch. u. JE. mohii, 1886, p. 1, pi. m.hs-^ 

 X Goodrich, Quart. Journ. Micr. Sci. xxxix. p. 51, pi. v. fig. 2 (nephridium). 

 § Eisen, loc. cit. pi. x. fig. 20. 



