162 



MERISTIC VARIATION. 



[part I. 



103. Table shewing position of ovaries in forms having two or more 

 pairs of ovaries, and in the Variations found (slightly altered from 

 M. F. Woodward, P. Z. S., 1892): 



Segments 



A canthodrilus 



Kclipidrilus 



Eudrilus 



Lumbricus terrestris (normal) 



L. herculeus (? = teirestris) Benham's \ 1. 



2 specimens (rt. 



I., turgidus Bergh's spec, (abnorm.) 



do. do. do. (abnorm.)... J ' 



L. purpureus do. do. (abnorm.)... J .' 



AUolobophora sp. (Common Earthworm, 



abnorm.) 



Perionyx (two pairs, varying from 9 — 16).. 



Phreodrilus 



Ph reoryctes l 



Vrochceta 



16 1 17 



18 



x 



104. AUolobophora sp. [</ pores normally in 15th and $ pores in 

 14th, as in common Earthworm] : specimen having on the right 

 side £ pore in 20th and % pore in 19th ; on the left side, <£ pore in 

 17th and $ pore in 16th. Michaelsen, W., Jahrb. Hamburg, 

 wiss. Anstalt, 1890, VII. p. 8. In each case the £ pore is in the 

 segment behind the % pore, as normally. The position of ovaries 

 not given. 



105. Lumbricus agricola Hoffm. (= terrestris L.) : amongst 230 speci- 

 mens in which the position of the male pores are determined, 6 speci- 

 mens were found in which these openings were not normally placed (viz. 

 one on each side in the 15th segment). In two of these specimens, 

 both pores were in the 14th segment; in one case the left pore 

 was in the 14th segment and the right was in the 15th: these three 

 worms were German. One specimen was found in Savigny's collection 

 in Paris which had two pores on the left side [and none on the 

 right (?)]. In one English specimen the " vulva" [sc. the two male 

 pores] was in the 14th segment and in another it was in the 16th. 

 [The author speaks sometimes of both pores as the " vulva," and at 

 other times he uses this term for one pore only, but the meaning is 

 plainly that given above.] Hoffmeister, W., Uebersicht alter bis 

 jetzt bekannten Arten a. d. Familie Begenvnirmer, Braunschw., 1845, 

 p. 7. 



1 Phreoryctes, a N. Zealand Oligochast, has 2 pairs of testes and 4 vasa deferentia 

 opening separately; 2 pairs of ovaries and 4 oviducts. Beddard, F. E., Ann. and 

 May., 1888, i. p. 339, PI. 



