162 



MEEISTIC 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 



Eclipidrilus 



Eudrilus 



Lumbricus terrestris (normal) 



L. herculeus (? — terrestris) Benham's \ 1. 



2 specimens jrt. 



L. turgidw Bergh's spec, (abnorm.) 



do. do. do. (abnorm.)... j .' 



L. purpiireus do. do. (abnorm.)... \.' 



Allolobophora sp. (Common Earthworm, 



abnorm.) 



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



Pltreodrilits 



Ph reoryc tes 1 



Urochceta 



10 11 



12 13 14 , 15 ! 16 17 18 



104. Allolobophora sp. [</ pores normally in loth and $ pores in 

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

 side <f 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, vn. 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 Hoflm. (= 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 Regenwurmer, Braunschw., 1845, 

 p. 7. 



1 Phreoryetes, a N. Zealand Oligochat, has 2 pairs of testes and 4 vasa defereutia 

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

 Ma:/., 1888, i. p. 339, PL 



