CH. l] EARTHWORMS AND LEECHES 43 



H. (A.} georgii (Mchlsn.). Colourless. Prostomium extends about 



1 across 1st segment. Clitellum from 28th or 29th to 35th. 

 Tubercula pubertatis on 31st and 33rd. First dorsal pore 

 between 4th and 5th. Total segments 105 to 110. Length 24 

 to 29 mm. Thickness 2'5 mm. Ireland. 



H. (A.) caliginosus (Sav.). Colour very variable, but not purple. 

 Prostomium as in H. georgii. Clitellum saddle-shaped, from 

 27th or 28th to 34th or 35th. Tubercula pubertatis on 31st 

 and 33rd, or confluent from 31st to 33rd. Genital setae on 

 9th, 10th and llth. Vesiculae seminales in 9th and 10th 

 small. First dorsal pore between 9th and 10th, or rarely 8th 

 and 9th. Total segments 104 to 248. Length 60 to 160 mm. 

 Thickness 4 to 5 mm. In cultivated soil. 



H. (A.) longus (Tide.), (A. terrestris Rosa). Smoky grey, iri- 

 descent. Prostomium as in preceding. Clitellum from 27th 

 or 28th to 35th. Tubercula pubertatis from 32nd to 34th. 

 Genital seise on 9th, 10th, llth, 31st, 33rd and 34th: those 

 on last 3 named on distinct papillae. Vesiculae seminales of 

 9th and 10th small. First dorsal pore between 12th and 13th. 

 Total segments 160 to 200. Length 120 to 160 mm. Thick- 

 ness 6 to 8 mm. In cultivated soil. 



H. (A.} chloroticus (Sav.). Colour variable, yellow, green, reddish. 

 Prostomium extends across first segment. Clitellum ge- 

 nerally from 29th to 37th, rarely from 28th. Tubercula 

 pubertatis small, on 31st, 33rd, 35th. Spermathecae 3 pairs, 

 between 8th and 9th, 9th and 10th, 10th and llth. First 

 dorsal pore between 4th and 5th. Total segments 80 to 125. 

 Length 50 to 70 mm. Thickness 4 to 5 mm. 



subgenus Dendrobcena Eisen, em. Rosa. Skin generally pigmented 

 red. Prostomium generally extends into 1st segment, some- 

 times reaches across to touch furrow between 1st and 2nd. 

 Setae widely paired, or not paired. Spermathecae 2 pairs, 

 between 9th and 10th, and 10th and llth: occasionally 1 or 



2 more pairs on neighbouring segments. Vesiculae seminales 



3 pairs, in 9th, llth and 12th; a 4th very small pair in 10th 

 in species with widely paired setae. 



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UNIVERSITY 

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