APPENDIX A 157 



— Tubercles prominent, numerous (5-9 longitudinal 

 rows), smooth, conical, black or dark brown; general 

 colour dark yellowish brown. H. papillata Moore 1 906 



[G. fusca (Castle) part] 



15. Body of firm consistency; crop with 6 pairs of lateral 

 diverticula (the anterior ones may collapse when 

 empty); eyes normally 3 pairs but some fusion may 

 take place. Glossiphonia Johnson 1816 16 



— Body of soft consistency; crop with 7 pairs of lateral 

 diverticula; eyes, 3, 2 or 1 pairs. 



Batracohdella Viguier 1879 17 



16. Adults at rest more than 15 mm long; prominent dorsal 

 tubercles usually present; eyes in 2 longitudinal rows 

 but variable in number and extent of fusion (Fig. 8) ; 

 gonopores separated by 2 annuli; 10 pairs of testes; 

 patterned with brown, yellow or green. 



Glossiphonia complanata (L.) 



Fig. 9. Head of Glossiphonia heteroclita. 



— Adults at rest less than 1 5 mm long ; no dorsal tubercles ; 

 first pair of eyes closer together than the others (Fig. 9) ; 

 gonopores united; 6 pairs of testes; colour uniform 

 amber or whitish with median dorsal brown pigment. 



Glossiphonia heteroclita (L.) 



17. European species 18 



— American species 19 



18. Large and distinct tubercles present dorsally (Fig. 10); 



isl 



^ 



Fig. 10. Part of the dorsal surface of Batracohdella verrucata 



showing tubercles. 



