ABIOPHANTA. 



27 



are well developed, the left (right in sinistral forms) divided into 

 two fa large anterior and a much smaller posterior; m the 

 dextral forms, type solata, the left dorsal lobe is continuous, or a 

 mere slit divides it into two as in hasUen.s'}. 



In the genitalia there is a kale-sac, often of large size, \\ hich 

 receives the vas deferens ; a simple diverticulum or cteciim, varying 



f't^.f 



rpi„ 17 _ \. Ariaphanta lavipes. Jaw and teeth of the radulfi, X 300. 



'' B. Ariophantri immerifa. Jaw and teeth of radula, X Ifw; and niimtle- 



ed^e, viewed from tlie outside and from below, sliowing the 

 dorsal lobes, X 3. 



pvs. Parietal side of visceral sac. 

 .s^. Shell-lobe. 

 pc. Pulmonary cavity] 



anf.nll. Anterior right dorsal lobe. 

 post. nil. Posterior right dorsal lobe. 

 idl. Left dorsal lobe. 

 res.ap. Respiratory a))erture. 



in length, leads from the junction of the kale-sac and penis-sheath 

 to the retractor muscle ; the amatorial organ or dart-sac is long 

 and more or less cylindrical ; the spermatheca (receptaculura 

 seminis) is small, globose, and either sessile or with a short stalk. 

 Radula broad, with numerous teeth in each row : rhachidian 

 (central) tooth tricuspid, the side cusps small and basal ; the inner 

 laterals broad, hi- or tricuspid, forming a hand of varying width 

 down the middle of the radula, distinct from the area occupied by 

 the outer laterals, which are elongate and uni- or bicuspid and 



