PLATE XII. 



[Part ll.—Jtaij 1882.] 



Fig. 1. Geomalacus maculosus, Allman : side view of extremity of foot, with mucous 

 gland, from spirit-specimen, a, view from behind, ditto. 



2. Ditto : shell, x 7. 



3. Ditto : jaw, X 20. 



4. Ditto: teeth of radula, x3G0. 4 a. 12th to 18th ; 4 6. Outermost laterals. 



5. Ditto : generative organs, x 2. 



6. Ditto: ditto, portion of, from second specimen. Male organ. 



7. Ditto : the basal portion of male organ, laid open. Gen.Ap., position of generative 



aperture ; the external opening is on the other side. 



8. Ditto : position of renal organ, heart, and the retractor muscles, viewed from 



below, x3. 



9. Arion ATER. Reigate. Position of above organs, similar view, x2. 



10. LiMAX AGRESTis, Mullcr : ditto, ditto, x 3. M.f., mantle, frontal edge; M.I., 

 mantle, left margin ; r.m.O., T., P., retractor-muscle attachments of odontophore, 

 eye-tentacle, and penis; s, position of apex of shell. 



