GODWrN-AUSTEN : PAKYPHANTA. 9 



more or less perfect shell -like forin to the slug-like as in the Zonitidoe, 

 or the reverse, it is not so easy to determine. 



EXPLANATION OF FIGURES ON PLATE I. 



Fig. 1. — Animal oi Pari/phanta Bnsbi/i ; J/, edge of mantle ; ^cs. Or. respiratory 

 orifice ; r. n. I. right neck lobe ; l. n. I. left neck lobe ; a. n. I. ante- 

 rior neck lobe ; p. n. I. posterior neck lobe ; s. sole of foot. 

 2. — Sole of foot, spirit specimen. 

 3. — Do. magnified. 

 4. — Upper surface, near edge of foot. 

 5.— Buccal mass, side view. 

 6. — Central teeth of radula x 90. 

 7. — Lingual cartilages exposed. 

 8. — Radula seen from the front, contracted. 



9. — Showing the radula and its powerful posterior retra/itor muscles ; m. 



mouth ; ces. oesophagus,; Sal. g. salivary gland ; Sal. d. salivary 



duct ; i. intestine ; i. m. and i. m. B. retractor muscles of the Buccal 



mass ; /. c. lingual cartilage ; m. s. muscular sheath. 



10, IL — Generative organs. F. male organ; sp. Spermatheca ; v. d. vas 



deferens ; ov. oviduct ; r. m. retractor muscle. 

 12. — Portion of the male organ enlarged and interior exposed. 

 13. — Spermatheca much enlarged and showing the internal wall. 

 H. — Buccal mass of Trsfacella with salivary glands, etc., viewed from left side. 

 15. — Do, showing muscle attachments to shell. 

 16. — Generative organs of Testacella, sp. (^ maugei) x 2. 

 17. — Outline of Testacella, upper surface. 

 18. — lb. under side x muscle attachment of eye tentacles. 



