222 



ZONITIDJE. 



a pointed lobe overlying the narrow linear mucous gland. Shell- 

 lobes (B) ample and probably in life cover the whole shell ; they are 

 smooth and paler than the remainder of the animal; they are not 

 continuous round the back of the shell as in Austenia. Animal 

 grey or pale ruddy ochre. Jaw (D) soft and horny, straight 

 in front. Teeth very numerous ; central tooth minute, pointed ; 

 lateral teeth serrated ; minute as in S. levidensis, 



In the genitalia (C) no dart-sac ; a penis papilla (E). The 

 spermatheca is a moderately long blunt sac, attached by a short 

 stem. The retractor muscle of the penis is very strong, given off 

 where the vas deferens joins ; no trace of a kale-sac or flagellum. 



[Fig. 77. Satiella dekhanensis. 



A. Animal, view of the right and left sides, life-size, and extremity of foot 



from beneath, X 6. From spirit-specimen. 



B. Mantle-zone detached from the animal, showing shell- and dorsal lobes. 



Satiella dekhanensis, var. bicolor. 



C. Generative organs. X 3. 



D. Jaw. X 18. 



Satiella levidensis, 



E. Male organ opened out on side. X 3. 



F. Central tooth and admedians, X 276. and four admedian teeth still 



more enlarged.] 



