100 GASTROPODA. 



**** Gills in a single row on each side : 



E. despecta. 



'4^i^ 



^T- 



131 132 



• 



Fio7ia (Alder and Hancoclv). Lengthened; ten- 

 tacles four, all linear ; gills clothing irregularly an 

 expansion on the sides, and meeting behind ; each 

 papilla with a fringe along its inner side. 



F. nobilis. Fig. 132 ; In.s. 



Embletonia (Alder and Hancock). Tentacles 

 two, simple ; gills cylindrical, arranged in a single 

 row on each side ; head produced into a flat rounded 

 lobe on each side. 



E. pulchra. Fig. 133 ; f . 

 minuta. 

 pallida. 



Frocto7iotus (Alder and Hancock). Oblong, flat- 

 tened, pointed behind; head covered with a crescent- 

 shaped veil ; gills ovate, placed along a ridge on 

 each side, and round the head in front ; vent on 

 the back. 



P. mucroniferus. Fig. 134 ; f. 



