Plate XV. 



Figs. 1 — 3. Tlcctopylis achatina, Gray, p. 217 et seq. 



1, general anatomy ; 2, jaw ; 3, different teeth of one transverse 



series. 



Figs. 4 — 6. Fleet, cyclaspis, Benson, p. 217 et seq. 

 4, genital organs ; 5, jaw ; 6, various teeth, of a series. 



ft. foot ; a, anus ; I, lungs ; mt, mantle ; rm, retractile muscle of the foot ; 

 p, penis ; oe, oral parts ; sg, salivary glands ; roe, retractor of the oral parts j 

 to, retractor of the penis ; sgl, supposed arrow glaud ; aZ, alimentary canal ; 

 rs, seminal receptacle ; li, liver ; dig, albuminous gland ; Jid, hermaphrodite duct ; 

 hg, hermapt. glaDd ; i, intestines ; st, stomach; fc, kidney; 7i, heart; pg, pig- 

 ment gland ; vd, vas deferens ; i\,t t uterus ; eg, eggs in the uterus ; pr } prostata, 

 ho } hermaphrodite opening. 



