Plate XIX. 



Figs. 1 — 4 and 7 — 9. Sophina calias, Benson, p. 255. 



1, general anatomy; 2, genital organs; 3, Sa, jaws; 4, a few 

 teeth of a transverse series, the 5th and 14th tooth shewn in a 

 lateral view ; 7, typical specimen, front, side and upper views ; 

 8, var. schistostelis, same views; 9, a specimen with irregularly 

 thickened peristome. 



Fig. 10. Sophina foralilis, Benson, p. 257. 



10a, the front view, is enlarged twice the natural size. 



Figs. 5, 11, 12, Sophina discoidalis, Stol., p. 258. 



5, jaw ; 11, a much depressed specimen, natural size ; 12, a some- 

 what elevated specimen; figs. 12a, 12 h, 12c, are enlarged. 



Figs. 6 and 13. Sophina conjungens, Stol., p. 259. 



6, jaw; 13, different views in natural size. 



oe, oral parts ; t, tentacles ; ep, eye-pedicles ; a, anus ; M, kidney duct j 

 mt, mantle : Iml, left shell lobe ; rml, right shell lobe ; sg, salivary glands ; 

 n, ganglion ; ao, aorta with the branches lh and bg ; st, stomach ; 7c, kidney ; 

 h, heart ; I, lungs ; r, rectum ; w, retractor ; cp, calciferous sac ; vd } seminal 

 duct ; rs, seminal receptacle ; p, penis ; gs, amatorial gland ; ho, hermaphrodite 

 opening ; pr, prostata ; ut, uterus ; hd, hermaphrodite duct ; lig, hermaphrodite 

 gland ; ag, albuminous gland. 



