EXPLANATION OF PLATE XVIII. 



FIGURE 89. Brancbiobdolla Kuvenelii, (p. 624 ;) dorsal view, natural size. 

 90. Malacobdella obesa, (p. 625 ;) dorsal view. 

 91. Poutobdella rapax, (p. 625 ;) dorsal view. 

 92. PhascolosoiiiM cfementariam, (p. 627;) lateral view. 

 93. P. Gouldii, (]>. 627 ;) lateral view, reduced one-balf. 



94. Ponton cilia niarinum, (p. 634 ;) female, lateral view, enlarged 15 diam- 

 eters; o, eggs ; v, genital orifice. 



(Figure 94 was drawn from a living specimen, by A. K. Vcrrill ; all the others were drawn from pre- 

 Kerved specimens, by J. H. Emerton.) 



