EXPLANATION OF PLATE XVIIL 



FiGURK 89. — Brancbiobdella Eavenelii, (p. 624;) dorsal view, natural size. 

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

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

 92. — Phascolosonia ca^mentarium, (p. 627;) lateral view. 

 93. — P. Gouldii, (p. 627;) lateral view, reduced oue-balf. 



94. — Poutouema marinum, (p. 634;) female, lateral view, enlarged 15 diam- 

 eters ; 0, eggs ; v, genital orifice. 



(Figure 94 was drawn from a liviufj specimen, by A. E. Verrill ; all the others were drawn from pre 

 served specimens, by J. H. Emerton.) 



