W. H. Leigh-Sharpe 
283 
Reproductive System. The position of the genital openings on 
the clitellum has already been stated (Figs. 1 and 8 a). The male 
reproductive organs consist apparently of jive pairs of metameric testes 
situated in segments two to six of the abdomen, instead of six pairs 
as is usual in the Ichthyobdellidae. Johansson writes: “only in 
Abranchus is there a smaller number” than six “observed constantly. 
I have never observed more than five pairs in this genus, and in A. 
brunneus sometimes not more than four pairs situated in the first four 
Fig. 6. Platybdella anarrhichae. A, scheme of the digestive system, partly from the ventral 
aspect, to agree with Fig. 1, showing the natural position of the posterior sucker 
flexed under the abdomen, m. mouth; a. anus; ph. pharynx; ph.s. pharyngeal 
sheath; s.g. srlivary glands; St. stomach; c. caeca (ventral); Ini. intestine; B, the 
posterior end of the same, lateral aspect. 
or five segments” (of the abdomen). “Often I have observed in this 
genus, as in others, that one testis of a pair can be absent but one finds, 
on anatomical investigation, a trace thereof in the form of a little cavity, 
and usually one even sees a trace of the corresponding vas efferens.” 
Van Beneden and Hesse state that in Platybdella ( Ichthyobdella ) 
anarrhichae there are five pairs of testes. 
I have previously remarked on the extraordinary transparency of the 
skin of this animal, so that the cocoon gland cells are visible through it, 
