206 
CalliohdeUa loph ii 
segment, but whether they are derived in the manner stated by Blanchard 
or in that stated by Johannson I do not know, nor do I see on what 
grounds their statements rest, seeing that Johannson at least only 
examined preserved specimens. Comparing Calliobdella with Ponto- 
hdella it would seem that the first annulus of the segment in Calliobdella 
corresponds with the 1st and 2nd of Pontobdella, the 2nd and 3rd 
Fig. 1. Calliobdella lophii. The entire animal viewed from the ventral surface, to show 
the segmentations and annulations. Numbering and lettering explained in the text. 
Fig. 2. The anterior portion of the same, viewed from the ventral surface, on an enlarged 
scale, m.g. male genital aperture,/.s’, female genital aperture, C, t- the first-two pairs 
of testes, Ov. ovaries, r.v. respiratory vesicles. 
