54 



vasa efferentia. In the posterior part of the clitellum each 

 vas deferens curves slightly, and, from being ventral, turns 

 dorsal, and runs forward to the anterior end of the eighth, 

 or the posterior end of the seventh segment of the preclitel- 

 lum : here each widens out to form the respective ductus 

 ejaculatorii, which, from being dorsal, turn abruptly and 

 run ventrally in a posterior direction. In the first segment 

 of the clitellum the ductus ejaculatorii unite and enter the 

 bursa by a common-end portion. The bursa, which has a 

 fairly considerable saccular development, is, on its dorsal 

 side, immediately posterior to the common opening of the 

 ductus ejaculatorii, thickened to form a conical muscular 

 penis, which functions as a copulatory organ. In none of 

 the specimens is the penis extruded, and the common-end 

 portion of the ductus ejaculatorii does not enter it, as far 

 as I can discover. The female reproductive organs consist 

 of a pair of pear-shaped vesicles situated in the first segment 

 of the abdomen, their anterior portion being in advance of 

 the first pair of testes, and their posterior and more pointed 

 portion between the testes. Each vesicle contains in con- 

 siderable numbers complex ovular bodies in all stages of. 

 development, over and above the germinal mass, in which 

 two or three nuclei are enveloped by a mass of surrounding 

 protoplasm.. The eggs fall into the ovarian cavity, where 

 they complete their development. The development of the 

 ova has been carefully described by Perez and Gendre 

 (1904b). The ovaries are of very large size, as compared 

 with those of other leeches, such as CalliobehUa and 

 Plat yb del la, being in the one of the smaller specimens 

 sectioned, very obvious, and half as large as a testis. A 

 short oviduct leads from the vesicles to the female genital 

 aperture. 



Generic Characters. — Abdomen very distinctly marked off 

 from the neck, the anterior portion covering the genital 

 apertures on the clitellum as a preputial fold. Each 

 abdominal somite (except perhaps the first) consists of three 

 annuli. The abdomen is flattened and bears laterally foliace- 

 ous branchiae, not less than 30 pairs (the genera Ozobranchvs 

 and Eubranchella bearing quite a small number of pairs — 

 viz., 5 and 7 pairs respectively). Along the side of the 

 abdomen are 11 pairs of pulsating respiratory vesicles, a pair 

 i:o every segment except the first, a vesicle being at the base 

 of the gill of the first annulus of each somite. 



Sp ecific Ch ara c t ers : — 



B. australis, n. sp. B. toepedinis, Savigny. 



<1) Branchiae, 31 pairs. (1) Branchiae, 33 pairs. 



