188 l^ransactions. 



(or seminal vesicle) ; when the duct leaves this it dilates to form 

 a large ovoid muscular sac, from the anterior end of which a 

 narrow duct passes transversely, to open into a median, globular, 

 gland-covered " prostate," from the posterior end of which the 

 long, curved, muscular " penis-sac " (cirrus-sac) passes back- 

 wards, then bends forwards ventrally to open to the exterior 

 at the male pore, just behind the sixth ganglion. 



The most striking point in which this species differs from 

 H. medicinalis is the presence of the ovoid muscular sac, which 

 no doubt corresponds to the comparatively narrow muscular 

 " ductus cjaculatorius " of that species. 



The female organs consist of the usual pair of small ovarian 

 sacs, each of which communicates by a narrow oviduct with the 

 anterior end of a large gland-covered sac (the albumen-gland), 

 from the hinder end of which a comparatively wide " uterus " 

 passes backwards, then curves forwards ventrally and ber'omes 

 the " vagina," which opens by the female pore just behind the 

 seventh ganglion. The " uterus " is readily distinguishable from 

 the vagina by the difierent character of the wall, the latter 

 having distinct circular muscles surrounding it. 



In one specimen opened both the male and female duct lie 

 on the right side of the nerve cord ; in the second, the male is 

 on the right and the female on the left side. 



Remarks. — There is a superficial resemblance to a leech 

 from New South Wales — H. australis, Besisto (3) — in which olive- 

 brown and yellow bands alternate ; but an examination of the 

 coloured figures given by Becker (1) and by Schmarda(15) show 

 essential differences in the arrangement of these bands.* In it 

 the yellow predominates over the darker tint, which, according 

 to Schmarda and Besisto, is nearly black in life. The median 

 dark band is quite narrow, bordered on either side by a slightly 

 broader yellow band : this is followed successively on each 

 side by two dark separated by two light bands of approxi- 

 mately equal breadth, much greater than that of the median 

 and admedian bands ; but the outer dark band is narrower than 

 either of the yellow bands. 



It is true that coloration alone may be insufficient to dis- 

 tinguish two leeches, for a considerable range of variation is 

 known to occur in H. medicinalis — the best-studied species of 

 Hincdo ; nevertheless, Grube states that all the specimens 

 studied by him exhibit the same pattern ; and all my New Zea- 



*I have followed the synonymy given by Grube (10), who identities 

 H. qiiinque striata, Schmarda, with H. australis, Besisto. Blanchard, how- 

 ever, refers to Schmarda's species as belonging to his genus LinnohdeUa 

 (5, p. 29), and does not refer to Besisto's specific name. 



