374 SUBANTARCnc ISLANDS OP NEW ZEALAND. [Hirudinea. 



The buccal sucker, with 12 annuli, consists of presumably 4 segments ; the neck 

 of 6 segments ; the trunk of 16 segments, the last two of which have only 2 annuli 

 apiece : this gives a total of 26 segments in the body, without counting the posterior 

 sucker, which I have not attempted to analyse, for the above enumeration agrees 

 with that of the Hirudinea in general. 



The male pore is situated between the clitellar annuli 2/3 — i.e., it is behind 

 the 15th annulus of the neck. The female pore is apparently at 18/19, or it may 

 be on the 19th annulus, for the body is so contracted here that without cutting 

 sections it is impossible to be certain. 



From the male pore there projects a small penis ; behind the female pore there 

 is on the 19th annulus a pair of white swollen papillae close to the middle line, which 

 partially conceal the actual pore. 



I am unable to detect the nephridiopore. 



Locality. — Snares Island, on Notothenia microlepidota. 



/?em«r^.— Blanchard* has described a marine leech from Uschuaia which in 

 several respects bears a resemblance to the above. But this Ichthyobdella australis 

 differs in details of annulation, there being 6 annuli to the trunk segment ; the 

 coloration and the position of the genital pores are also different, but, like the above 

 species, it seems to be without the gills. The possession of 11 pairs of vesicular 

 gills is included in the diagnosis of the genus, which precedes the account of the 

 species ; yet Blanchard does not mention the gills, nor do either of the figures show 

 them. In the diagnosis it is not stated that these structures may be absent. 

 Hence I have created this new genus. 



Order GNATHOBDELLIDA. 



Fam. HIRUDINIDAE. 



Subfam. HIRUDININAE. 



Ornithobdella, gen. nov 



Ornithobdella edentula, sp. nov. 



The soil of the Snares under and around the nests of penguins, mollymawks, 

 and mutton-birds contains a great number of leeches of some considerable size. 

 They were familiar to our Maori boat-crew, who stated that they suck the blood of 

 the mutton-birds at night. As the young of these birds are captured by the Maoris 

 for food, their attention would naturally be directed to these particular birds, but 

 there can be no doubt that these leeches also suck the blood of the penguins, for 

 the intestine of the individual dissected, which was collected at a penguin-rookery, 

 was gorged with blood. These birds, it is needless to mention, are the only source 

 of food for the leeches, as, except for the seals, which are not likely to be 

 attacked, they are the only animals on the island. I tried to persuade a leech to 

 bite my finger, but it did not, and the reason became clear on dissection ; they are 



* Blanchard, " Hirudineen der Magalhaensischen Sammelreise," vol. iii. 



