322 C. O. WHITMAN. 
Hamapipsa, Tennent (1861). 
Hemadipsa, Tennent, 1861. Hemopis, Schmarda, 1861. Chthonobdella, 
Grube, 1865, 1868. 
The older authors, Bosc, Blainville, Moquin-Tandon, &c., 
included the Land Leeches in the genus of freshwater leeches, 
known as Hirudo since the time of Ray. Tennent was the 
first to introduce a new generic name for the Land Leeches of 
Ceylon. Schmarda, who claims, erroneously as I believe, that 
there are several different species in Ceylon, refers them doubt- 
fully to the genus Hemopis. Diesing follows Schmarda in 
this respect. Grube was led by comparison of a few species 
to see the propriety of establishing a new genus, and—evi- 
dently in ignorance of Tennent’s work—proposed the name 
Chthonobdella. This name is unquestionably better chosen 
than Hemadipsa, but the claim of priority makes it neces- 
sary to abide by the latter. 
All the Land Leeches cannot well be included in the same 
genus, as will be shown more fully in a later paper embracing 
all the species at present known. The Australian species, for 
which I am indebted to Mr. Haswell, differs from all the other 
species that I have thus far examined in having only two jaws. 
The latero-ventral jaws are present, but the median dorsal jaw 
is entirely absent. This remarkable distinction, taken together 
with the fact that the genital orifices are separated by seven 
and a half rings instead of five, as in the case of most other Land 
Leeches, seems to make necessary the establishment of a new 
genus, for which I propose the name Geobdella Hema- 
dipsa may be reserved for the species found in Ceylon, India, 
Japan, &c., which have three jaws and five rings between the 
genital apertures. This genus may be more fully characterised 
as follows: 
Terrestrial. Body, at rest,2—3 cm. in length, sub-cylindrical, 
tapering slightly forwards; cephalic lobe, at rest, rounded, 
1 The fact that this name, once applied by Blainville to Trocheta, has now 
been entirely superseded by the latter name, removes any serious objection to 
its use here. 
