278 ASAJIRO OKA; ON SOME NEW 



HerpohdeUidœ. It is very interesting to notice that Lumhricohclella 

 Schceferi Kennel has 262 rings counted on the ventral side, a number 

 which clearly shows, that we have in this animal another example of a 

 leech with more than five rings in each somite. How many external 

 rings come to one somite in this case was, however, not ascertained by 

 Kennel. 



A form of land leech from Australia is mentioned by Whitman 

 (1886) under the naine of GeohdcUa (nee CTeoJ)della de Blain ville, 1828). 

 This genus is very nearly allied to Hœniadipsa, but differs from it in 

 having only two jaws, and also in the fact that the genital openings 

 are separated by seven and a half rings instead of five. So far as I 

 know, this leecii was only briefly referred to Ijy the same author in 

 speaking about the Japanese land leech, and we do not even know 

 what specific name he gave to the Australian animal. 



Tlie existence of still another land leech is recorded by Forbes 

 (1890) from North America. It is a species of the genus Semiscolex 

 Kinberg, whose members are generally aquatic. According to the 

 description given by Forbes, this genus seems to he very nearly 

 related to, if not identical with, the well-known genus Hœmojns 

 Savigny (1820) (Syn. Aulastoma Moquin- Tandon, 1826). 



The new genus of Japanese land leeches, for which I propose the 

 name of Orohdella,^ may be characterised as follows : 



Orohdella nov. gen. 



Bodily almost cylindrical, more or less flattened toward the hind 

 extremity ; the lateral margins of the iDody nearly parallel for the 

 greater part of the length; slightly taj^ering toward both ends. 



Rings, differing in number according to the species, but constant 



1 'OpoÇ moimtaiu, ßÔ£^.\a leech ; leech inhabitintr inountains. 



