420 ALFRED GIBBS BOURNE. 



Branchellion, Saviguy, 1817. 



GXATHOBDELLIDiE 



Aulostoma, Moquin-Tandoiij 1826. 

 Hasmopis, Savigny, 1817. 

 Hirudo, Blainv, 1827. 

 Hsemadipsa,? 

 Nephelisj Savigny, 1817. 

 Trocheta, Dutrochet, 1817. 



Material. — With the exception of Branchellion, Heemo- 

 pis, and Hsemadipsa, all these genera are to be found in 

 England. 



Pontobdellais thrown up on the beach or brought in on the 

 skate-fish from time to time upon our South and East Coasts. 



Piscicola is to be found upon various species of fresh- 

 water fish. I received numerous examples from the Duke of 

 Wellington's trout-breeding establishment at Strathfieldsaye. 



Clepsine is very common in ditches and streams in England. 



Of Branchellion I obtained four living specimens only 

 during three months spent at the Stazione Zoologica at Naples 

 in the early part of 1882, and in 1883-84. 



Poutobdella I obtained in large quantities at Naples, and 

 kept it living in the aquaria there, 



Aulostoma is the commonest of our pond leeches. 



OfHsemopisI obtained a single specimen in the neighbour- 

 hood of Naples. 



Hirudo, although not so much used as formerly, is exported 

 in enormous numbers from Bourdeaux and other places. I 

 have also taken one or two specimens near London, one from 

 a pond near Putney Heath. 



Hsemadipsa, the pond-leech of Ceylon and Japan, was 

 brought in a living condition by Dr. C. O. Whitman to Naples, 

 and he very kindly placed some specimens in my hands. 



Nephelis is abundant in the mud of ponds and streams in 

 England. 



Trocheta is a very rare leech in this country. The majority 

 of the authentic specimens have been picked up in Regent's 

 Park, London, possibly imported from abroad in earth or clay, 



