280 WILLIAM A. HASWELL. 



del genero Branchiobdella por la preseucia de los ojos y de las 

 divisiones cefalicas de que no existe traza alguna en el." 



In 1870, Philippi 1 published some observations on Temno- 

 cephala, based on an examination of living specimens which 

 he found on the surface of Chilian fresh-water crayfishes of 

 the genus JEglea. He described the external form, the 

 colouration, and the movements, and notices certain of the 

 internal organs which he is able to see through the wall of 

 the body, though without being able to give auy precise 

 account of their nature. He concludes that Temnocephala 

 ought to be placed among the worms in the neighbourhood 

 of Malacobdella. 



During his scientific explorations in the Phillipine Islands, 

 Carl Semper found, on the surface of fresh- water crabs, speci- 

 mens of an external parasite, which proved to be the Temno- 

 cephala of Blanchard ; but a more detailed examination 

 showed him that the affinities of the animal were much more 

 with the ectoparasitic Trematodes than with Malacobdella 

 or the Hirudinea. 3 



Wood-Mason found, in 1875, a number of Temnocephalse 

 in a bottle containing some New Zealand crayfishes (Parane- 

 phropssetosus), to which they had evidently been attached, 

 and some also in bottles containing specimens from the north- 

 east frontier of India. 3 



At the beginning of last year, when on a visit to Tasmania, 

 my attention was directed by Mr. Alexander Morton, the 

 curator of the Tasmanian Museum at Hobart, to certain re- 

 markable animals observable on the surface of a specimen of 

 the large fresh-water crayfish of the northern waters of Tas- 

 mania, which he had alive in a tank. These proved to be 



1 ' Arcliiv fur Naturgeschichte,' 1870. 



2 ' Zeitscbrift f. wiss. Zoologie,' xxii Band (1872). I have not been able 

 to see this paper, which is a very short one (three papes), and am indebted for 

 my knowledge of it to Leuckart's " Bericht " in the ' Archiv f. Natur- 

 geschichte,' xl Band (1874.). 



8 "On the Geographical Distribution of the Temnocephala chilensis 

 of Blanchard," 'Ann. Mag. Nat. Hist.' (4), vol. xv, p. 336 (1875). 



