BY J. J. FLETCHER AND A. G. HAMILTON. 351 



Eight of these are new, but the remaining two species agree so 

 well as regards their external characters with the descriptions of 

 Ccenojilana ccerulea and C. siobviridis of Moseley, except in the 

 matter of eyes on the anterior extremity, that we cannot but 

 think that they are identical with them, but that Mr. Moseley, 

 possibly fi'om an insufficient or inditierent supply of material, or 

 from the study only of spirit specimens overlooked the presence of 

 eyes on the anterior extremity. That Mr. Moseley had too much 

 to occupy his attention dui'ing his short stay here to permit of 

 studying the Australian planarians in the living condition is very 

 probable from the fact that, in the same volume of the Journal 

 which contains the paper already referred to, there is an earlier 

 one, " On the Colouring Matters of Various Animals, and 

 especially of Deep-Sea Forms dredged by H.M.S. Challenger" 

 (op. cit. p. 11) in which the following passage occurs: "At 

 Parramatta, near Sydney, N.S.W., two large species of Rhyncho- 

 demus ai-e tolerably common, one of which is of a uniform 

 Prussian blue colour, whilst the other is a uniform red." From 

 this passage it would appear that when this earlier paper was 

 written Mr. Moseley had investigated only the colouring matters 

 of the Australian planarians, otherwise he would not, even provi- 

 sionally, have referred these two many-eyed species to a genus 

 characterised by the possession of two eyes , the descriptions of 

 Austi'alian planarians were thus probably drawn up at a later 

 period, and therefore from spirit specimens. This being so, we 

 can from our own experience with spirit specimens readily under- 

 stand how the over.sight might have occurred ; as though we have 

 spirit specimens of some species in which the eyes on the anterior 

 extremity are perfectly visible with a lens, we have others in 

 which without having seen living or better preserved specimens 

 should be very sorry to be obliged to give a decision on this point. 



In his description of the Tasmanian form Mr. Darwin says : 

 " ocelli scattered round the entire margin of the foot, but most 

 frequent at the anterior extremity." In his description of 

 Ccenoplana Mr. Moseley says : " eyes absent from the fi"ont of the 

 anterior extremity, but present in lateral elongate crowded patches 



