THE society's NOTE-BOOKS. 51 



typical species are not at present understood ; Berkeley considers 

 they will eventually prove to be connected with the fructification. 



H. Basevi, 



ZOOLOGICAL. 



Fish-Parasites. — I am told there is a Jack in the fresh-water 

 tank of the Brighton Aquarium (1876), on whose skin two kinds 

 of parasites are to be found in such large quantities that they are 

 a source of very great inconvenience to his swimming capabilities. 



E. LOVETT. 



Fleas. — The fleas of animals seem to bear a strong resem- 

 blance one to another. I have slides of Dog-flea and also of 

 Ferret-flea, and on comparing with the slide of Cat-flea I notice 

 that the neck-fringe of the Dog-flea is more defined than that of 

 the Cat-flea ; but in the Ferret-flea, although the fringe corresponds, 

 the shape of the body is totally different, being more slender and 

 elongated, I have seen swifts and moles swarming with their 

 respective fleas, and I agree with Mr. West that they must in 

 consequence suffer severely at times. 



E. LoVETT. 



With respect to Cat- and Dog-fleas, I believe the same species 

 is often found on both animals, even if each animal has a species 

 peculiar to itself. 



H. M. J. Underhill. 



Fleas. — In my experience Human fleas have neither comb on 

 their neck or fringe round the mouth. Bird-fleas have the comb 

 on neck, but no spines round the mouth, and Animal-fleas have 

 both neck-comb and mouth-spines. 



H. E. Freeman. 



Ovipositor of Saw-fly. — Lyonet (Recherches posthumes 

 Planghe, 15, Figs. 18 and 19,) gives drawings of the saws of 

 Alhmtus flavicorm's, which correspond very closely with those 



