272 



HARDWICKE'S SCIENCE-GOSSIP. 



applied parts dearly enough. Moreover, if correct, 

 this theory of a differentiated under-lip ought to be 

 equally applicable to all the Gasteropoda, and it is 

 difficult to see how it could be applied to cases, like, 

 for instance, Paludina, in which the head having a 

 well-defined snout is yet further isolated from the 

 foot than in Lymnese. Hence, in comnaon, I should 

 imagine with other readers of Science-Gossip, the 

 writer would feel much obliged to the unknown 

 author of this interesting paper on " Water Snails," 

 if he would kindly explain at greater length this 



ON BRITISH FRESHWATER MITES. 

 By C. F. George 



[Continued from page 250.] 

 No. III. 



yi RRENURUS GLO BATOR (IMuller). This 

 .^J- is one of the smallest of the tailed mites ; it is 

 of a lightish green colour ; the markings produced by 

 the cceca are brown and white ; it is easily known by 



Fig. 195. — Another 

 specimen. 



Fig. 194. — Arreniirus glohator i 

 Supper side). 



Fig. 199. — Side 

 view of tail of 

 A. globaior. 



^y^ 



Fig. 196. — 2 in. 



Fig. 197. 



Fig. 198. — Under 

 side (I). 



Fig. 201. — Pal- 

 pus, under side. 



Fig. 200.— Under side of 

 hind leg of ^. globator. 



Fig. 202. — Arrenufus glolator Q (with 2 in.). 



remarkable development in molluscoid anatomy and its 

 application throughout the whole class Gasteropoda. 



B. B. Woodward. 



Rare Plants.— Mr. Newbitt would perhaps be 

 interested to know that I have a specimen of TroUhis 

 Eurcp,rits from Goathland, near Whitby. It is not 

 far from the celebrated locality for Cornus suecica, 

 viz., the Hole of Horcum.— y. A. Wheldon, 9 South 

 Street, Scarborough. 



the globular projection which it carries on the upper 

 surface of the tail. On the last joint but two of the 

 hind leg there is a peculiar spur-like projection, 

 carrying a brush of swimming bristles ; this projection 

 is also found on the hind leg of several of the male 

 Arrenuri. The female, as will be seen by the figure, 

 is as unlike the male as could be well imagined ; it 

 has no tail, and is much larger than its partner. 



Arrenurus buccinator (Midler). This mite is 

 much larger than A. globator ; the greater portion of 

 the body part is of a beautiful blue, becoming so dark 



