George: Notes on the Crista of some British Earthmites. 201 
Scotland, and one from Gloucestershire, and find that the 
variation in different specimens is very slight. 
Figs. b and c are dissections from Tvombidium holoseri- 
ceum. This mite, though one of our largest species, has 
remarkably small crista, not mentioned or figured by me in 
the description of it on page 333 of ‘The Naturalist ; 
for September 1908. It is difficult to see in the unmounted 
mite in consequence of the very thick coating of long-feathered 
hairs in the skin covering it, as well as the presence of other 
structures. Moreover, it is bent like a bow, and difficult to 
fix in a position like that which it has in the living mite, 0 is a 
front view, and c is a view partly on its side. It may be to 
some extent seen in mounted specimens which have been 
bleached and flattened. 
Fig. d is the crista of Ottonia bullata. This pretty little mite 
was figured and described in ‘ The Naturalist’ for March 1909, 
page 88, and Plate IV. 
Fig. e is the crista of Rhyncolophus communis. Here we 
find a distinct and rather large capitulum. The mite from 
which this was taken is figured on page 428 of ‘ The Naturalist ’ 
for December 1910. The crista can be seen in the unmounted 
mite. 
Fig. f, the crista of Ottonta valga. This mite and its crista 
is figured in ‘ The Naturalist,’ December 1909, plate XVIII. 
Fi3. g, crista of Ottonia evansii, figured Joc. cit., plate X., 
May 1909. 
Fig. h, crista of Johnstoniana errans. The mite is figured 
loc. cit., August, 1909. 
Fig. 7, crista of Ottonia bicolar. Loc. cit., plate I1., Feb., 
IgI0. 
Fig. k, crista of Ritteria hirsutus. Loc. cit., plate KS ewprils 
IgIO. 
On plate XXXIX. of ‘ The Naturalist ’ for October, 1907, 
is a figure of the crista of Eatoniana plumifer, fig. 12. Here the 
capitulum is not ball-shaped, but conical. I have also seen the 
crista in Ritteria nemorum, R. mantonensis, Ottonia clavata, 
O. conifera and O. ramosa. I have also a few mounted speci- 
mens which I am not able to describe for want of recent examples. 
Besides these, there must be many species I have not met with. 
Possibly some younger acarologists will continue the work, and 
record their investigations in ‘ The Naturalist.’ 
Fig. 7 is the palpus of a Trombidium, with the claw double ; 
the only time I have found this to be the case in holosericeum. 
rr 
Prof. T. Rupert Jones, whose death is announced at the age of 91, 
was well known as a geologist half a century ago, and at different times 
has occupied prominent positions in various scientific societies. He was 
an authority on the Entomostraca and Estheride. 
1gt1 May I. 
