1877.] MR. G.S. BRADY ON BRITISH FRESHWATER MITES. 25 
Class ARACHNIDA. 
Order ACARINA. 
Family TrRomBrpiaD&. 
Genus Rapuicnatuus, Dugés. 
RAPHIGNATHUS SPINIFRONS, nov. sp. (Plate III. figs. 2-5.) 
Carapace strong and horny, entire, tapering to an acute point in 
front, broadly rounded behind, notched at the insertions of the legs. 
Mandibles (fig. 4) stylet-shaped, projecting about as far as the ros- 
trum; palps short and thick, obtuse, armed with a few long hairs, 
and near the apex with four short claw-like sete (fig. 3, 6). Coxze 
contiguous, all arising from the anterior half of the body ; legs five- 
jointed ; terminal joint very long and slender, tapering much towards 
the apex, antepenultimate joint very small, basal joint short. The 
claws are three in number (fig. 5) on each limb, and are moderately 
curved. The side of the carapace just behind the rostrum (fig. 3) 
is produced into four strong spines. The last three joints of all the 
legs bear numerous long hairs ; and the penultimate joint of the first 
pair is provided also at its outer apical angle with a single very long 
seta, which reaches beyond the extremity of the limb itself. Eyes 
not seen. Colour of the carapace dark brown, opaque; of the 
limbs a clear reddish-brown. Length =, of an inch. 
Two examples of this species were found amongst a gathering of 
Entomostraca taken in Crag Lake, Northumberland, in September 
1876. It seems to be very nearly allied to a terrestrial species 
described by Dr. George Johnston, in the ‘ Transactions of the Ber- 
wickshire Naturalists’ Club,’ under the name of Carabodes nitens. 
Besides the difference of colour, however, which in Dr. Johnston’s 
species is ‘ pitch-black,” there appear to be important distinctions 
(perhaps of generic value) in the structure of the mandibles and 
palps ; nor in the description of C. nitens is there any note of spinous 
armature of the carapace. 
Genus Ruyncuotoruvs, Dugés. 
RHYNCHOLOPHUS HISPIDUS, nov. sp. (Plate IV. figs. 1-3.) 
Body soft, apparently destitute of any chitinous carapace; oblong- 
ovate, covered with thickly set hairs, which are short on the anterior 
half but longer behind ; the limbs also are densely hispid, especially 
towards the distal extremities. Coxee distant; 7. e. the first two 
pairs of legs are separated from the hinder pairs by a long interval. 
Mandibles short, included in a short triangular sheath; palps short 
and stout, the terminal joint wide (fig. 2), and having externally a 
cushion-like hairy papilla, and internally a short strong claw. The 
limbs are rather slender, the fourth pair the longest, second shortest, 
third and first pairs nearly equal: the first two joints are, in all the 
limbs, small, the rest being nearly of equal length except in the two 
hinder pairs, where the terminal joints are small. The last joint in 
all the limbs is considerably dilated (fig. 3), and is armed with two 
