308 MR. G.S. BRADY ON BRITISH MARINE MITES. _[ Apr. 6, 
there is a styliform appendage (fig. 6, 6). The first three pairs of 
legs are of nearly equal length, the last pair distinctly longer, 
all gradually tapering from the base and having subequal joints, 
except the third and penultimate joints, which are short, and 
the last, which is long, slender, and tapering, and terminates in two 
delicate claws. The limbs, as well as the body, are beset with stout 
hairs, the last joints of the legs being rather thickly tufted. Eyes 
two, lateral, at the base of the second pair of feet. 
There is a good deal of diversity in the proportions and develop- 
ment of the mandibles and palps in different individuals of this 
species, probably dependent upon age (or sex’). The more highly 
magnified figure (fig. 6) seems to me to belong probably to the 
adult, while the state of the parts shown in the drawing of the entire 
animal (fig. 5) may be supposed to be characteristic of youth. 
In some specimens the lower joints of the legs are lable to run out 
into irregular subspinous processes. 
G. marinus occurs pretty commonly in crevices of magnesian 
limestone rocks, between tide-marks, near Sunderland ; and | have a 
specimen which was washed from amongst the roots of Algze 
dredged off Cumbrae in the Frith of Clyde. 
Genus Curyuetus, Latreille. 
CHEYLETUS ROBERTSON], noy. sp. (Plate XLI. figs. 1-4.) 
Length {5 of an inch; pellucid, smooth, almost colourless. 
Body broadly ovate, constricted in front of the origin of the first 
pair of legs, the head and rostrum forming a triangular prominence, 
the lateral angles of which are much produced; from the front of 
these angles spring two very tumid, imperfectly jointed palps, 
which reach beyond the tip of the rostrum, and terminate in a 
large curved claw and several long sete, two of which are beauti- 
fully pectinated on their inner margins with long, tooth-like cilia: 
the swollen base of the palp bears a single long hair, which reaches 
much beyond the point of the terminal claw. The rostrum consists 
apparently of two opposing triangular plates, from the tips of which 
spring two small sete. The two hindmost pairs of legs are of 
nearly equal length, the second somewhat shorter, all bearing a 
few long scattered hairs, and having long and slender terminal joints 
which are armed with delicate, doubly curved claws (figs. 3 and 4). 
The legs of the first pair are much longer and more slender, anten- 
niform, the joints gradually tapering and increasing in length from 
first to last: the thighs are moderately remote. Two long lateral 
hairs spring from near the middle of the body between the second 
and third pairs of legs; and there are two lateral tufts of three hairs 
each near the posterior extremity. 
One specimen only of this remarkable mite was dredged off Haw- 
thorn, on the Durham coast, ina depth of 27 fathoms. I have 
named it after my valued friend Mr. David Robertson of Glasgow, 
who was my companion on the dredging-expedition when it was 
taken. The mouth-organs are so like to those of Cheyletus erudi- 
