306 MR. G. S. BRADY ON BRITISH MARINE MITES. [Apr. 6, 
The single specimen on which Mr. Hodge founded this species 
was taken on a stem of Coryne eximia from between tide-marks ; and 
there can be little doubt, from the fact of its possessing only three 
pairs of legs, that it is merely the young of some other species. 
The specimen, moreover, which is now in the Museum of the 
Natural-History Society at Newcastle-upon-Tyne, has in other 
respects the appearance of immaturity, the surface-markings and 
different areas of the body being very imperfectly defined. I 
strongly suspect that it may prove to be an early stage of the fol- 
lowing species. 
PACHYGNATHUS SCULPTUS, nov. sp. (Plate XLII. figs. 1-6.) 
Length ~. of an inch: colour reddish brown. Body oblong- 
ovate, deeply indented at the origin of the limbs. The head forms 
a wide bulbous projection, from which springs a rather short and 
thick mucronate rostrum. The mandibles and palps are both 
poorly developed, the Jatter being short, thick, and terminating in 
small claws, the former consisting each of a short, slightly curved 
stem, which is furnished with two small setze and a wart-like tooth 
on the concave margin. The two hinder pairs of legs are rather 
longer and more slender than the rest; thighs distant, being in- 
serted near the margins of the body; second and fourth joints of 
the legs very small and constricted; third and fifth (especially in 
the first two pairs) larger and much swollen; first joint small in the 
two anterior pairs, rather longer in the two posterior ; last, or sixth, 
joint of moderate length, suddenly tapering from the middle and ter- 
minating in two falcate claws, each with a small tooth on its convex 
margin. The dorsal surface of the body is mapped out into several 
distinct areas, characterized by pitted and corrugated systems of 
sculpture: the head and rostrum form an area bounded by a convex 
line, which stretches between the origins of the first pair of feet : 
immediately behind, and separated only by a lateral indent, is a sub- 
quadrate plate, broad in front and rather narrowed at its posterior 
extremity, which coincides with the middle of the body ; behind this 
plate again, and separated from it by a narrow isthmus of corrugated 
epidermis, comes another elongated shield-shaped plate, which 
stretches quite to the hinder extremity of the body, increasing in 
width posteriorly: these three areas are all covered with closely set 
circular pittings, and are divided from each other by spaces of 
wrinkled epidermis, the lines of which are somewhat waved and ir- 
regular, but run generally in a concentric manner round the dotted 
shields: on the lateral aspects of the body also are two pitted areas, 
one vaguely defined and embracing the origins of the first and 
second pairs of legs, chiefly on the inferior surface of the body, the 
other having very distinct boundaries and extending almost equally 
on the upper and lower aspects of the body, from midway between 
the second and third pairs to the origin of the fourth pair of legs. 
The ventral surface of the body is chiefly corrugated, the head, 
however, being distinctly pitted as on the dorsal aspect; a space 
corresponding with the dorsal thoracic shield has no perceptible 
