334 On the Classification of some British Fossil Crustacea. 
belong to the fossorial family in which I have placed it, the nearest 
analogue being perhaps the recent Gebza which burrows under 
the mud of Plymouth Sound: the fossils abounding in such a 
state of perfection in the fine Speeton clay that they must have 
lived in it and died in the exact spots we now find them, har- 
monizes with this view of approximating them to those similar 
little forms which live habitually buried in the mud. The sub- 
stance of the crust, though very thin, and, in the following spe- 
cies especially, often showing signs of considerable flexibility, 
seems rather harder than in most of the fossorial types, and the 
strong fringe of stiff hairs at the end of the tail-pieces is in the 
fossil replaced by semi-membranous flaps, still however strongly 
suleated. I have not seen the extremities of the feet ; but if, as 
I suppose, the so-called Crangon Magnevilliz of Deslongchamp 
(Mém. de la Soc, Lin. de Normandie, t. v.) belong to this genus, 
the four hinder pair of feet would termimate in simple pointed 
claws, and the first pair form subcheliform pincers, having the 
hand dilated and truncated at the extremity, which is toothed 
and has a small spiniform immoveable finger at one end, which is 
met by the slender moveable finger inflexed from the other end ; 
this also agrees with the general type of the fossorial Gebiz. The 
carapace may be distinguished from Glyphea by the branchial 
furrow in it being very delicate and extending obliquely to the 
posterior margin without meeting its fellow of the opposite side, 
while in Glyphea they are very strong and meet on the back 
from opposite sides at an acute angle, without reaching the pos- 
terior margin. 
Meyeria magna (M‘Coy). 
Sp. Char. Carapace about 2} inches long and 1 inch 2 lines 
deep at the middle of the side; three strong tuberculated lon- 
gitudinal ridges on each side of the cephalic part of the cara- 
pace ; from about the middle of the deep nuchal furrow a row 
of small tubercles extends halfway to the posterior margin, 
and higher up (bordering the intestinal region) a similar row 
on each side extends from the posterior margin nearly half- 
way to the nuchal furrow ; rest of the carapace covered with 
minute sharp granules, about four in a space of three lines at 
the middle of the sides; rostrum short, pointed ; abdomen 
about 34 inches long, each segment with about four irregular, 
single, crowded rows of granules disposed longitudinally, the 
broad intervening spaces nearly smooth ; a few irregular groups 
of granules on the extremities; the last segment granulated 
like the carapace ; tail-flaps broad, rotundato-trigonal, finely 
fimbriated at the ends, each with a strong mesial ridge ; 
transverse suture of the outer pair strongly marked, serrated ; 
