136 Rev. A. M. Norman’s Notes on British Amphipoda. 
First gnathopods having meros rather longer than broad, 
below well rounded and covered with dense fur, and with 
a fascicle of sete at the extremity; wrist fully twice as 
long as meros, upper margin with transverse rows of simple 
sete, the distal portion between the two distal rows of sete 
densely clothed with short fur, the face of the joint below with 
two or three transverse rows of sete ; lower margin with nume- 
rous fascicles of sete; hand regularly ovate, much shorter 
than wrist, upper margin having the distal portion with trans- 
verse rows of sete; lower margin with fascicles of sete, the 
portion which forms the palm terminated by a small tooth-like 
process, very minutely crenulated and furnished with a series 
of little spinules ; finger falcate, its inner margin divided up 
into minute teeth of peculiar form, widening in the middle 
and apiculate. All the sete of the limb are simple except 
that mixed in the two distal fascicles of setee on the lower 
margin are a few flattened sete with pectinated edges. 
Second gnathopods of moderate size; meros small, pro- 
duced distally below to an acute point; carpus triangular, 
short, sparingly setose on the margins ; hand nearly twice as 
long as wrist, of nearly equal width to the commencement 
of the palm (which occupies two fifths of the length), thence 
tapering to extremity; margins sparingly setose; palm 
defined at its commencement by a tooth-like process, slightly 
denticulated, one denticle near base of finger larger than the 
rest, set with a few long sete and spinules ; about four spines 
on side of the hand just within the palm ; a row of equidistant 
cilia on inner and of sete on outer margin of the nail. 
Thigh of last pereeopods oblong, nearly parallel-sided, but 
the widest part at the base, distally truncate behind, front 
margin set with short spines, hind margin with distant crenu- 
lations, a cilium occupying each crenulation. 
Epimera of the anterior segments of body with a single 
tooth on the infero-posteal corner. ‘Third segment of pleon 
acutely produced infero-posteally and bent upwards. 
All the segments of the pleon are furnished on the dorsal 
margin with numerous teeth; but their exact number is sub- 
ject to considerable variation, as has been noticed in previous 
remarks to be the case in M. obtusata and M. gladiosa. In 
the specimen here described from Cullercoats they are: first 
segment five, second seven, third nine, fourth five, fifth three 
and two articulated spines. 
The British examples measure 11 millim. exclusive of 
antenn. 
A large Greenland specimen taken in 1876 by H.M.S. 
‘ Valorous’ measures 22 millim. exclusive of antenne, and 
