136 Eev. 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 setse at the extremity ; wrist fully twice as 

 long as meros, upper margin with transverse rows of simple 

 setffi, the distal portion between the two distal rows of setee 

 densely clothed with short fur, the face of the joint below with 

 two or three transverse rows of setas ; lower margin with nume- 

 rous fascicles of setae ; hand regularly ovate, much shorter 

 than wrist, upper margin having the distal portion with trans- 

 verse rows of setse ; lower margin with fascicles of setse, the 

 portion which forms the palm terminated by a small tooth-like 

 process, very minutely creiiulated and furnished with a series 

 of little spinules ; finger falcate, its inner margin divided up 

 into minute teetli of peculiar form, widening in the middle 

 and apiculate. All the setse of the limb are simple except 

 that mixed in the two distal fascicles of setse on the lower 

 margin are a few flattened setfe 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 setse and spinules ; about four spines 

 on side of the hand just within the palm ; a row of equidistant 

 cilia on inner and of setae on outer margin of the nail. 



Thigh of last perseopods 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. 



Epimcra of the anterior segments of body with a single 

 tooth on the infero-posteal corner. Third segment of pleou 

 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. ohtusata and M. gladiosa. In 

 the specimen here described from CuUercoats 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 

 antennse. 



A large Greenland specimen taken in 1876 by H.M.S. 

 ' Valorous ' measures 22 millim. exclusive of antenna, and 



