English Ampkipodous Crustacean. 61 



The second maxilla? are also slender, the outer plate a little 

 overtopping the inner, each being surmounted with three or 

 four spines. 



In the maxillipeds the inner plates are elongate, with 

 incised, not sloping, distal margins ; the outer plates, of some- 

 what oval shape, do not reach to the end of the second joint 

 of the palp. They have a relatively large apical spine, and 

 along the upper part of the inner margin excessively fine 

 spines. The third joint of the palp is somewhat longer than 

 the first or second, with an inner lobe at the base of the finger. 

 The finger is well developed, curved. 



Among the perseon segments the second is narrower than 

 any of the others. 



The two gnathopods are nearly alike in structure, except 

 as to the hands. That of the first gnathopod narrows distal! v, 

 has no distinct palm, and carries spines or hairs on the palm- 

 margin. In one specimen there were two small groups, in 

 another four spines spaced at equal intervals along the margin. 

 In the second gnathopod the hand widens towards the palm, 

 which is defined by a broad tooth-like process in which are 

 inserted two relatively strong spines, between which the finger 

 closes clown. The margin of the palm is convex. In both 

 hands the strong curved finger has on the concave margin 

 three little teeth followed by a larger one, after which comes 

 the sharp-pointed nail. 



The side plates of the first three perseopods are neatly 

 fitted together, forming almost an oval, truncate on the upper 

 side. Of the three, the side-plate of the second perasopod is 

 much the largest, with a convex front and an excavated hinder 

 margin, the excavation being filled in by the small plate of 

 the third pera^opod. 



The first, second, and third pera?opods are similar in struc- 

 ture, with long and slender first joints ; the third joints a little 

 dilated, more so proximally than distally ; the fifth joints a 

 little longer than the fourth ; the fingers fairly strong, curved. 

 In the third pera?opod, however, the four last joints are all 

 respectively a good deal shorter than those in the first pergeo- 

 pod. The fourth pereeopod has the first joint winged with a 

 dilatation so transparent as easily to escape notice, except in 

 a good light. It is shorter than the first joint of the preceding- 

 leg. In the fifth perajopod the dilated first joint has a sinuous 

 lower margin. It may be roughly regarded as quadrangular, 

 but the sides are not straight and the lower part is rather 

 broader than the upper. 



The three first segments of the pleon are longer than any 

 of those of the perreon except the fifth. They carry pleopoda 



