REPORT ON THE AMPHIPODA. 703 



specimen sent me by Mr. Haswell), but also in several detcails of the mouth-organs, and 

 in having a shorter wrist to the first gnathopods, the hand of the second more expanded 

 distally, the side-plates of the fourth pera3on-segment rounded behind instead of squared, 

 those of the fifth segment more and more narrowly produced downwards behind, and 

 the first joint of the third perseopods pear-shaped, being narrow above and postero- 

 distally expanded. 



Amaryllis haswclli, n. sp. (PI. XXVIIL). 



Head similiar to that of Amaryllis bathycephalus, with a rather stronger rostrum, the 

 whole animal of rather narrower habit than that species ; postero-lateral angles of the 

 third j)leon-segment acute, not upturned, the hinder margin bulging a little beyond 

 the point and so forming a little pocket, which occurs in all the three species of the 

 genus at present known. 



Eyes probably present, but not clearly observed. 



Upper Antennae. — The first joint of the peduncle elongate, with a depression above 

 near the base, distally prolonged on the inner side into a tooth more than half the length 

 of the following joint ; the second joint shorter and much thinner than the first, about 

 three times as long as the third, having a short distal tooth ; third a little longer than the 

 first joint of the twenty-four-jointed flagellum, the joints of which carry not very con- 

 spicuous cylinders ; the secondary flagellum of four slender joints, the first two together 

 scarcely exceeding in length the first of the primary. 



Loioer Antenna}. — The first joint very much outdrawn below, the gland-cone small, 

 the third joint short ; the fourth joint nearly twice as long as the fifth, as long as the 

 first of the upper antennae without the tooth ; the fifth joint rather longer than the 

 first four of the twenty-two joints of the flagellum. 



Triturating Organs. — These present a row of a few spine-teeth, short, stout, serrate on 

 both margins, followed by a row of similar spines, but more numerous and rather longer 

 and thinner, beyond these again a close-set fringe of bristles appearing. 



Mandibles. — The cutting edge slightly convex, with a small tooth at the top, the 

 secondary plate of the left mandible with the distal edge obscurely dentate ; the spine- 

 row as in the preceding species consisting of numerous spines among cilia ; that some 

 of the ten spines were slender and others stumpy was probably due to the more worn 

 condition of the latter ; molar tubercle weak, directed backwards, set only with cilia ; 

 the articular condyle advanced over the spine-row ; the palj) set rather far back over the 

 molar tubercle, the long second joint without spines ; the third joint, together with the 

 first not quite equalling the length of the second, having nine spines along the upper 

 part of the inner margin, one at the apex very large, and adpressed cUia as usual on the 

 surface. In the Plate the outside of the left mandible is represented in the lower 



