1887.] G-. M. Giles — Six neio AmpMpods from the Bay of Bengal. 225 



surface of the body and appendages is liberally besprinkled with patches 

 of black pigment, so that, seen in the water, they appeared of a dark 

 reddish grey tint. The pigmentation is deepest on the pleura of the 

 thoracic segments, on the basipodites of their appendages, and on the 

 abdomen. The lower part of the cephalon, too, including the gnathites, 

 is so deeply pigmented, that it is extremely difficult to make out the 

 arrangement of the parts, as they are almost opaque to transmitted and 

 nearly impossible to be illuminated by direct light. The entire length 

 of the animal is 2*5 m.m. 



The only two of the members of the genus enumerated in Spence 

 Bate and elsewhere which approach it in size are L. ferus and L. fuscuSf 

 though both of these are considerably larger than any of my specimens. 

 Moreover, in the present species, the seventh thoracic appendage (fourth 

 pereiopod) is considerably larger than the preceding and succeeding ap- 

 pendages, whereas in L. ferus all three are described as subequal, and 

 in L. fuscus the third pereiopod is stated to be longer than the fourth. 



It differs also from the description and figures of these species in 

 several other particulars. I would, therefore, propose to name it L. 

 hengalensis. 



In swimming, it progresses by a series of jerks, lying on its side and 

 moving in small circles. 



The head is the broadest portion of the animal, the two immense 

 eyes projecting considerably beyond the very narrow thorax when seen 

 from above. The eyes are of large size and distinctly faceted, the anterior 

 faceted membrane being easily separable, and they cover the entire upper 

 and lateral aspects of the head, the anterior aspect of which is deeply 

 excavated for the reception of the antennae. 



The thorax is composed of seven distinct, but very short, segments ; 

 the junction between the pleura and the coxal plates being hard to make 

 out, as also are the junctions of the terga of the first 5 thoracic segments. 

 The segments increase in length slightly from before backwards, but not 

 to any very marked extent ; the entire thorax forming less than a third 

 of the entire length of the animal. 



The first three abdominal segments are of very large size, especially 

 the first two, either of which is as long as any three of the thoracic 

 segments. The fourth abdominal segment is much shorter and narrowed 

 in front, so as to be freely movable under the much excavated posterior 

 border of the third. The fifth and sixth abdominal segments are very 

 small, and the latter is united without suture to the short, accurately 

 semicircular telson. 



The antennules are as long as the entire body of the animal plus 

 the protopodite of the sixth abdominal appendage. Their peduncles 

 29 



