REPORT ON THE CRUSTACEA MACRURA. 361 



bilobed, each lobe beiug long, flat, and armed with five long and strong spines, those 

 on each side of the base being directed forwards, and four radiating from the terminal 

 surface of each lateral lobe. 



The ophthalmopoda are fungiform, the stalk being slender and the eye broad, and 

 broader anteriorly than posteriorly. 



The first pair of antennas (b) is three-jointed, the basal joint having the greatest 

 diameter, the second being the longest, and the third the shortest and most slender ; 

 each is furnished with a hair or two, the third terminating in three long and two short 

 subapical hairs. 



The second pair of antennae (c) is biramose. The basal joint is nearly as broad as long, 

 and supports two rami, of which the longer is two-jointed, the first joint being long, 

 slender, and free from hairs, excepting one on the inner distal extremity, and represents 

 the future terminal joint of the peduncle, and the second is short, slightly tapering, and 

 tipped with two long hairs ; this joint represents the future ftagellum. The shorter 

 branch is as long as the first joint of the inner branch, it is also free from lateral hairs, 

 but bears five long ones at its tip. This branch represents the scaphocerite of the 

 permanent organ. 



The mandibles I have not been able to determine, but they appear to have no 

 synaphipod. 



The maxillae are also unknown to me except as viewed while attached to the 

 animal. 



The third pair of siagnopoda (g), or maxillipedes, consists of a six-lobed branch ; each 

 lobe increases in size posteriorly and is furnished with three or four strong hairs, as is also 

 the distal extremity of the appendage, which gradually tapers to a point. The outer or 

 convex margin supports a flattened lobe and is furnished with five or six long fine 

 hairs. 



The first pair of gnathopoda (h) is biramose ; the basal joint is broad and supports 

 the two branches, of which the inner is five-jointed, and supports a fasciculus of ciliated 

 hairs at the inner distal extremity of each joint, while the outer surface is smooth ; the 

 outer branch is single-jointed, nearly as long as the inner, and furnished along both 

 margins with a few isolated, ciliated hairs. 



The second pair of gnathopoda resembles the first in its general details. 



The first pair of pereiopoda is biramose, one branch being a little longer than the 

 other ; the longer is furnished with two long hairs at the extremity, while the shorter is 

 free from any. 



The succeeding pairs of pereiopoda are in a more immature condition, and in our 

 specimen consist of three pendulous saccular appendages, whereas in Claus's figure they 

 are longer and biramose, but still in a bud-like condition. 



The pleopoda are all wanting, except the sixth or posterior pair, which are large and 



(ZOOL. CHALL. EXP. PART LII. 18S6.) Fff 46 



