REPORT ON THE CRUSTACEA MACK UK A. 657 



stylocerite that is co-equal with the joint in length ; the second and third joints are 

 short, cylindrical, and fringed with hairs, supporting at the distal extremity two slender 

 flagella that are subequal in length. 



The second pair of antennae carries a scaphocerite that does not extend to half the 

 length of the rostrum, and a flagellum that is about half as long again as the animal. 



The mandible has the psalistoma well developed, and the synaphipod has the distal 

 joint of greater diameter than the basal. 



The other oral appendages offer no marked features to distinguish them from those of 

 the other species. 



The first pair of gnathopoda corresponds in general with the preceding, but has the 

 three terminal joints distinguishable from each other, and the podobranchial plume is 

 reduced to a rudimentary condition. The second pair is tolerably robust, has the 

 basecphysis well developed and the rigid plate at the base ovate. 



The pereiopoda are slender and rather short. The first pair has the carpos on the 

 right side longer than on the left. The second pair has the appendage on the left side 

 shorter and more robust than that on the right. The posterior three pair have the spines 

 on the meros few and distant ; the propodos is considerably longer than the carpos, 

 and the dactylos is long, slender, sharp-pointed, and furnished at the base with several 

 small spines. These three pairs of pereiopoda diminish in length posteriorly. 



The first pair of pleopoda has the inner and anterior branch in the male developed in 

 the form of an ovate, membranous petasma. 



The rest of the animal offers nothing very conspicuous to distinguish it from others of 

 the genus. 



The male is more slender and smaller than the female, being only about two-thirds of 

 its length, and the rostrum is proportionately longer, being about one-third the total 

 length of the animal in the female, and half the length in the male. 



Nothocaris ocellus, n. sp. (PI. CXIV. fig. 3). 



Carapace having the dorsal surface posterior to the gastric region smooth, anteriorly 

 depressed, and laterally compressed into a carina that commences on the gastric region 

 and is produced anteriorly to a long rostrum, which is armed on the upper margin with 

 two small spines at the posterior extremity, five or six conspicuous teeth, and six 

 or seven considerably smaller extending to the apex ; on the lower margin there are 

 six small teeth near the apex, and the posterior portion is smooth and fringed with 

 long hairs. 



Ophthalmopoda short, pyriform, having a distinct ocellus posterior to the 

 ophthalmus. 



(ZOOL. CHALL. EXP. PART LII. 1887.) Fff 83 



