REPORT ON THE CRUSTACEA MACRURA. 663 



There is nothing remarkable in the form of the pleopoda to distinguish them from 

 those of other species, excepting perhaps in the posterior pair, which is armed at the 

 outer angle of the diaeresis with a fixed tooth and a movable spine. 



The telson corresponds with that of most other species, although it is not quite so 

 Hat on the dorsal surface as in some of them, and has a spine or two on the dorso-lateral 

 angle and spines and hairs at the terminal extremity. 



Observations. — This species is evidently identical with that which has been figured by 

 A. Milne-Edwards as having been taken during the expedition of the " Travailleur " in 

 July 1882, in the Bay of Biscay, at a depth of 1350 metres. There are, however, slight 

 differences between the two forms. Our specimens have invariably eleven or more teeth 

 and five or six spines on the dorsal crest and upper margin of the rostrum, whereas 

 A. Milne-Edwards' drawing shows six of the latter and only eight of the former on the 

 upper margin, while the distal extremity is smooth, and the lower corresponds with that 

 of the Barra Grande specimens. The three posterior pairs of pereiopoda in our specimens 

 are also longer than in that of A. Milne-Edwards, since in ours the carpal extremity of 

 the meros reaches quite to a level with the apex of the rostrum. The posterior projection 

 of the dorsal surface of the third somite is not so conspicuous as that figured by 

 A. Mdne-Edw T ards. These variations in the details may perhaps depend upon the 

 draughtsman's want of accuracy, or they may be correlated with a different, 

 habitat. 



Nothocaris spiniserratus, n. sp. (PI. CXXXII. fig. 1). 



Carapace anteriorly carinated and produced to a rostrum that is equal with it in length. 

 The crest is armed with three movable spines and the rostrum with three rigid teeth, of 

 which the most anterior is placed about the middle of the rostrum ; apex of rostrum 

 bidentate, the upper tooth being the smaller ; lower margin convex and armed with three 

 minute teeth. 



Pleon smooth, with the third somite strongly arched, the fifth somite longer than 

 the fourth, and the telson long, narrow and subequal with the lateral plates of the 

 rhipidura. 



Ophthalmopoda pyriform, and furnished with a distinct ocellus. 



First pair of antennae reaching a little beyond the extremity of the rostrum. 



Second pair of antennas nearly as long as the animal, and furnished with a scapho- 

 cerite that is equal with the rostrum. 



Second pair of gnathopoda robust. 



First pair of pereiopoda slender. Second pair having a long, slender, and multi- 

 articulate carpos ; the posterior three pairs of pereiopoda carrying a long and slender 

 dactylos. 



