REPORT ON THE CRUSTACEA MACRURA. 



829 



meres being probably united together, and the propodos suddenly truncated to a 

 triangular point. 



The first two pairs of pereiopoda are subequal, the second pair being rather the longer 

 and more slender, and the three posterior pairs have the propodos long and slightly 

 cylindrical ; the dactylos is styliform in the third and fourth, and almost obsolete in the 

 ultimate pair, where it is surrounded by a brush of ciliated hairs on the anterior surface 

 of the propodos and a row of spinules on the posterior. 



The rhipidura has the outer plate longer than the inner, and is furnished with a tooth 

 on the outer margin corresponding with the diaeresis. 



Notostomus perlatus was taken at the same station associated with this species, and it 

 is difficult to realise that it is not the same species, but there are certain features peculiar 

 to one and not to the other, and which I do not suppose to depend upon sexual difference. 



Notostomus murrayi, n. sp. (PI. CXXXIV. fig. 3). 



The dorsal surface is less arched than in the two previous species, and the rostrum is 

 longer, reaching quite or nearly to the extremity of the scaphocerite ; the denticles are 

 comparatively larger and more numerous on the frontal crest, and on the upper and lower 

 surfaces of the rostrum. There are only two lateral carinae, the orbital and the outer 

 antennal. the semicarina being absent. 



The telson is shorter than the outer plates of the rhipidura. 



Habitat.— Station 133, October 11, 1873; lat, 35° 41' S., long. 20° 55' W.; near 

 Tristan da Cunha ; depth, 1900 fathoms ; bottom, Globigerina ooze ; bottom temperature, 

 35° '4. One specimen. Trawled. 



This species corresponds in many points with Notostomus elegans, A. Milne-Edwards, 

 but it differs in having the rostrum not longer than the scaphocerite, while in Notostomus 

 elegans it is stated to be twice as long, and in there being only some ten or twelve teeth 

 on the lower surface of the rostrum instead of eighteen, those on the upper surface being 

 continuous with those on the dorsal carina and persistent to the posterior margin of the 

 carapace ; those on the higher parts of the arch are less conspicuous, from wear, than 

 those at the frontal and posterior regions. 



