734 THE VOYAGE OF H.M.S. CHALLENGER. 



joints longer, the fourth pair of i^crseopods being the longest, while the fifth is the 

 shortest. 



Fifth Perseopods. — Side-plates small. Branchial vesicles well developed. First 

 joint of the limb shorter in front than that of the preceding pair, but longer behind, 

 the lower well-rounded lobe being produced considerably below the second joint ; the 

 third joint is shorter than the fourth or fifth, with small groups of spines or sette 

 on Ijoth margins ; the fourth joint rather longer than the fifth, with the hind margin 

 nearly straight, with an apical group of small spines, and one higher up, the front 

 margin strongly serrate, armed with many groups of long spines ; the fifth joint straight, 

 with five sets of small spines behind, and nine or ten groups of spines, large and small, on 

 the serrate front margin ; the finger straight. 



Uropods. — The peduncles of all three pairs are very long, much longer than the 

 rami, reaching nearly equally far back, the first pair shghtly further than the thii-d and the 

 third than the second ; they are carinate below and channelled above, with small spines 

 along the upper edges, and in the first j^air with setse at the upper part ; the rami are 

 lanceolate, subequal, with the outer margin of the outer and the inner of the inner ramus 

 nearly straight, the other two being more convex, all edged with small spines, and each 

 ha'S'ing a nail at the apex, which seems to be of no very rigid texture. 



Tdson very small, the length very little exceeding the breadth, the shape almost 

 triangular, with curved sides, cleft for a short distance, the apices rounded, scarcely 

 dehiscent. 



Length. — The two specimens are figured in the Plate of the natural size, the larger in 

 the position figured measuring in a straight line from the forehead to the extremity of the 

 third uropods just two inches, with a depth at the third perseon-segment of an inch and 

 a half ; the smaller specimen, being extended, measured within the same points over an 

 inch and a half in length, with a depth of seven-tenths of an inch. 



Locality. — Station 146, near Marion Island, December 29, 1873; lat. 46° 46' S., 

 long. 45° 31' E.; depth, 1375 fathoms; bottom, Globigerina ooze; bottom temperature, 

 35°'6. One specimen (the larger). Trawled. 



Station 147, east of Marion Island, December 30, 1874; lat. 46° 16' S., long. 

 48° 27' E.; depth, 1600 fathoms; bottom. Diatom ooze; bottom temperature, 34°'2. 

 One specimen (the smaller). Trawled. 



Remarks. — The specific name refers to the striking difference in size between this 

 and the earlier known species of the genus, which range from little more than the fifth 

 of an inch down to the tenth of an inch. Boeck's Andania ahyssi, it may be noted, is 

 reported from depths between 100 and 300 fathoms. 



