REPORT OX THE I80P0DA. 77 



to the longitudiual axis, and at tlie level of the end of the first joint of the 

 uropoda. 



The xiropoda are attached just l>efore the end of the anterior half of the caudal shield; 

 the exopodites are longer and reach very nearly up t(i the distal extremitv of the caudal 

 shield ; they are oval in shape, and terminate in a blunt extremity ; the outer margin is 

 serrated nearly as far as the articulation ; the eudopoditc is relatively broader, and ends 

 in a truncated notched extremity, the outer and the posterior margins are serrated ; no 

 hairs were found upon these appendages, but it is very prol)able that they may have 

 become detached. 



Station 162, April 2, 1874; lat. 39' 10' 30" S., long. 146° 37' R; 38 fathoms; 

 bottom, sand and shells. 



Station 163, June 3, 1874; off Port Jackson; 30 to 35 fathoms. 



16. Serolls minuta, F. E. P.. (PI. YII. figs. 2-6). 



Seroh's miimfa, F. E. Beddard, Proc. Zool. Soc. Lond., 1884, pt. iii. p. 3.37. 



The Challenger collection contains only one specimen of this species, which is a male , 

 and measures 5 mm. in length and 5 mm. in diameter ; this species, therefore, if 

 full grown, is the smallest known. 



In general shape Serolis minuta resembles very closely Serolls cornuta; the outline 

 of the body is almost circular, and the caudal shield projects only a little way beyond the 

 circle. A conspicuous keel runs down the middle of the body. 



The cephalic shield terminates in front in a short and stout rostrum; the anterior 

 portion, as iu most other species, is traversed l)y a ridge [cf. PI. VII. fig. 2) arising fi-om 

 the base of the rostrum ; the ridge is continued on to the epimera ; the posterior margin 

 is provided with three blunt tubercles, of which the middle one is the largest ; each of 

 the following segments is similarly produced into a Ijluut tubercle at the median point 

 of the posterior margin. 



Thorax. — Thej^>'.s'; thoracic segment is entire, and not separated into two portions by 

 a transverse line of division as is the case in so many other species. The dorsal surfoee 

 of the remaining segments is prolonged on either side into a triangular process which 

 slightly overlaps the succeeding segment ; these processes, which are hollow, serve for the 

 attachment of the muscles moving the limbs ; they are situated on the tergal portion of 

 the segment close to its junction with the epimeral portion ; while those of the tliird, 

 fourth, and sixth segments are the largest and most conspicuous. 



The tergal portion of the second, thinl, and fourth segments is separated by a distinct 

 suture from the epimera. The sixth segment is partially fused with the first abdominal 

 seo-ment, the suture which divides them being incomplete for a short space on either 

 side of the median line ; its epimera extend about as far as the first third of the caudal 



