NO. 17li!>. 



ISOPODS I'L'OU PERI UK' II [RDSON. 



81 



long, 7 mm. by 13 nun. The post-lateral angles are rounded and the 

 posterior margin straight. The uropoda arc a little longer than the 

 terminal abdominal segment. The inner branch is slightly longer 

 than the outer branch. Both are narrow, elongate, and produced 

 to acute and tapering extremities. 



The legs are all prehensile, and terminate in short, stout dactyli. 

 There is a high carina on the basis of the last four pairs of legs, the 

 carina, increasing in height from the fourth to the seventh pair, 

 where it is extremely high." 



SPHjEROMA PERUVIANUM, new species. 



Body oblong-ovate, covered with small granules, which on the 

 abdomen become much more numerous and larger, more like tubercles. 



Head large, wider than long, with the front produced in a small 

 median point. Two small tubercles are situated dose to the anterior 

 margin, one on either side of the median line. 

 The eyes are placed in the post-lateral angles 

 and are large and composite. The first anten- 

 nae have the first article twice as long as 

 wide ; the second article is half as long as the 

 first; the third is slender and is about as long 

 as the first two taken together; the flagel- 

 lum is composed of eleven articles and ex- 

 tends to the middle of the lateral margin of 

 the first thoracic segment. The second an- 

 tenna 1 , with a flagellum of nineteen articles, 

 extend to the posterior margin of the second 

 thoracic segment. The first maxilla has the 

 inner lobe furnished with four plumose pro- 

 cesses, the outer lobe with thirteen spines, 

 eight long and five short ones. The mandible 

 has the apical tooth trifid. ■ 



The segments of the thorax, with the ex- j 

 ception of the first, have a transverse tuber- 

 culated ridge. The seventh segment is fur- 

 nished with four large tubercles in a transverse line, two on either 

 side of the median line. The lateral parts of all the segments are 

 produced in harrow triangular lobes, with, rounded extremities. 



The first segment of the abdomen has two large tubercles, one on 

 either side of the median line, and two smaller ones on either side of 

 these, making six in a transverse row. The terminal segment is 

 broadly rounded posteriorly, with the apex slightly truncate. On 

 the anterior portion are six prominent tubercles, four in a transverse 



a For description of the male, female, and young of the first ee Schioedte 



and Meinert, Nat. Tidsskr. (3), vol. 13, L883, p. 335. 



Proc.N.M.vol.38— 10 G 



I. : .— Sl'II.EROM.V PERUVIANUM. 



5J. (Drawn by Miss v. Dan- 

 dridge.) 



