280 DISCOVERY REPORTS 



similar to one another, but 2nd joint in 4th not so wide distally, 4th and 5th joints sub- 

 equal, 6th longer, lower margin of 6th minutely pectinate, and a few similar pectinations 

 on lower apical angle of 5th joint in peraeopod 4. Peraeopod 5 shorter than peraeopods 

 3 and 4, subequal to peraeopods 1 and 2, 2nd joint similar to that of peraeopods 3 and 4 

 but more ovate, being wider at base, and the longitudinal keel extends right to base, 

 5th shorter than 4th, 6th longer than 4th, lower margin of 6th minutely pectinate, and 

 a few pectinations on lower apical angle of 5th. Dactyls of peraeopods 1-5 all slender, 

 and there appear to have been a few pectinations on their inner margins near base, but 

 most of them are broken or rubbed off. 



Pleopods, peduncles very stout, quadrangular in cross-section. 



Uropods 1 and 2, peduncle stout, extending about one-third length of peduncle of 

 uropod 3, rami narrow lanceolate, the inner subequal to peduncle, the outer a little 

 shorter, outer margin of peduncle of uropod 1 minutely serrulate, of uropod 2 smooth. 

 Uropod 3, peduncle stout, about twice as long as broad, upper surface with a low 

 longitudinal ridge, margins smooth, rami ovate-lanceolate, the inner a trifle longer than 

 outer. Margins of all rami of all uropods minutely serrulate, except outer margin of 

 outer ramus of uropod 2 and outer margins of both rami of uropod 3 . 



Remarks. The beautiful and remarkable violet coloration of this species is well 

 shown in the figures on Plate I, reproduced from sketches made immediately after 

 capture. 



Genus Parathemisto, Boeck. 



Stebbing, 1888, p. 1407 (Euthemisto) and p. 1419. 



Bovallius, 1889, p. 248 (key to species) and p. 275 {Euthemisto, key to species). 

 Stephensen, 1923, p. 19 (Themisto, key to European species); 1924, p. 95 (Themisto). 

 Mogk, 1926, p. 65 (Themisto, analysis of compressa-bispinosa differences). 

 Barnard, 1930, p. 419 (synopsis of species). 



Parathemisto (Euthemisto) gaudichaudii (Guer.). 



Cunningham, 1871, p. 498 (Themisto antarctica Dana). 



Bovallius, 1889, p. 229, text-figs. 1-5; pi. xiii, figs. 44-46. 



Vosseler, 1901, p. 81, fig. 2; pi. viii, figs, n-17 (compressa) and p. 84, fig. 3; pi. viii, figs. 3-10 



(bispinosa). 

 Stewart, 1913, pp. 256, 257. 



Stephensen, 1923, p. 27, chart 6 (compressa); 1924, p. 103, figs. 43-49 (compressa and bispinosa). 

 Barnard, 1925, p. 374; 1930, p. 420. 

 Chilton, 1925, p. 180; 1926, p. 512. 

 Mogk, 1926, p. 65 (compressa and bispinosa). 

 Spandl, 1927, p. 165 (bispinosa). 



Occurrence: 1. St. 8. South Atlantic. 23 $$ 14-16 mm. (half sample). 



2. St. 9. South Atlantic (0-1250 m.). 23 $$ 10-17 mm. 



3. St. 24. South Georgia. 24 $$ 11-19 mm. (half sample). 



4. St. 26. South Georgia. 1 juv. 8 mm., 12 ?$ 13-16 mm. 



5. St. 33. South Georgia. 14 $$ 14-19 mm. 



6. St. 35. South Georgia. 7 $? 14-17 mm. 



