SYSTEMATIC REPORT 95 



by the very long exopods of the uropods ; and by its large size. P. belgicae is larger than any other 

 species of the genus which has been recorded. The four whole specimens from station 181 are imma- 

 ture and measure more than 20 mm. The male from station 182 is not fully adult and measures 23-5 mm. 

 The females from station 1644 are not breeding, although they seem to be adult. The female from 

 station 181 is adult but, unfortunately, the posterior portion of the body is missing. From the propor- 

 tions of the anterior end, I think that the animal must have measured about 30 mm. Hansen (191 3, 

 p. 12) recorded a male specimen measuring 27 mm. 



P. frigidum is the only other species of the genus to attain a comparable size, but it can be 

 distinguished from P. belgicae by the marked serrulations on its eyeplate and by the considerably 

 elongated apex of the antennal scale. 



Distribution. This species is an entirely antarctic form with a circumpolar distribution in rela- 

 tively shallow waters. It was first recorded from 78 25' 40" S., 165 39' 6" E. (Holt and Tattersall, 

 19066, p. 8) and has since been taken by 'Belgica' and by the Swedish and German Antarctic 

 Expeditions in depths between 150 and 400 m. The type specimen was taken at 300 fm. In his 

 'Challenger' Report, G. O. Sars (18850, p. 191) recorded a large damaged female specimen and, when 

 referring it to P. sarsi, noted that it was much larger than recorded specimens of that species. It is 

 possible that this specimen was really P. belgicae. If this is the case, this species can occupy much 

 greater depths than any at which succeeding records have occurred since the Challenger specimen 

 was taken from 1675 ^ m - 



Pseudomma calmani sp.n. 



Occurrence: ^ °' 



St. 51. 4. v. 26 (day). East of Falkland Is., 105-115 m., two tubes: (i) 3 ?? (dried up); (ii) 1 ?, 7-6 mm. 

 St. WS 215. 31. v. 28 (dusk to dark). North of Falkland Is., 219-146 m., 1 adult ?, non-breeding, 6 mm. 

 St. WS 219. 3. vi. 28 (day). North of Falkland Is., 116-114 m., 1 S, 6 mm., 5 $?, breeding, 6 mm. 

 St. WS 226. 10. vi. 28 (day). North-west of Falkland Is., 144-152 m., 1 ?, with empty brood sac, 7 mm. 

 St. WS 229. 1. vii. 28 (day). North-east of Falkland Is., 210-271 m., 1 <J, 7 mm., 2 $?, 7 mm., 2 damaged $$, 



abdomen of adult $. 

 St. WS 235. 6. vii. 28 (day). North of Falkland Is., 155-155 m., 1 imm. ?, 5-8 mm. 

 St. WS 758. 12. x. 31 (night). North of Falkland Is., 94-0 m., 2 very damaged specimens. 

 St. WS 767. 19. x. 31 (night). North of Falkland Is., 98(-o) m., 1 <J, 7 mm., 1 fragment. 



St. WS 772. 30. x. 31 (day). North of Falkland Is., 309-163 m., 8 $$, 7-7-5 mm., 3 imm. <?& 2 ?$, 7 mm. Types. 

 St. WS 775. 2. xi. 31 (day). North of Falkland Is., 115-110 m., fragments. 

 St. WS 801. 22. xii. 31 (day). North of Falkland Is., 165-165 m., 1 ?, 8 mm. 



Description. General form short and compact with the anterior end relatively more robust than in 

 other species of the genus. Carapace not greatly emarginate posteriorly. Antenmdar peduncle short 

 and thick, especially in the male ; third segment longer than the first and second segments together. 

 Male lobe large and very densely hirsute in the adult (Fig. 16 A). Antennal peduncle slightly longer 

 than the antennular peduncle and rather more than half as long as the scale. Scale more than 

 twice as long as the antennular peduncle, 3^ times as long as broad, apex produced well beyond 

 the tooth terminating the outer margin and occupying one-fifth of the total length of the scale 

 (Fig. 16A, B). Eyeplate with well-marked median anterior cleft. No trace of serrations or teeth on 

 the anterior lateral margins (Fig. 16C). Thoracic endopods as described for the genus, except that the 

 articulation between the carpus and the propodus appears to be quite transparent and not oblique, 

 when the limb is not flexed at the joint. The nail is setiferous and very long (Fig. 16 D-E). Male 

 genital organ very large, cylindrical and tipped with a short, strong curved seta (Fig. 16 D). Fourth 

 pleopod of the male with the exopod seven-segmented and slightly longer than the six-segmented 



