272 DISCOVERY REPORTS 



33 S, 17 E (coalitum, ' Valdivia ') ; 33^-° S, 28 E (africanum, 'Pieter Faure'); and 

 35^° S, 8° E {magnum and pellucidnm, 'Gauss'). The 'Discovery' has extended the 

 known southerly limit to 57— 58 S (Drake Strait) for the species fabricii. 



Cystisoma pellucidum (W. Suhm). 



Stephensen, 1918, p. 64, figs. 19, 24-27. 



Occurrence: 1. St. 41 ° 37' N, 12 30' W. 1 adult $ 66 mm. (incl. uropods 75 mm.). 



2. St. 13° 25' N, 18° 22' W. 1 ? probably about 70 mm. (pleon and uropods missing). 



3. St. 6° 55' N, 1 5 54' W. 1 immat. 40 mm. 



4. St. 78. South Atlantic. 1 juv. 1 1 mm. 



5. St. 281. East mid-Atlantic. 1 immat. 30 mm. 



6. St. 295. East mid-Atlantic. 1 adult ? 70 mm. (incl. uropods 85 mm.). 



Remarks. There are five pairs of ventral spines, except in no. 1 where there are five 

 spines on the left side, six on the right, and in nos. 2 and 4 where there are only four 

 pairs. Nos. 1 and 6 have the elongate outer rami to the uropods and the enlarged antennae 

 and 6th joint to peraeopod 5. The antennae are about the same length as the head, except 

 in no. 2 where they are distinctly shorter (13 : 20) ; they are 6 mm. apart, except in no. 3 

 where they are only 3 mm., the antennae and head of the latter both measuring 11 mm., 

 and in no. 4 where they are 2 mm. long and 1 mm. apart. 



A remarkable feature of nos. 1 and 6 is the presence of numerous minute Copepods 

 within the body; they occur in all parts of the body, in no. 1 even within the peduncles 

 of the pleopods and the basal (2nd) joints of peraeopods 4 and 7. Their presence has 

 not been noticed by other authors, and they are not present in africanum (which I have 

 re-examined), or the other large Discovery $ no. 2. The only explanation I have to 

 suggest is that nos. 1 and 4 were " spent" ?? and were mere dead skins when captured, 

 the minute Copepods having entered the bodies in the role of scavengers. 



Whether W. Suhm's species should be identified with " spinosum" of Fabricius 

 and/or Guerin is impossible to say, and it seems best to drop the name "spinosum" 

 altogether. 



Distribution. North Atlantic, 48°-35°N; Indian Ocean, o° 58-4; 1 - S. 1280- 

 4000 m. 



Cystisoma fabricii, Stebb. 



Stephensen, 1918, p. 63, figs. 22, 23. 



Occurrence: 1. St. 13 25' N, 18 22' W. 2 $$ 65 and 66 mm. (incl. uropods 72 and 76 mm.), 

 3 immat. 34, 40, and 48 mm. 



2. St. 6° 55' N, 1 5 54' W. 2 immat. 25 and 40 mm. 



3. St. 71. South-west Atlantic. 1 immat. 35 mm. 



4. St. 81. South Atlantic. 1 $ 52 mm. (no genital papillae or median ventral spine). 



5. St. 216. Drake Strait. 1 juv. 21 mm. 



6. St. 219. Drake Strait. 1 juv. 23 mm. 



7. St. 276. East mid-Atlantic. 1 juv. 17 mm. 



8. St. 281. East mid-Atlantic. 1 $ 70 mm. 



9. St. 287. East mid-Atlantic. 1 immat. 38 mm. 



10. St. 297. East mid-Atlantic. 1 immat. 31 mm., 1 juv. 13 mm. 



