2 68 DISCOVERY REPORTS 



Occurrence: i. St. 2° 20' S, 12 45' W. 1 <$ 6-5 mm. 



2. St. 69. South-west Atlantic. 1 S 10 mm. 



3. St. 78. South Atlantic. 1 ? 10 mm. 



4. St. 87. South-east Atlantic. 3 SS 8-9 mm., 2 <J<J (penult, instar) 8 mm., 3 $? 

 8-9 mm., 2 juv. 6 mm. 



5. St. 89. South-east Atlantic. 3 S3 6-9 mm., 2 $? 7-8 mm. 



6. St. 103. South-east Atlantic. 1 $ 17 mm. 



7. St. 259. South-east Atlantic. 1 ? 14 mm. with embryos. 



8. St. 268. South-east Atlantic. 1 $ 8 mm. (penult, instar). 



9. St. 273. East mid-Atlantic. 1 <J 7 mm., 1 9 12 mm. (ovigerous, but all ova lost 

 out of pouch). 



10. St. 287. East mid-Atlantic. 1 ovig. ? 11 mm. 

 n. St. 296. East mid-Atlantic. 1 ovig. $ 12 mm. 



Remarks. The colour of no. 3 is given as " Of a glassy transparency, with, on either 

 side of head along lower edge, 12 vertical spindle-shaped scarlet spots, separating proximal 

 ends of ommatidia. A few red chromatophores at bases of last three legs and between 

 them". 



The ? no. 6 appears to be a record for size; Bovallius gives 15 mm. as the largest size 

 of ? clypeata, but the majority of recorded specimens are much smaller. It happens to 

 come from the most southerly of the localities, but the material is scarcely extensive 

 enough to suggest that the largest specimens are always to be found in the highest 

 latitudes. 



Distribution. Mediterranean; Atlantic, 42 N-37 S; Pacific Ocean. 



Family CYSTISOMATIDAE 



Stebbing, 1888, p. 13 17. 



Bovallius, 1889, p. 39. 



Woltereck, 1903, p. 447; 1904, p. 553. 



Stephensen, 1918, p. 56. 



Spandl, 1927, p. 170. 



Genus Cystisoma, Guer. 



Woltereck, 1903, p. 447; 19046, p. 553. 



Barnard, 1916, p. 286. 



Stephensen, 1918, p. 56 (key to species, and discussion of characters). 



Spandl, 1927, p. 170. 



According to the Nomenclatorial Rules, Stebbing's contention that Cystisoma must 

 be retained in its original spelling, and is therefore distinct from Cysteosoma and 

 Cystosoma, is perfectly just. Guerin's name stands as against Thaumops, W. Suhm, 

 emend. Thaumatops, von Mrtns. (cf. also Spath, Mem. Geo!. Sarv. India, ix, pt. 3, p. 163, 

 footnote, 1928). 



Of this genus it may well be said that we describe specimens, not species. There are 

 some ten or eleven nominal species, but the latest writers agree on the difficulty of 

 finding suitable diagnostic characters to define the species. 



