2s8 DISCOVERY REPORTS 



Terga, said by Pilsbry (191 6) to be wanting, by Cornwall (1927) to be present in the 

 small individuals. In this material they are found in small and rather large specimens. 



I dissected some specimens of C. diadema and C. reginae and did not find the differences 

 given by Broch (1924) between the mouth-parts, especially the mandibles. I refer here 

 to Nilsson-Cantell, p. 16, 1926. Cornwall (1927) gives some differences in the number 

 of spines in the longer cirri, for he found in C. diadema up to five pairs of spines, and in 

 two dissected C. reginae three pairs in a smaller specimen and three longer pairs and 

 one small pair in a larger specimen. As in Balaims we often find some differences in 

 this character, which depends on age, and I think it has no great importance. Yet I will 

 not for the present deny the possibility that two different but nearly related species exist. 



The present specimens were taken from Blue whales. Fin whales, and Humpbacks, 

 hosts previously recorded. 



Genus Xenobalanus, Steenstrup, 185 1 

 Xenobalanus globicipitis, Steenstrup, 185 1. 



For synonymy see Nilsson-Cantell, 1921, Zool. Bidrag Uppsala, vn, p. 375. 



27. X. 25. 14° 45' 00" N, 18° 34' 00" W. Four fully grown specimens and one small specimen 

 on the tip of flipper of a whale (species not given). 



16. viii. 26. Saldanha Bay, South Africa. From Sei whale, ?. 10-45 m. No. 952. One fully grown 

 specimen. 



20. viii. 26. Saldanha Bay, South Africa. From a Fin whale, (J. 14-1 m. No. 973. Many speci- 

 mens on tail, fluke, etc. 



2i.ix. 26. Saldanha Bay, South Africa. From a Blue whale, ?. 16-82 m. No. 1 104. One small 

 specimen on the tip of flipper. 



4. X. 26. Saldanha Bay, South Africa. From a Blue whale, cj. 17-1 m. No. 1169. Seven fully 

 grown specimens from the flukes. 



13. iv. 27. Deception Island, South Shetlands. From a Fin whale. Several basal plates on the 

 tail. 



Distribution. Probably cosmopolitan, on the skin of porpoises, dolphins and whales. 



Supplementary Description. The species is here represented by several specimens 

 from six different stations. Its morphology is already well known and seems not to vary 

 much. Yet these finds are of great biological and zoogeographical interest. Before 

 Caiman (1920) this species was only noted from the North Atlantic Ocean. This author 

 describes specimens from the Antarctic (South Shetland Islands). Later, Barnard 

 (1924) describes specimens from other southern localities (Natal and Saldanha Bay, 

 South Africa). Stebbing's species, X. natalensis, 1923, from the same catch, is held by 

 Barnard to be typical X. globicipitis. As Cornwall (1927) describes some specimens from 

 the Northern Pacific (Vancouver Islands, B.C.) the species, like other whale parasites, 

 might have a very wide distribution: it might be said to be cosmopolitan. All the 

 material here collected is from Antarctic waters, which shows that the species is rather 

 common there, perhaps as much so as in northern seas. 



