2SO DISCOVERY REPORTS 



20. i. 26. South Georgia. From Humpback whale, ?. 13-55 "^- No. 387. Many specimens on 

 Coromila diadema. 



6. ii. 26. South Shetland Islands. From Humpbacli whale (a very white specimen). Many 

 specimens on Coronula diadema. 



23.vii. 26. Durban. From Humpback whale. No. D 3. Many specimens on Coronula 

 diadema. 



5. ix. 26. Saldanha Bay. From Blue whale, ?. 21-3 m. No. 1065. One large specimen on 

 Coronula reginae, on mandible of whale. 



15. xi. 26. South Georgia. From Blue whale, ?. 25-1 m. No. 1196. Two fully grown specimens 

 from baleen plate. (Plate I, figs, i, 2.) 



13. iv. 27. Deception Island. From Fin whale. One fully grown specimen on tail. 



29. i. 27. South Shetland Islands. From Fin whale. Many specimens from baleen plates. 

 (Plate I, fig. 3.) 



29. vi. 27. Simon's Town. From ship's side. One specimen. 



Distribution. Cosmopolitan and pelagic, on Coronula attached to whales, on teeth 

 and baleen plates of whales. Also situated on such objects as fishes, eels, ships and 

 buoys. 



Supplementary Description. TJhis species, which was collected from ten sources, 

 is the best represented in the collection. To the previous descriptions, especially that 

 of Darwin (1851), not much need be added. Some remarks regarding this material, 

 however, may be made. 



The largest specimen I have seen was among those collected on January 29, 1927, from 

 a Fin whale in the South Shetlands. Its measurements were: length of capitulum 

 60 mm., breadth 33 mm.; length of peduncle 76 mm., breadth 15 mm. Darwin's largest 

 individual measured 125 mm. in total length. Broch (1924) mentions a specimen with 

 a capitulum of 35 mm. in length. Otherwise individuals of all sizes down to 6 mm. in 

 total length are represented in the material. 



As regards the colour, the same observation may here be made as that made by 

 Cornwall (1927), namely, that specimens situated on black objects, as for instance on 

 the dark tail of a whale, are almost black. 



The five plates are well developed in small and medium sized specimens. We find 

 five plates also in a large specimen having a length of capitulum of 47 mm., a breadth of 

 22 mm., a length of peduncle of 42 mm., and a breadth of 11 mm. This individual has 

 a carina of only i mm.inlength,atergum 5 mm. in length, and a scutum 11 mm. in length. 

 But great variation seems to exist, and one finds small specimens in which the terga 

 and carina have disappeared. According to Broch (1924) the terga disappear before 

 the carina, and in this material I have found the same feature. In many specimens, 

 however, the carina is reduced before the terga. In large individuals the terga and 

 carina are lost. 



The peduncle is in many individuals widely expanded in the basal part, as in the 

 large specimens from a Fin whale in the South Shetlands in January 1927. This widely 

 expanded surface of attachment has already been mentioned by Darwin (1851, p. 144). 



