Suter.— Genus Isidora. 333 



Polypus campbelli, E. A. Smith (1902). 



" Report on the Collections of Natural History made in the 

 Antarctic Regions during the Voyage of the ' Southern 

 Cross,' " 1902, vii, Mollusca, by Edgar A. Smith, F.Z.S., 

 p. 201, pi. xxiv, figs. 7-11. 



The specimen described is a male. Mr. Smith mentions 

 that the right dorsal aim is shorter than the left, probably 

 bitten by a fish or crustacean. I have a female specimen, also 

 from Campbell Island, which shows the very same peculiarity, 

 and proves that it is not accidental, but must be considered 

 as characteristic of the species. 



EXPLANATION OF PLATE XVIII. 



Chiton huttoni, Suter. Natural size. 



,, ,, Head, median, and tail valves ; enlarged. 



,, „ Side view of tail-valve : enlarged. 



,, „ < Girdle-scales, much magnified 



Helcioniscus mestayerce, Suter. Natural size. 

 Fig. 10. Columbella pseute-s, Suter. Photo from type. 



Art. XXXIX. — Genus Isidora: Correction of Article XVI. 

 in Last Year's Transactions (Volume XXXVII). 



By Henry Suter. 



: Plate XIX. 



Through an unfortunate mistake the figures of Isidora species 

 in the text are inversed, representing dextral instead of sinis- 

 tral shells. The editor, Mr. A. Hamilton, very kindly consented 

 to have them reprinted, showing the correct sinistral volution 

 of the whorls. 



