336 Mr. T. D. A. Cockerell's Notes on Slugs. 



vi. St. Helena. 

 Amalia gagates (var. ascensionis), forma nov. helence. 



Mantle 7 millim. long (in alcohol), 5 millim. broad ; sole 

 3^ millim. broad. Respiratory orifice 5 millim. from anterior 

 border of mantle. Colour dull palish ochrey, back darkish 

 purplish grey ; mantle purplish grey, except sides below 

 sulcus, which are pale ochrey, rather sharply defined from the 

 dark part by the sulcus. Neck bluish grey above. Body 

 keeled strongly its whole length. Median area of sole not 

 quite twice as broad as either lateral area. Sole with strong, 

 transverse, oblique grooves meeting in the middle line. Body 

 simply reticulate-grooved, but the interstices themselves finely 

 reticulate-grooved. Keel not obviously paler than the back. 

 Sides of sole with transverse grooves and one longitudinal 

 groove. 



St. Helena (/. C. 3Ielliss) ; one specimen in British 

 Museum. 



Compared with subsp. plumbea from South Shields it is 

 evidently very closely allied; but the median area of the sole 

 is narrower. Its rugosity may partly be due to strong alcohol 

 having produced extreme contraction. 



vii. Tristan d'Acunha. 



Amalia gagates (var. ascensionis), forma nov. tristensis. 



Sole and sides yellowish, back and mantle plumbeous ; 

 rugae rather strong. 



Tristan d'Acunha (' Challenger ' coll.) ; one specimen in 

 the British Museum. 



This is very near to subsp. plumbea and still nearer to form 

 helence. It is not confined to Tristan d'Acunha, being also 

 found in Juan Fernandez. It is most instructive to find that 

 an apparently introduced species has varied in the same way 

 on two islands so far apart as these, but at approximately the 

 same latitude and with probably very similar climates. The 

 St. Helena form, from a warmer climate, is not identical, but 

 still very closely allied. It is also to be noticed that the 

 forms of the south temperate region come to resemble the 

 plumbea of North-western Europe, while those from inter- 

 mediate localities are different. 



c. The Cape Region. 



Amalia capensis (Krauss). 

 Limax capensis, Krauss, Siidaf. Moll. 1848, p. 73. 

 Whether this is really a species of Amalia peculiar to the 



