MONOGRAPH OF THE ATLANTIDAE. 



19 



by Souleyet, and I myself found a faint violet-blue colour 

 in some of Mr. Buiteudijk's specimens. 



A remarkable character of this species is also worth to 

 be mentioned. The animal in spirit-preservatiou, is always, 

 without exceptiou, of a greyish-white colour, whereas all 

 the other species of the A. peroni-growp, in the same con- 

 condition, exhibit a faint yellow tint. This difference in 

 colour enables to distinguish A. lesueuri at first sight. 



Group of Atlanta inflata. 



To this group I have referred three species : 



6. A. inflata Souleyet. 



7. ,, depressa 



8. ,, helicinoides ,, 



These species have a short conical spire with obtuse 

 apex, projecting beyond the last whorl, and generally 

 coloured; this tint, however, is not peculiar to the shell 

 itself, but to the gonad of the animal, which occupies the 

 hindmost part of the visceral mass, so beiug enclosed within 

 the apical whorls. The keel does not penetrate between inner 

 lip and penultimate whorl. 



Species 6. Atlanta inflata Souleyet. 



1852. Atlanta inflata Souleyet. 



1852. Atlanta quoyana? Souleyet, non Vayssière. 



1904. Atlanta inclinata Vayssière (his fig. 90), non Souleyet. 



(Plates 3 and 4, figs. 13—17). 



Dry shells : 



Atlantic Ocean, purchased 1907, 1 sp., Sowerby and Fulton. 

 Indian Ocean, „ „ G sp., „ 



Animals : 



Mediterranean, dale?, 6 sp., Buitendijk. 



Indian Ocean, February '04, 1 sp., „ 



„ January '06, 5 sp., „ 



„ April '06, 2 sp., „ 



Notes from the Leyden Museum, Vol. XXX. 



