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MONOGRAPH OF THE ATLANTIDAE. 



some Atlanta, as the large, elevated, conical spire, which 

 gives to the shell a rather regular (and so in Atlanta 

 very uncommon) appearance, is much like that of larval 

 forms. Formerly (monograph, p. 60) I have pointed out v^hy 

 I regard J. gibhosa certainly as a distinct species. 



The follovring is a list of the species of the A tlantidae 

 in the Leyden Museum : 



Oxygyrus keraudreui (Lesueur). 



„ rangi (Soiileyet). 

 Atlanta peroni Lesueur. 



„ gaudichaudi Souleyet. 



„ lesueuri „ 



„ inflata „ 



„ depressa „ 



„ helicinoides „ 



„ turriculata d'Orbigny. 



„ fusca Souleyet. 



„ imlinata „ 



„ gibbosa „ 



So the Museum possesses ] 2 of the 15 species I have 

 accepted in this paper. Absent are Protatlanta souleyeti 

 (Smith), Atlanta steindaclmeri Oberwimmer and Atlanta 

 ajffinis Tesch. 



Horizontal Distribution, 



With the information now available it seems possible to 

 add a few notes about the horizontal distribution of the 

 Atlantidae. It seemed advisable to me to reject such notes, 

 distributed in literature, which are not sufiScienlly verified, 

 and for that reason I feel justified in mentioning only the 

 following authors: 



Souleyet (»Bonite"). 



Smith (» Challenger"). 



Oberwimmer (»Pola"). 



Vayssiere (»Hirondelle" and »Princesse Alice"). 

 Tesch (»Siboga" and collection Leyden Museum). 



PJotes from the Leyden Mluseuxxi, Vol. XXX. 



