28 



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 why 

 I regard A. gibbosa certainly as a distinct species. 



The following is a list of the species of the A tlan tidae 

 in the Leyden Museum : 



Oxygyrus keraudreni (Lesueur). 



„ rangi (Souleyet). 

 Atlanta peroni Lesueur. 



„ gaudichaudi Souleyet. 



„ lesueuri „ 



„ inflata „ 



„ depressa „ 



„ helicinoides „ 



„ turriailata d'Orbigny. 



„ fusca Souleyet. 



„ inclinata „ 



„ 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 

 ajinis 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 sufficiently verified, 

 and for that reason I feel justified in mentioning only the 

 following authors: 



Souleyet (»Bonite"). 



Smith (» Challenger"). 



Oberwimmer (»Pola"). 



Vayssière (»Hirondelle" and »Priueesse Alice"). 

 Tesch (»Siboga" and collection Leyden Museum). 



Notes from the Leyden Museum, Vol. XXX. 



