— 156 — 



paulo latior, pone limbum albida, intus et ad basin rosea; 

 margo columellaris intus vix uniplicatus, externus subob- 

 tuse acutus, ad limbum obsoletissime plicato-crenatus^ 

 in vicinio suturœ mediocriter emarginatus. — Long. 60, 

 diam. maj. 33 mill. Apertura 55 mill. longa, 7 lata. (Coll. 

 Marie.) 



Hab. Nouméa, Novœ Caledoniœ. (E. Marie.) 

 Obs. Forma typica, a Sowerbyo nuperrime pessime 

 descripta sed bene figurata^differt fasciis^-4 transversis, 

 mediocriter conspicuis anfractus ultimi. 



Genus novum HETEROCYCLUS, Crosse, 1872 (1). 



Testaperforata, scalariformi-turrita, tenuiuscula ; anfr. 

 pauci, ultimus descendens, sohUus, liber; peristoma sim~ 

 plex, subirregulariter circulare, marginibus leviter 

 incrassatis. 



Operculum subcirculare, tenue, cartilagineo-corneum, 

 infra planiusculum, supra arctispirum, medio concavius- 

 culum; nucleo centrali; margine externo anfractuum pro- 

 minuloj libero, ad terminum anfr. ultimi attenuato. 



Obs. Genus testa turrita a Cyclophoris discrepanset oper- 

 culi forma peculiari inter gênera Cyclophorum et Pterocy- 

 clum quasi mediiim, sed ab utroque bene distinguendum. 



3. Heterocyclus Perroquini, Crosse. 



T. perforata, breviter scalariformi-turrita, sublœvis, 

 haud nitens, tenuiuscula subtranslucida, sordide luteo- 

 albida; spira turbinato-turrita, apice obtusulo ; sutura 

 impressa; anfr. 4 convexi, sensim accrescentes, ultimus 

 valde descendens, solutus, liber; apertura subirregulariter 

 circularis, intus concolor; peristoma simplex, marginibus 



(1) Étymologie : 'ÎTspof diversus, kvk?^oç circulus. 



