58 ANCILLAIUA. 2. 



ceases at various distances above that suture, in most cases form- 

 ing a marginal band on the upper part of the last whorl. Sec- 

 tion III., Sp. 42 to 44, A. glabrata and its two allied species, 

 which, agreeing with the last group as to the enamel, present the 

 additional characters of a divided varix, and an oblique umbilicus 

 between the body-whorl and the columellar callus. 

 ShImj. Dipsaceus, Klein. 



Sect. I. Spire-covering enamel extended over the body -whorl. 



1. torosa, Meusch. — Mauritiana, Sowb. Sp. Con. — A. subcy- 

 lindrica, longitudinaliter striata, castanea, seu pallide fulva, sen 

 alba ; spira brevi ; anfractibus subquadratis, balteo inferiori sim- 

 ]ilice; apertura, magna, ad basin lata, vix emarginata; varice 

 albo, leviter striate, elongate (f. 30, 31, 32). — This now well- 

 known species is remarkable for the width and length of the 

 aperture in proportion to its very short spire. The three varie- 

 ties are common in collections. 



2. aperta, Sowb. Sp. Con. — A. subcylindrica, laevis, aurantio- 

 rubra ; spira brevissima ; anfractibus rotundis, balteo inferiori 

 simplice ; apertura magna, ad basin vix emarginata ; varice albo, 

 leviter striate, elongate (f. 27, 28). — This species, which differs 

 from A. Mauritiana in being smooth and having rounded whorls, 

 is very rare. I am indebted to the kindness of Mrs. De Burgh 

 for the use of the beautiful specimen figured. 



3. scaphella, Sowb. Th. — A. cylindrica, alba ; spira brevi ; 

 apertura magna, ad basin vix emarginata ; varice lcevi, elongate, 

 balteo inferiori vix distincto ; sutura inferiori elevata (f. 37, 38). 

 — Resembling the two preceding in form, but more cylindrical, 

 white, and smooth. The basal suture, which is obsolete in 

 Sp. 1 and 2, is here distinct, giving an angularity to the lines of 

 growth, and ending in a scarcely perceptible projection. Unique 

 as far as known. 



4. cylindrica, Sowb. Th. — A. cylindrica, parva, alba, A. sca- 

 phella similis, sed magis augustata et recta (f. 18, 19). — A small 

 white shell, more cylindrical, straight, and narrow than A. sca- 

 phella. Unique as far as known. 



5. Tronsoni, Sowb. Th. — A. subovalis, politissima, alba; 

 spira brevi ; apertura elongata ; sutura inferiori subcallosal, balteo 

 inferiori simplice; varice brevi, striate, canali post varicem posi- 

 to (f. 20, 21). — Having something of the form of A. scaphella, 



