282 HELICINA. 



Sect. IV. Lirata, labro sinuoso, supra et infra dentato. — Genus 

 Lucidella, Swainson. 



The swelling of the labrum above and below, forms tooth-like 

 projections. These, together with the sinuous depression of the 

 upper part of the lip, contract the aperture in a peculiar manner. 



56. Aureola, .T'tr., (f. 94,479.) — Striata, subrotunda. — Stri- 

 ated, roundish. 



57. undulata, Pfr., (f. 92, 93.) — Undulatim striata. — TJndu- 

 lately striated. 



58. in^iqualis, Pfr., (f. 95.) — Angustata, elevata. — Narrow, 

 subconical. 



59. teidens, Shuttl., (f. 90, 91.) — Cariuata, labro tridentato. — 

 Keeled, outer lip three-toothed. 



Sect. V. Trochiformis, solida, spiraliter lirata. — Genus Trocha- 

 tella, Swains., inclusa. 



I have searched in vain for any definition of this section suffi- 

 ciently exclusive and inclusive to constitute it a logical or con- 

 venient genus. Pfeiffer and A. and H. Adams appear to rely 

 upon the absence of the basal callus or circular extension and 

 thickness of the inner lip, although those authors enumerate 

 among Troclialella. some species showing that character slightly, 

 and exclude great numbers of Ilelicina which have no more 

 callus than their most typical Trochatella. We must be content, 

 therefore, with uniting in a scarcely defined section the following 

 pyramidal, spirally grooved species : — 



60. sinuosa, Pfr., (f. 96.) — Labro sinuoso, labio interno cal- 

 lum posticum emittente. — Outer lip sinuous, inner lip with a 

 posterior callus. 



61. crassi-costata, Sowb., (f. 97.) — Crebre lirata, labro lami- 

 nate, columella recta. — Closely ridged, outer lip laminar, colu- 

 mella straight. 



62. virginea, Lea, (f. 98.) — Subglobosa, col. lata. — Sub- 

 globose, col. broad. 



63. globosa, Or., (f. 99.) — Rotunda, leviter lirata.— Bound, 

 lightly ridged. 



