12 GUDE : NINE NEW SPECIES OF HELICOID LAND SHELLS. 



Thalassia cyrtoehila, n. sp. 



PI. iii, figs. 2a — 2b. 

 Shell umbilicate, depressed, conoid, very finely arcuately striated, densely 

 covered by excessively minute spiral lines, giving the shell a silky lustre, a 

 little more shining below, amber coloured. Spire depressed, suture margined, 

 apex obtuse. Whorls 4 — ^h, a little convex, increasing slowly and regularly 

 at first, the last rather suddenly, and dilated at the mouth, not descending in 

 front, rounded at the periphery, convex below, swelling towards the mouth. 

 Aperture a little oblique, roundly lunate, margins approaching ; peristome 

 thin, straight, acute, columellar margin arcuate, dilated, slightly overhanging 

 the moderate umbilicus. 



T)iam maj. 9 millim., min. 7.5 ; alt. 5.5. 



Hah. — Long Reef, South Australia. 



With Badisfes hednallL Type in ni)' collection. 



Allied to Thalassia inllaris, Pfr., but more elevated, more rounded at the 

 periphery and more swollen at the base. 



Troehonanina sykesi, n sp. 



PI. iv, figs. 7a — 7b. 



Shell imperforate, finely striated, smooth, shining, pale, more or less radiately 

 streaked trans\ersely and covered abo\e with crowded spiral opaque creamy 

 lines which become sparser and darker below. Spire convex, suture linear 

 becoming crenulate at the last whorl, apex obtuse. Whorls 5, flattened, in- 

 creasing slowly and regularly, last whorl not descending in front, bluntly 

 keeled at the periphery, convex below, excavated at the umbilical region. 

 Aperture a little oblique, securifoim ; margins distant ; peristome thin straight 

 acute, columellar almost vertical, thickened, slightly dilated, white. 



Diani. maj. 8.5 millim., minor 8 ; alt. 6. 



Hah. — Marquesas. (Garrett 1879). 



Type in Mr. Sykes' collection. 



Allied to 2\ suJ>rutila, Pfr., and rhauusr'di, Pfr., l)ut UKjre ele\ated in 

 the spire than either The keeled periphery and the vertical columellar 

 margin further separate it from T. rha»us'<oi. 



Charopa lifuana, n. sp. 



PI. iv, fiiJS. 6a — 6c. 

 Shell umbilicated, discoid, finely ribbed, fuscous, opaque, solid, spire flattened, 

 suture rather deep. Whorls 5, increasing slowly, convex ahove, rounded at 

 the periphery, tumid below, obtusely angulated round the wide umbilicus. 

 Aperture scarcely oblique, subrotundate, margins approaching : peristome 

 straight, acute, sinuous ; upper margin arcuate, columellar receding over the 

 umbilicus, not dilated. 



Diam. 3.5 millim. ; alt. 1.5. 



Hah. — Lifu, Loyalty group. 



Type in M. Sykes' collection. 



Allied to C. vefula, Gass., but it possesses a wider umbilicus. 



