S I G ARETU S. 



Plate V. 



Species 22. (I'ig. a, h, JIiis. Cumiiin'.) 



.SiGAKETUS EXIMIUS. Si(j. iedd vix iimiilicatii, ovai/i, 

 tenui, deji/vssd, opoco-alhd, spird piirvd, anfractihiis 

 dn/se sjiiraliler fiinicnlatis, biterstitiis minute caiicel- 

 latls. 



The delicate Sigaeetus. Shell scarcely umbilicated, 

 ovate, tliiu, depressed, opaque white, spire small, 

 whorls densely spirally corded, interstices minntely 

 cancellated. 



Hnb. Malacca (in sandy mud at the depth of seven fa- 

 thoms) ; Cumins:. 



Delicately sculptured throughout with tiu'^ cord-likr 

 ridges, the interstices between which are minutely can- 

 rellated. 



Species 23. (Fig. c, f>, Mus. Cuming.) 



SiGARETUS PELLUCIDUS. Siff. testd profioide umbilicald, 

 semiylobosd, pellucido-alhd, sjiird suhohliisd, aiifracli- 

 htis siipmii decUvihm, delude tumidmsculis, spiraliter 

 Ihieari-iiicisis, suhis juxta sulnras i-alidioribus. 



The tkansparbnt Sigaketus. Shell deeply umbili- 

 cated, semiglobose, transparent-white, spire rather 

 obtuse, whorls sloping round the upper part, then 

 rather swollen, spirally linearly incised, grooves 

 stronger next the sutures. 



llab. ^Malacca. 



A very transparent shell, but yet of I'atlier solid structure. 



Species 24. (Fig. a, b, Mus. Cuming.) 



SiGARETi's PiCTUS. Sig. testd profundi umbilicatd, glu- 

 boso-oratd, nitente-albd, strigis fiilvcscetitibtis hnti- 

 gitiosd, spird parvd, anfradibus declivi-vnitricosin, 

 lavibus. 



The paikted Sigaretus. Shell deeply umbilicated, 

 globosely ovate, shining-white, freckled with fidvous 

 streaks, spire small, whorls slopingly ventricose, 

 smooth. 



Hub. Adelaide, South Australia. 



Of quite a distinct type from any of the preceding 

 species, smooth shiniu'.;' white, faintly painted with fulvo\is 

 streaks. 



Species 2.5. (Fig. a, b, Mus. Cuniiuo-.) 



Sigaretus argenteus. Sig. lestd vix umbilicald, de- 

 presse ocatd, candidd, spird parvd, pariim exsertd, an- 

 frnctibus vndique spiralilfr liratis d slriatis. 



The silver Sigaretus. Shell scarcely umbilicated, de- 

 pressly ovate, white, spire small, but little exserted, 

 whorls spirally ridged and striated throughout. 



Hab. Australia ; Jukes. 



Of the same characteristic form as the little S. eximins 

 just descriljed, and sculptured in au almost similar 

 manner. 



Species 26. (Fig. a, b, Mus. Cuming.) 



Sigaretus FIBUL.\.. Sig. testd mnbilicatd, semiglobosd, 

 solidivscnld, albd, sjnrd parvd, obtiisd, anfractibus 

 snperne declivibns, deinde gibbosiusculix, trevibiis, vel 

 oblique 7ninntissimi striiitis. 



The button Sigaretus. Shell umbilicated, semiglo- 

 bose, rather solid, white, spire small, obtuse, whorls 

 sloping round the upper part, then rather gibbous, 

 smooth, or obliquely very minutely striated. 



Hab. ? 



This little species, it will be obser\ed, has no spiral 

 sculpture. It is of solid growth, rather conspicuously 

 umbilicated. 



September, IS 64. 



