42 SIQARETUS. 



excavata, spiraliter tenuiter striata ; spira parva parum 

 exserta. — A plain rather solid, obliquely oval shell without 

 any strong characteristics. 



1 1 . EXiMius, f. 54, Reeve. — Testa quam S. argenteus 

 tenuior gracilior, apertura antice magis oblique producta. — 

 Nearly similar in form to S. argenteus, but more obliquely 

 produced and thin in substance. 



12. MARTiNiANUS, f. 27, 28, Reeve. — Testa oblique ovata 

 depresso-convexa, subtus arcuata, solidiuscula ; spiraliter 

 Bublirata, concentrice rugoso-striata, fusco-rufescens, apertura 

 subovata, expansa, labio externo superne flexuoso, ad spiram 

 elevato prope suturam subcontracto ; spira parva, subimmersa. 

 — Rather convex for one of the auriform species, and arched 

 on the under side, distinguished by its banded chestnut 

 brown colour, which is strong on the upper and much modi- 

 fied on the under surface. 



13. UNiFASCiATFS, f. 52, Rccluz. — Tcsta castaneo late 

 fasciata, quam S. martinianus magis complanata. — I have 

 copied one of several figures given by Recluz under this 

 name, in some uncertainty as to whether it might be a variety 

 of Martinianus. I have, however, a similar broad-banded 

 shell which is much nearer to S. planulatus than to Martin- 

 ianus in form, being flatter, smoother than the latter, and not 

 at all arched. 



14. PLANULATUS, f. 29, 30, Recluz. — Testa alba ovata de- 

 pressa, subtus arcuata, superne planulata, epidermide strami- 

 nea induta, laevigata, ultimo anfractu subtus lato planulato ; 

 apertura subquadrata, antice angulato, labio externo ad 

 spiram elevato, tum undulatim emarginato, supra medium 

 attenuatim producto. — This very flattened, smooth white 

 shell is distinguished by a strong sinus and almost linguiform 

 projection at the upper part of the outer lip. 



15. HALiOTOiDEUS, f. 5, 31, LinncGUS. — ^Testa ovata alba 

 planulata, tenuiter inciso-lirata, ultimo anfractu subtus 

 late planato ; apertura parviuscula, labio interne tenui, 

 arcuato, labio externo versus suturam vix emarginato, supra 

 medium parum producto ; spira immersa. — The small flat 

 white shell figured by Eeeve as S. incisus, the specimens 

 from which our figures are taken and the one from the 

 Linnsean cabinet figured in the ' Ipsa Linnaei Conchylia,' are 



