40 SIGARETUS. 



although concave behind the arched part of the inner lip. A 

 colourless variety is erroneously figured in Reeve's mono- 

 graph as latifasciata of Adams and Reeve in the Samarang. 

 The spiral grooves are strong and regular. 



2. NERITOIDEDS, f. 1, 16, 17, LinncBus. — Testa oblique 

 ovata, concava, albida, dense spiraliter striata, striis minu- 

 tissime rugatis ; medio latissime pallide livido, intus castaneo 

 pallide fasciato ; spira brevissima, apice livide lutescenti, 

 ultimo anfractu post labium internum excavato ; apertura 

 subrotunda, labio externo superne flexus. — Linnseus has 

 described in his Systema as Helices two species of 

 sigaretus. Two species are in the Linngean collection, 

 which correspond with the descriptions correctly enough as 

 far as the few words go ; ' convexa ' for the present species, 

 and ' depresso-'planiuscula ' for the Helix haliotoideus, 

 together with their respective names, should be sufficient at 

 least to distinguish them from each other. The words 

 * testa livida ' in the 'Museum' description, although they 

 seem to have puzzled the author of ' Ipsa Linna'i Conchylia,' 

 are quite explained in reference to this species, by a pale 

 greyish band in the specimens, and in the var. f. 1 {latifa- 

 sciatus of Ad. and Rve. Voy. Lam. not Rev. Con. Icon.) 

 this band becomes more palpable. 



3. Javanicus, f. 3, 4, Gray. — Quam Sig. neritoideus 

 magis expansa, liris magis planatis, distant! bus et acutis, 

 apice livido apertura rotunda. — Having a near affinity witli 

 S. neritoideus, but with the ridges more flattened and dis- 

 tant, although acute at the edges. The body part of the last 

 whorl is not so deep and ventricose. In all respects we may 

 regard this shell as intermediate between the preceding and 

 succeeding species. In our fig. 4 the sculpture is not suffi- 

 ciently close and crisp. 



4. Leachii, f. 23, 24, 25, De Blainville. — Testa alba, 

 solida planiuscula, depressa ovato-suborbicularis ultimo 

 anfractu infra angnlato planulato lato vix umbilicato, extus 

 spiraliter planilirata, inter liras profunde sulcata ; spira 

 immersa ; apertin-a ovata baud profunda. — Our shell, the 

 Cryptostoma Leachii of Blainville, is flatter than either of 

 the preceding species, and is distinguished by rather wide 

 and deeply cut sculpture. It may possibly be the same as 

 Adanson's Sigaretus, which is certainly not the full-bodied 



