87 



varicibus distantibus, larainatis, latis, extantibus, postice in 

 angulum acutum productis ; apertura ovali, labio interne sub- 

 incrassato : colore albo. 



The varices of this species are broad, projecting, and flat, 

 with an angle at some distance from the suture ; the outline 

 of the varix above the angle is curved inwards, so that the 

 angle forms an elevated point. 



A common West Indian species. 



lo. S. MiTR^FORMis. (pi. xxxii. f. 30.)Soiv. Jun. Zool. 

 Proc. 1844. 



T. Sc. rauricatee similima, sed magis tenui; varicibus 

 augustioribus, angulis magis elevatis; anfractibus magis 

 distinctis: colore albo. 



The varices of this shell are less expanded, and the tooth- 

 like angle more elevated than in Sc. muricata; the shell is 

 also lighter and more elegantly formed. 



From Guacomayo, in Central America. The only specimen 

 we have seen is in Mr. Cuming's Collection. 



17. Sc. TENuicosTATA (pi. xxxiv. f. 76.) Sow. Juiir. 

 Zool. Proc. 1844. 



T. Sc. muricatse similima, sed magis ventricosa, apertura 

 majori; colore albo. 



This species is so much more ventricose than Sc. rimricata, 

 as to render the separation necessary. The aperture is much 

 larger. A small specimen was brought by Mr. Cuming from 

 the Isle of Luzon, but the most characteristic specimens are 

 unaccompanied by any information as to locality. 



18. Sc. TENUIS, (pi. xxxii. f. 6, 70 Sow. Jun. Zool. 

 Proc. 1844. 



T. tenui, pyramidali, acuminata, Inevi; anfractibus vix 

 contiguis; varicibus numerosis, larainatis, extantibus, regula- 

 ribus, postice rectangulatis, ad suturam inter se junctis; 

 colore albo. 



A very common West Indian' shell, very thin and fragile 

 with numerous sharp, laminar, angulated ribs. 



19. Sc. DENTicuLATA (pi. xxxii. f. 25. 26.) 



T. pyramidali, acuminata, tenui, spiraliter minute striata ; 

 anfractibus rotundatis, paululum separatis; varicibus numersis 

 sub-recurvis, prope suturam in dentem acutum productis; 

 apertura sub-rotundata, labio interno paululum incrassato : 

 colore albo. 



Similar to the last, but striated and having a tooth-shaped 



