30 



21. S. Urckus. (pi. vii. f. 31. 35, 35, 37, 41, 42.) Gaici. p, 

 3.518. Nu. 29. var. S. incisus. Wood. Iiid. Test. Supp. 



T. S. Mutabili simillima, sed magis elongata, antice magis 

 attenuata; spira longiora. 



This species has not the square, truncated, flattened appearance of 

 8. mutabiiis. AH the varieties, although differing greatly from each 

 other, are easily distinguished from that species by the more 

 tapering form of the extremities. The typical variety has the 

 aperture of a dark, black colour. Some are uf a delicate pink ; 

 others are beautifully mottled on the back, and a variety (f. 36) 

 brought by Mr. Cuming from the Philippines, is of a much more 

 oval shape. Between the variety (f. 41) named S. incisus, by 

 Wood, and the typical variety, (f. 34) there appears to be a great 

 difference, but having a great number of specimens, we traced the 

 passage so gradually that it would be impossible to draw a line of 

 separation. E. Indies and Philippines. 



22. S. MAcuLATus. (pi. vii. f. 53.) Nuttall. 



T. ovali,laevi, antice truncata^ spira bievi,anfractibus rotundato- 

 nodulosis ; apertura angustata, laevi. 



A species having the general form of S. mutabiiis. It is of a 

 dingy white colour, with obscure purple spots. Sandwich Islands. 



23. S. RUGosus. (pi. vii. f. 58, 60.) Sow. Tank. Cat. App. 



" T. oblonga, longitudinaliter plicata, transverse striata, apice 

 acuminato, anfractibus superne nodulosis; ultimo anfractu altera 

 tuberculorum minimorum serie instructo; apertura oblonga, labio 

 externo intus striato, columellari valido, superne infraque trans- 

 versim striato; sutura crenulata." 



In shape like S. plicatus, but distinguished by its rugosity and 

 by a second row of tubercles on the last whorl. The colour is 

 white, mottled with brown. East Indies. 



24. S. PLICATUS. (pi. vii. f. 56.) Lam. Anim. s. vert. vii. p. 

 210. 



T. ovali, angulata, undatim longitudinaliter plicata spiraliter 

 striata, apertura striata. 



Resembling S. mutabiiis &c. in form, but longitudinally plicated, 

 •with the whorls angular, the ribs raised in tubercles at the angles. 

 Colour grey, banded with brown ; or brown, with white spotted 

 bands. E. Indies and Moluccas. 



25. S. ELEGANs. (pi. vii. f. 4.3, 48.) Nobis. 



T. sub-elongata, fusiformi ; s])ira sub-elongata, anfractibus 

 aiigulatis,ad angulum plicatis, in medio minute tuberculatis, antice 

 sulcatis; ultimi margine varicoso; apertura ovali, striata. 



Much shorter in the body whorl than any of the three preceding 

 species. It is of a pale brown, clouded in bands with darker brown; 

 the aperture is striated and of a dark brown colour. It approaches 

 S. rugosus in some characters, but is much more fusiform; the 

 spire much larger in proportion to the apertui'e. One variety is 

 nearly smooth. 



