TBACHELIPODA. 83 



short. Two and a half inches long. Inhabits the sea at ^lo- 

 lucca. 



Genus 51.— STOMATIA.— ZamarcA. 



Generic Character. — SheW ear-shaped, imperforate, spire pro- 

 minent ; aperture entire, oblong, and large ; right lip elevated as 

 much as the pillar ; back with a transverse subcarinated tuber- 

 culated rib. 



Stomatia phymotis. — The Tumoured Stomatia. Plate XII. 

 fig. 29. Ovate oblong, back convex, striated, nodulous, and 

 white ; spire small, contorted ; lip thin and acute. Three and a 

 fourth inches long. Inhabits the Indian ocean. 



Genus 52. — STOMA TELL A — Lamarck. 



Generic Character. — Shell orbicular or oblong, ear- shaped, 

 imperforate ; aperture entire, large, elongated ; outer lip effuse, 

 dilated, and open. 



Tnis shell is distiugnished from the Stomatia, by its never having tlie 

 transverse rib of the species of that genu?. 



Stomatella imhricata, — The Imbricated Stomatella. Plate 

 XII. fig. 30. Suborbicular, convex, somewhat depressed, rough, 

 having thick-set transverse ribs, covered with imbricated scales ; 

 grayish-brown. One and a half inch long. Inhabits the In- 

 dian ocean. 



Genus 53.— SIGARETUS.— Zawaroi^. 



Generic Character. — Shell subauriform, suborbicular ; outer 

 Up short and spirally intorted ; aperture entire, very expanding, 

 ovate oblong ; the margins disunited. 



The Sigaretus somewhat approximates the geniis Natica, and much re- 

 sombles a depressed shell of that genus, from which, however, the extraor- 

 dinary width of the aperture, and its spiral short columella render it quite 

 distinct. 



Sigaretus concavus.— The Coxcave Sigaretus. Plate XIL 

 fig. 25. Ovate, back convex, covered with transverse undulated 

 striae ; reddish-yellow, spire white, somewhat prominent ; aper- 

 ture expanded, concave ; umbilicus deepish. Inhabits the In- 

 dian ocean. 



