23 



Cerithium laciniosum. Shell conical, rather thick, yellowish 

 white, with a few, irregular, brown spots ; whorls six, flattened, 

 depressed in the middle, longitudinally plicate, transversely stri- 

 ate ; aperture ovate ; canal short, slightly deflected. Length, 

 4- inch, diameter, -^ inch. Hah. Oahu. 



Pleurotoma CRASSILABRU3I. Shell short, thick, solid, white, 

 covered with coarse, tortuous ribs, and fine, crowded, transverse, 

 striae ; whorls eight, angular, tuberculated in the middle ; spire 

 tapers rapidly above the penultimate whorl, and ends in a sharp 

 tip ; aperture narrow, half the length of the shell, striated inter- 

 nally ; lip thick ; fissure distinct ; canal short. Length, y^ inch, 

 diameter, -^ inch. Hab. Oahu. 



Pleurotoma rugosa. Shell thick, solid, covered with coarse 

 ribs, and rather coarse transverse striae ; whorls seven, convex ; 

 suture accompanied with a purple line on a straw-colored ground ; 

 aperture narrow, striated internally ; lip thick ; fissure well 

 marked ; canal very short. Length, ^\ inch, diameter, -f^ inch. 

 Hah. Oahu. 



Pleurotoma acuminata. Shell small, wax colored, with tor» 

 tuous ribs ; whorls seven, slightly convex ; spire rapidly tapering, 

 ending in a sharp point ; aperture one third the length of the 

 shell, smooth internally ; lip thin ; fissure deep ; canal veiy short. 

 Length, ^^^ inch, diameter, y\ inch. Hah. Oahu. 



Pleurotoma coronata. Shell thick, solid, white, shining, with 

 strong ribs, ending at the suture in projecting points, transverse 

 striaj microscopic ; whorls four, flattened, angular ; aperture half 

 the length of the shell, unarmed ; lip thickened ; fissure well 

 marked ; canal short. Length, -^-^ inch, diameter, ^\ inch. Hab. 

 Oahu. 



Pleurotoma micans. Shell small, white, pellucid, smooth 

 and glistening, with obscure brown spots ; whorls six, convex ; 

 aperture half the length of the shell ; lip acute ; fissure super- 

 ficial ; canal short. Length, y\ inch, diameter, -^\ inch. Hab. 

 Oahu. 



Pleurotoma pumila. Shell small, purple, surface granulated ; 

 whorls four, convex ; aperture narrow, one third the length of 

 the shell ; right lip thickened, with four or five small teeth pro- 

 jecting inwardly ; fissure well marked ; canal very short. Length, 

 -^jj inch, diameter, ^^.j inch. Hah. Oahu. 



Pleurotoma sinuosa. Shell short, thick, tumid, yellowish. 



