24 



surface granulated ; whorls six, rather angular ; suture deep ; 

 aperture striated internally ; lip thickened ; fissure well marked ; 

 canal somewhat elongated, slightly tortuous, giving the shell a 

 slight gibbous appearance. Length, -^ inch, diameter, -fg- inch. 

 Hah. Oahu. 



Pleurotoma todilla. Shell small, surface granulated, dull 

 white, with microscopic, brown spots ; whorls six, convex ; apex 

 obtuse ; aperture narrow, less than half the length of the shell, 

 striated internally ; lip thickened ; fissure superficial ; canal short. 

 Length, -f-^ inch, diameter, -^ inch. Hab. Oahu. 



Pleurotoma circumsecta. Shell small, reddish brown, adorned 

 with rounded, slightly tortuous, longitudinal ribs ; whorls five, 

 tumid in the middle ; suture well impressed, with a contiguous 

 impressed line ; aperture rather wide, unarmed, one third the 

 length of the shell ; lip sharp ; fissure well marked. Length, 

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



Pleurotoma obnubila. Shell small, whitish, with elongated 

 brown spots, surface smooth, with a ie'w transverse striaB on the 

 extremity of the last whorl ; whorls six, flattened ; aperture one 

 third the length of the shell ; lip slightly thickened ; fissure su- 

 perficial ; canal short. Length ^^^^ inch, diameter, -^ inch. 

 Hah. Oahu. 



Triton lacunatum. Shell small, short, thick, yellowish ash 

 color, with coarse longitudinal and transverse raised lines, and 

 varices extending on both sides from the apex to the base ; whorls 

 seven, convex ; suture impressed ; aperture oval, stained with 

 purple, with purple lines extending into the depth of the shell, 

 and armed with a series of teeth just within the margin of the 

 right lip ; canal short, narrow, deflected. Length, f inch, long- 

 est diameter, -f , inch. Hah. Oahu. 



Cypr.^a semiplota. Shell ovate, ventricose, short, thick, 

 smooth, light brown, with numerous, obscure white spots ; base 

 tumid, white ; aperture yellowish, narrow. Length, | inch, 

 breadth, y\ inch. Hah. Oahu. 



Cypr^a insecta. Shell elongate-oval, subrostrate, white, stri- 

 ated transversely, striae extending into the aperture, with a longi- 

 tudinal, dorsal impression ; aperture white, narrow. Length, /^ 

 inch, breadth, y\ inch. Hah. Oahu. 



CypRiEA spiiiERULA. Shell very small, globular, white, with 

 an impressed dorsal line, and numerous transverse, impressed lines 



