GASTEBOPODA. 11 



22. F. triton, Lesson; Buccinum triton, Lesson, Rev. Zool., 1841, 

 37. Fusiform ; whorls spirally striated, those of the spire carinated, 

 and crossed by low transverse ribs ; keel sub-nodulose ; body whorl 

 convex, transverse ribs and sub-riodulose keel nearly obsolete ; aper- 

 ture oval, not angled behind ; outer lip slightly crenulated ; canal 

 short, bent to the left, slightly notched anteriorly. Brownish or 

 yellowish, sometimes obscurely longitudinally streaked with brownish 

 purple; interior white. Length, 2 35 ; breadth, 1 25 ; anle of spire, 

 55. 



Common. Chatham Islands. 



This species is larger than the next ; the outer lip is rounded, and 

 it never has two rows of nodules ou the body whorl ; but I believe 

 that one is only a variety of the other. 



23. F. nodOSHS, Martyn ; Buccinum raplianus, Quay, I.e., ii., p. 

 428 ; F. raplianus, Lctmark, I.e., ix., p. 451. Fusiform, ventricose ; 

 whorls spirally striated, those of the spire carinated, and crossed by low 

 transverse ribs ; keel nodulose ; body whorl bicarinated, each keel 

 with a row of nodules, sometimes obsolete on the anterior one ; aper- 

 ture oval, angled behind ; outer lip slightly crenulated ; canal short, 

 bent to the left, slightly notched anteriorly. From yellowish white, 

 longitudinally streaked with brownish purple, to brownish purple ; 

 interior w r hite. Length, 1 65 ; breadth, TO ; angle of spire, 55. 



Abundant ; Friendly Islands. 



Var. B. Body whorl with twelve nodular transverse ribs, which 

 do not reach to the suture ; small. 

 Cook Strait. 



FAMILY PLEUKOTOMID^;. 



Mouth exposed ; tentacles close together ; mantle enclosed ; shell 

 turreted, fusiform ; canal elongated, outer lip with a notch or groove. 



PLEUROTOMA. 



Outer lip with a fissure near the suture ; operculmn ovate-lanceo- 

 late, flat; front side straight; nucleus apical. 

 World- wide. 



24. P. (Drillia) novse zealandise, Reeve; P. rosra, 



,l.c., ii., p. 524 ; not of Sowerli/. Spire acute, whorls flattened, 

 'spirally striated, those of the spire transversely finely ribbed; ribs 

 interrupted in the middle, those on the anterior part of the whorls 

 oblique ; body whorl finely spirally and transversely striated ; sub- 

 nodulose near the suture ; aperture oblong, canal short ; body whorl 

 rather longer than the spire. Pale rosy white. Length, l'I2 ; breadth, 

 - 4 ; angle of spire, 25. 



25. P. trailll, sp. nov. Spire acute, with broad, shallow, spiral 

 grooves, and prominent transverse ribs on the central and anterior 

 portions of the whorls ; posterior margin, near t'ie suture, flat ; aper- 

 ture oval, canal short. Yellowish brown; bod v whorl shorter than 

 the spire. Length, I'l ; breadth, "4; angle of spire, 28. 



Stewart's Island, 24 fathoms. 



