Mitromorpha.} GASTROPODA. 489 



the outer lip, a few very indistinct tubercles on the columella. Oper- 

 culum (?). 



Diameter, 7 mm. ; height, 16 mm. 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hob. Near Cuvier Island, in 37 fathoms (Captain Bollons). 



Remark. The generic position of this species is somewhat doubt- 

 ful, as we do not know whether an operculum is present or not. 

 Although the columellar plaits are very indistinct in the Recent speci- 

 men and absent in fossil forms, the globose nucleus, the crenate outer 

 lip, and the form of the shell induce me to class it for the present 

 under Mitromorpha. 



Fossil in the Miocene and Pliocene. 



3. Mitromorpha substriata, Suter, 1899. Plate 21, fig. 15. 



Daphnella sulstriata, Sut., T.N.Z.I., xxxi, 1898 (1899), 76, pi. 3, f. 6 ; Index, 

 71. Mitromorpha substriata, Sut. : Hedley, Rec. A.M., v, 1904, 97 ; 

 Murdoch, T.N.Z.I., xxxvii, 1905, 230. 



Shell small, mitriform, thin and fragile, white with a violet apex, 

 finely spirally striated. Sculpture consisting of delicate equal and 

 numerous fine spiral striae, extending over the whole shell except the 

 protoconch, the spiral below the suture a little stronger than the 

 others ; frequent inequidistant faint growth-periods form the only 

 axial sculpture. Colour whitish, the protoconch light violet. Spire 

 elevated, conic, about 1-| times the height of the aperture. Proto- 

 conch of If whorls, smooth, globose, the nucleus flatly convex, slightly 

 lateral. Whorls 6, regularly increasing, moderately convex ; base 

 slightly contracted. Suture not deep, margined by the spirals. Aper- 

 ture very little oblique, subrhomboidal, angled above, produced below 

 into a very short broad recurved canal, its base lightly emarginate. 

 Outer lip regularly convex, somewhat thickened inside, minutely 

 crenate. Columella vertical, slightly arcuate, excavated on meeting 

 the parietal wall, twisted below with a slightly raised edge. Inner 

 lip thin and narrow, smooth. Operculum (?). 



Diameter, 2-25 mm. ; height, 5-5 mm. 



Animal unknown. 



Type in my collection. 



H ab. - - Foveaux Strait, in 15 fathoms, type (A. Hamilton); 

 Whangaroa Harbour (C. Traill). 



Genus 2. BATHYTOMA, Harris and Burrows, 1891. 



Baihytoma, H. & B., Eoc. & Oligoc. Paris Basin, 1891, 113. Type : Murex 

 cataphractus, Brocchi. Dolichotoma, Bell., 1875 ; not of Hope, 1839. 



Shell oval, ventricose ; spire conoidal, turriculate ; protoconch 

 smooth, regularly conic, the nucleus slightly deviated ; whorls with a 

 crenate keel below the middle, excavated on the shoulder, the last 

 whorl large, oval, attenuated at the base ; aperture narrow, sub- 



