Bathytoma.] GASTROPODA. 491 



narrow below, drawn out to a fine point toward the canal, spreading 

 more broadly over the arcuate parietal wall. Operculum unknown. 



Diameter, 3-75 mm. ; height, 9 mm. Angle of spire, 30. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



flab. Throughout New Zealand, in about 5 to 25 fathoms, but 

 far from common. The type is from 24 fathoms, Stewart Island. 

 Rangitoto Channel, dredged (T. F. Cheeseman) ; Cheltenham Beach 

 (H. S.) ; Snares, in 50 fathoms (Captain Bollons). 



Fossil in the Pliocene and Miocene. 



2. Bathytoma Cheesemani, Hutton, 1878. Plate 49, fig. 5. 



Drillia Cheesemani, Hutt., J. de Conch., xxvi, 1878, 16 ; M.N.Z.M., 

 44 ; T.N.Z.I., x, 294. Pleurotoma Cheesemani, Hutt., Plioc. M., 49, 

 pi. 6, f. 24. Surcula Cheesemani, Hutt. : Suter, T.N.Z.I., xxxi, 69 : 

 Index, 71. Pleurotoma zealandica, E. A. Smith, A.M.N.H. (4), xix, 

 1877, 492 ; M.N.Z.M., 43. Bathytoma zealandica, E. A. Smith : Suter, 

 J. Mai., xii, 73. 



Shell oval-fusiform, gradated, fairly strong, spirally lirate, light 

 brown, somewhat shining. Sculpture : The protoconch is smooth, the 

 succeeding whorls are very narrowly shouldered, the slope strongly 

 axially striated, keeled below by a narrow spiral rib, which is slightly 

 nodulous ; this is followed, separated by a narrow groove, by a broad 

 flat spiral band, ornamented by the crescent-shaped growth-lines of 

 the slit, and below this are 2 narrower flat spiral bands, separated by 

 linear grooves ; on the body-whorl below the periphery are about 

 11 unequal and ineqtddistant slightly raised and flat spiral lirae ; the 

 fascicle margined by a sharply raised ridge and with a few oblique 

 riblets. Growth-lines distinct, fine and crowded, flexuous, passing 

 over the cinguli, but more distinct in the very shallow grooves. 

 Colour : The apex dark brown, the spire-whorls yellowish-brown, the 

 base purplish-brown, the keel on the fasciole usually darker ; interior 

 of aperture and inner lip brown. Spire conoidal, gradate, with a 

 sharp apex, very little higher than the aperture with canal. Proto- 

 conch minute, conic, smooth, the nucleus somewhat tilted. Whorls 9, 

 lightly convex below the shoulder ; body-whorl large, somewhat in- 

 flated, contracted towards the base. Suture well marked. Aperture 

 large, oval, oblique, angled above, with a short broad and recurved 

 canal, its base notched. Outer lip convex, thin and sharp, with a 

 broad rounded and moderately deep sinus, situate at the broad spiral 

 band above the periphery. Columella lightly excavated, vertical, 

 with a distinct broadly rounded fold below, twisted, bent to the left, 

 and drawn out to a fine point. Inner lip, thin, spreading a short dis- 

 tance beyond the pillar, and broadly on the arcuate parietal wall. 

 Operculum small, the nucleus subapical. 



Diameter, 9 mm. ; height, 19-2 mm. (type). Diameter, 12 mm ; 

 height, 26 mm. (large specimen). 



Type in the Otago Museum, Dunedin. 



