Terebra.] GASTROPODA. 515 



2. Terebra tristis, Deshayes, 1859. Plate 46, fig. 2'.. 



Terebra tristis, Deshayes, P.Z.S., 1859, 306; Conch. Icon., xii. f. 102; Man. 

 Conch. (1), vii, 36, pi. 10, f. 100; Button, P.L.S. N.S.W., x, 118. 

 Terebra antarctica, E. A. Smith, A.M.N.H.. xi, 1873, 270. Cerit.Jiium 

 Kirki, Hutton, C.M.M., 1873, 27. Acus Kirki, Button, M.N.Z.M., 42. 



Shell rather small, subulate, axially plicate, grey or brown, with 

 a yellow band above the suture and below the periphery of the body- 

 whorl. Sculpture consisting of arcuate equidistant sharply rounded 

 riblets, flexuous -on the last whorl, the interstices broader than the 

 costse, of which there are about 16 on the body- whorl ; the interstices 

 have fine and dense growth-lines, which are crossed by more or less 

 distinct fine spiral striae. Colour chocolate, with a light-yellow spiral 

 band above the suture, continued on the body-whorl below the peri- 

 phery ; sometimes the colour is greyish-white or yellowish-brown. 

 Spire high, narrowly conic, sharply pointed, about 2| times the height 

 of the aperture. Protoconch small, smooth, nucleus rounded and 

 lightly deviated. Whorls 10, regularly increasing, somewhat convex ; 

 body-whorl convex, contracted above the spiral rib on the base. Suture 

 impressed, somewhat undulating. Aperture oblique, oval, lightly 

 channelled, with a very short broad canal below, its base broadly 

 emarginate. Outer lip regularly convex, sharp. Columella subvertical, 

 bent to the left below, continued as a narrow ridge to the base of the 

 canal ; excavated on joining the faintly convex parietal wall. Inner 

 lip narrow and very thin, usually distinctly bounded. Operculum 

 unknown. 



Diameter, 6 mm. ; height, 19 mm. (type). 



Animal unknown. 



Type in the British Museum. 



Hob. Throughout New Zealand. Bay of Islands (Anderson) ; 

 Whangarei Heads (C. Cooper) ; Hauraki Gulf (H. S.) ; offjWanganui, 

 in 20 fathoms ; Banks Peninsula (Iredale). 



Fossil in the Pliocene. 



Subsp. crassicostata, Suter, 1909. 



Terebra tristis crassicostata, Sut., P. Mai. S., viii, 1909, 255. 



Distinguished from the species by the following characters : the 

 shell is much smaller, the axial costs? are stouter, broadly rounded, 

 of the same width as the interstices ; fine spiral striae are also 

 present. Colour yellowish - white, a light - brown band below the 

 suture, and a white band below the periphery, arising from the 

 suture, base fulvous. 



Diameter, 3-5 mm. ; height, 10 mm. 



Type in my collection. 



Hab. Lyall Bay (Miss Mestayer). 



17* 



