514 GASTROPODA. [Pectinibranchiat 



with a sutural band which does not correspond with a labial sinus ; 

 aperture short, distinctly channelled above, and deeply notched at 

 the base ; outer lip thin ; columella smooth, inflexed below, ending 

 in a point, and an elevated border alongside the canal ; inner lip thin, 

 not callous, from underneath it arises a narrow rib which encircles 

 the beak, limiting the growth-lines of the basal emargination, and 

 terminating at the angle of the outer lip. 



The species are inhabitants of shallow water principally ; most of 

 them have been obtained in depths of from 10 to 25 fathoms, but one 

 species was dredged in about 100 fathoms. 



Vernacular Name. Auger-shells. 



KEY TO SPECIES. 



a. Spire-whorls with inequidistant, flatly rounded, flexuous axial 



plications ; no peripheral band on the body- whorl . . flexicostata. 



aa. Spire-whorls with equidistant, sharply rounded, nearly straight 



riblets ; body-whorl with peripheral band . . . . tristis. 



'l. Terebra flexicostata, Suter, 1909. Plate 22, fig. 20. 

 Terebra flexicostata, Sut., P. Mai. S., viii, 1909, 255, pi. 11, f. 8. 



Shell subulate, axially flexuously plicate, shining, brown, with a 

 pale band below the suture. Sculpture consisting of irregularly spaced 

 flexuous flatly rounded axial plications, obsolete on the body-whorl, 

 the interstices with fine growth-lines ; indistinct fine microscopic 

 spiral striae are present. Colour fulvous or flamed with fulvous and 

 white, a light-brown or white band below the suture, no peripheral 

 band on the body-whorl. Spire high, angle about 20. Protoconch 

 smooth, conical. Whorls about 10, first slowly then more rapidly 

 increasing, very flatly convex ; base rounded, somewhat contracted 

 above the basal rib. Suture impressed. Aperture subvertical, nar- 

 rowly oval, with a short and rather narrow canal, narrowly notched 

 below. Outer lip broadly convex, sharp. Columella subvertical, 

 lightly convex, narrowly drawn out to a point at the base of the canal ; 

 somewhat excavated on joining the flat parietal wall above. Inner 

 lip thin and narrow. Operculum unknown. 



Diameter, 5 mm. ; height, 18-5 mm. 



Animal unknown. 



Type in my collection. 



Hob. Cape Maria van Diemen (Captain Bollons) ; Port Waikato 

 (W. H. Webster). 



Remarks. The T. venosa reported as having been found at Port 

 Waikato by Mr. W. H. Webster is no doubt T. flexicostata. The 

 species is allied to the Australian T. Brazieri, Angas, but the whorls 

 are flatter, the riblets straighter, and the spire is more slowly tapering. 



