Daphnella.} GASTROPODA. 51 



o 



downward sweep, then retreating again. Columella straight, slightly 

 oblique, twisted below, the sharp edge forming a sharp point below. 

 Inner Up inconspicuous. (Watson.) 



Diameter, 13-5 mm. ; height. 22 mm. 



Animal unknown. 



Type in the British Museum. 



Hab.Ofi Cape Turnagain, in 1,100 fathoms (" Challenger v ). 



12. Daphnella xanthias, Watson, 1886. Plate 22, fig. 11). 



Pleurotoma (Thesbia) xanthias, Wats., Chall. Rep., xv, 334. pi. 26. f. 10. 

 Daphnella xanthias, Suter, T.N.Z.I., xxxi, 77 ; Index, 71. 



Shell oval, biconical, feebly spiralled, white. Sculpture consisting 

 of numerous flat threads, parted by slight irregular lines, below the 

 blunt carination in the middle of the whorls, the upper part being 

 smooth ; growth-lines fine, slightly puckered below the suture. Colour 

 white, glossy. Spire high, conical, its height somewhat less than that 

 of the aperture. Protoconch has probably 3 to 3| whorls, but the apex 

 is lost and only 2 remain, microscopically scored by minute straight 

 lines, sloping obliquely to the left below. Whorls 4J, below the apical 

 nucleus ; feebly angulated in the middle, the last large, gradually 

 narrowed at the base. Aperture narrowly oblong, pointed above, 

 without a canal below. Outer lip thin, flatly arched, with a deep 

 broad sinus, close up to the suture ; below the sinus the edge of the 

 lip swings forward in a great wing-like curve. Columella long, sub- 

 vertical, slightly truncate below. Inner lip inconspicuous. (Watson.) 



Diameter, 10-2 mm. ; height. 19-5 mm. 



Animal unknown. 



Type in the British Museum. 



Hob. Off Cape Turnagain. in 1,100 fathoms (" Challenger "). 



Fam. TEREBRID^E, Adams. 



Animal having the foot rounded in front, elongated behind ; head 

 rather large, with short small tentacles furnished with eyes at their 

 tips ; between the tentacles extends anteriorly a rather long cylindrical 

 trunk. Teeth of radula subulate, arcuate, in two lateral rows ; formula 

 1 + 0+1. 



Shell long, solid, narrow, many-whorled, whorls flattened, suture 

 superficial ; aperture small, notched below ; columella without plaits. 

 Operculum horny, annular, with apical nucleus. 



Distribution. Tropical and subtropical. About 200 species. 



Fossil in the Tertiary, commencing with the Eocene. 



Genus 1. TEREBRA, Lamarck, 1799. 



Terebra, Lamarck, Mem. Soc. Hist, Nat. Paris, 1799, 71. Type : Buc- 

 cinum subulatum, L. Terebrurn, Montfort, 1810. 



Shell subulate, narrow : protoconch smooth, conoidal. with a 

 deviated nucleus ; spire very high, pointed, many-whorled. generally 



17 Moll. N.Z. 



