SuTER. — On New Zealand Pleurotomidae. 75 



Genus Daphnella, Hinds (1844). 



Shell thin, fragile, oval-fusiform; whorls convex; body- 

 whorl elongated, surface finely cancellated ; aperture oval ; lip 

 simple, not varicose, arcuated ; canal very short. 



Type : Pleurotoma lymneiformis, Kiener. 



Key to Species. 



1. Spire shorter than the body-whorl. 



a. Surface finely but distinctly and regularly can- 



cellated or only nodulous spiral striae on the 



body-whorl . . . . . . .. D. lymneiformis. 



b. Surface microscopically, rather irregularly can- 



cellated. 

 aa. Whorls rounded . . . . . . D. membranacea. 



bb. Whorls shouldered . . . . . . D. xanthias. 



2. Spire longer than the body-whorl. 



a. Surface with longitudinal fine ribs .. .. D. protensa. 



b. Surface only spirally finely striated . . . . D. substriata, 



3. Spire about the same length as body-whorl, spirally 



ribbed, minute .. .. .. .. D. lacunosa. 



Daphnella lymneiformis, Kiener. 



Kiener, Icon. Pleurotoma, p. 62, pi. xxii., fig. 3; Tryon, 

 Man. Conch. (1), vol. vi., p. 300, pi. xxv., fig. 60, 

 pi. xxvi., fig. 93 (1884). D. cancellata, Hutton, Journ. 

 de Conch, 1878, p. 18; Man. N.Z. Moll., p. 45 (1880). 

 D. decorata, C. B. Adams, Couch. Contr., p. 62. 

 D. patula, Eeeve, Proc. Zool. Soc, 1845, p. 113. (The 

 two latter synonyms are given on the authority of 

 Tryon.) 



Shell fusiform, thin, spire acute ; whorls with narrow, 

 close, revolving ridges, the earlier ones with longitudinal ribs ; 

 white, irregularly maculated with chestnut, often forming 

 longitudinal zigzag markings. Aperture oblong, slightly chan- 

 nelled in front, and with a slight posterior sinus. Animal un- 

 known. 



Length, 12-7 mm. ; breadth, 5 mm. 



Type in the Musee de Paris (?). 



Hab. Auckland Harbour. Cape Maria van Diemen. 

 Found also in the Pliocene of New Zealand. 



Daphnella lacunosa, Hutton. 



Hutton, Trans. N.Z. Inst., vol. xvii., p. 317 (1885); 



Pliocene Moll, of N.Z., Macleay Mem. Vol., p. 52, 



pi. vii., fig. 34 (1893). 

 Shell minute, fusiform. Whorls 5, the first two smooth, 

 the others with strong spiral ribs at equal distances. Spire- 

 whorls with 3, body-whorl with 10 or 12 of these ribs ; 

 the grooves rather broader than the ribs, and smooth. Aper- 

 ture ovate, about half the length of the shell ; the sinus 

 obsolete ; canal short, outer hp thin. 



