272 GASTROPODA. \_fectinilifi m l>i. 



1. Turritella symmetrica, Button, 1873. Plate 39, fig. 20. 



Turritella (Eyli&ia) symetrica, Hutt., C.M.M., 30. T. rosea, Mantell, Quart. 

 Journ. Geol, Soc., vi, 1850, 331, pi. 28, f. l(i ; not of Quoy and Gaimard 

 T. (Ztirin) tricincta, Button, C. Tert. M., 13 ; not of Borson and autb. 

 Eglisia symmetrica, Hutt., J. de Conch., 1878, 29 ; M.N.Z.M., 8*. 

 T. kanieriensis, Harris, C. Tert. M.B.M., 241 ; Index, 76. 



Shell rather small, elongated, narrow, with prominent spiral orna- 

 mentation, thin and translucent. Sculpture : The first 1| whorls 

 smooth, the following ones with 3 subequal and equidistant spiral 

 keels, with a few fine spiral threads in the interspaces ; base with 

 unequal, fine, flat, spiral lines. Colour light-yellowish. Spire high, 

 narrowly conical ; outlines straight. Protoconch of 1| smooth, convex, 

 white and shining whorls. Whorls about 14, regularly increasing, 

 convex ; base flattened. Suture impressed. Aperture vertical, sub- 

 quadrangular. Outer lip thin, sharp, with a deep, broadly rounded, 

 median sinus, produced upon the keel of the body-whorl. Columella 

 vertical, rounded, narrowed below, and connecting with the slightly 

 effuse basal lip. Inner lip spreading as a thin polished glaze across 

 the body-whorl. Operculum unknown. 



Diameter, 5-5 mm. ; height, 17 mm. (type). Diameter, 6-5 mm. ; 

 height, 23-5 mm. (specimen of 14 whorls). Angle of spire, 18. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Stewart Island (type) ; Port Pegasus, Stewart Island, in 

 18 fathoms (Captain Bollons) ; Dunedin Harbour (A. Hamilton) ; 

 Lyttelton Harbour, in 2 to 4 fathoms (H. S.). 



Fossil. Miocene and Pliocene. 



Fam. MATHILDIID^J. Dall. 



In form these shells recall Bittium and Turritella : they are small, 

 turriculated, and slender ; the whorls spirally ridged and radially 

 striated ; the blunt sinistral nucleus not or only partly immersed. 

 Aperture entire, peristome sharp, columella smooth. Operculum 

 horny, multi spiral. 



Genus 1. MATHILDA, Semper, 1865. 



Mathilda, Semper, J. de Conch., xiii, 1865, 328. Type : M. quadricarinata, 

 Brocchi. 



Animal with very long thread-like, divergent tentacles, with rather 

 large eyes on prominences upon their exterior side, about a quarter 

 of their length from the base ; foot large, cut out in front, obtuse 

 behind ; operculigerous lobe having a row of cilia in constant move- 

 ment. Radula unknown. 



Shell turriculated, rather solid, apex heterostrophe, abruptly 

 turned from left to right ; whorls in the typical species cingulated 

 and reticulated by radiate striae. Aperture entire, subrotund, base 

 sometimes subeffuse ; lip acute ; columella smooth. Operculum 



