254 GASTROPODA. [Pectinibranchia. 



on the outside by the spiral keels, but little produced beyond the 

 opposite margin of the canal. Columella nearly straight, bent to the 

 left below to form the inner edge of the canal. Operculum unknown. 



Diameter, 3 mm. ; height, 12 mm. 



Animal unknown. 



Type in the Kgl. Naturalien Kabinet. Stuttgart. 



Hah. North and South Islands of New Zealand, in 10 to 20 

 fathoms ; Foveaux Strait ; Whangarei Heads (C. Cooper). 



Remarks. Button's name has priority by one month, but the 

 description is quite inadequate, and he himself adopted the name 

 bestowed on the species by von Martens. The type of C. cinctum, 

 Hutt., is in the Dominion Museum, Wellington. 



Fossil in the Pliocene. 



Fam. TRIFORID^J, Jousseaume. 



Shell generally sinistral, but very rarely dextral, elongate, subulate, 

 ornamented with spiral keels, which are either plain, tuberculate, or 

 gemmate ; aperture small, with a more or less recurved canal, gene- 

 rally tubular ; outer lip notched near the suture, sometimes forming 

 an isolated tube, which may be lateral or diametrically opposed to the 

 suture, on the dorsal side. 



This family includes the fossil genus Triforis, Deshayes, 1834 : 

 and the Recent genera Triphora, Blainville, 1828 ; Viriola, Jousseaume. 

 1884 : and Sychar, Hinds, 1844. 



Genus 1. TRIPHORA, Blainville, 1828. 



Triphora, Blainv., Diet. Sci. Nat., Iv, 344. Type : T. yetnmata, Blainv. 

 (= tristonifi, Blainv.). Mastonia, Hinds, 1844. Monophorus, Grille ; 

 not of Q. and G., 1824. Biforina, Bucq., Dollf., & Dautzb., 1884. 

 Mastoniceforis, Jousseaume, 1884. 



Animal with an elongated foot, truncated in front, where it forms 

 a duplicature, the upper margin less developed than the lower ; ten- 

 tacles long, cylindrical, united by a sinuated veil, eyes at their exterior 

 base ; snout very short ; operculigerous lobe simple. The radula 

 has the formula 4+1 + 1 + 1 + 4; the central tooth very short, 

 transverse, multicuspidate ; lateral tooth also transverse and multi- 

 cuspid ; marginals small, transverse, simple. P. Fischer remarks that 

 the dentition is paradoxical, there being 4 instead of 2 marginal teeth ; 

 but this multiplication of the marginals has also been observed in 

 other genera of the Tcenioglossa, especially in Struthiolaria. 



Shell small, always sinistial, conic, sometimes ventricose ; spire 

 high, subulate ; protoconch mostly smooth, elongate, with an obtuse 

 nucleus. Whorls about 15, with 2 or 3 spiral keels, usually closely 

 granulated, the axial ornamentation mostly not continuous from 

 whorl to whorl. Suture usually not deep. Aperture small, with a 



