Sutek. — Neiu Species of New Zealand Mollusca. 361 



white, without any strong callosity. Anterior valve with 4 

 slits, the 2 central ones broader ; intermediate valves with 1 slit 

 on each side, and posterior valve with 7 inequidistant slits ; all 

 teeth of the first 7 valves finely pectinated and sharp, but those 

 of the tail- valve are stout, deeply grooved, rather blunt- edged ; 

 all insertion plates are high. Sinus flat, finely denticulate ; 

 sutural laminae angularly produced, rather thin ; valve-callus 

 not much raised. 



Length, 22 mm.; breadth, 11mm.; dry specimen. Diver- 

 gence, 78°. 



Animal with the gills extending nearly the whole length of 

 the foot. 



Type in my collection. 



Hab. — Bay of Islands (J. C. Anderson). 



Remarks. — This shell is distinguished by its peculiar cunei- 

 form sculpture from all the species of the genus known to me ; 

 it adds another genus to the New Zealand fauna. 



2. Seila cochleata, n. sp. Plate XXVTIT, fig. 3. 



Shell small, conical, solid, dark-brown. Sculpture consisting 

 of flat cinguli, 3 on the two whorls suceeding the embryonic 

 shell, 4 on the following four whorls, and 5 on the body-whorl, 

 to which are added 2 narrow spirals on the base, the upper of 

 which arises from the suture ; all are of about the same strength, 

 the interstices of the same width as the cinguli, ornamented with 

 fine axial striae ; the intercalation of an additional spiral takes 

 place between the first and second rib, and it is at first very thin, 

 but gradually attains the same strength as the others. Colour 

 chestnut-brown. Spire elevated-conic, much higher than the 

 aperture ; outlines faintly convex. Protoconch broken off in 

 the only specimen I have. Whorls about 10, regularly in- 

 creasing, flat ; base somewhat excavated. Suture deep, canali- 

 culated by the spiral sculpture. Aperture triangularly oval, 

 angled above, produced below into a very short and open canal. 

 Outer lip rather thick, denticulated on the outside by the spirals, 

 angularly rounded on meeting the straight basal lip. Columella 

 vertical, short, arcuate, thick and rounded, subtruncate below ; 

 inner lip narrowly and thinly spread over the columella and 

 parietal wall. 



Diameter, 3-8 mm. ; height, about 10-5 mm. 



Type in my collection. 



Hab. — Bay of Islands (J. C. Anderson;. 



Remarks. — In sculpture this species equals the Pliocene 

 Bittium cinctum, Hutton (which, however, is a Seila), but the 

 fossil species has more whorls, is higher, and the outlines of 

 the spire are perfectly straight. 



