252 GASTROPODA. [Pectinibranchia. 



2. Seila chathamensis, Suter, 1908. Plate H, fig. 26. 



Seila chathamensis, Suter, P. Mai. S., viii. 37, pi. 3, f. 45. 



Shell small, elevated conic, solid. Sculpture : First whorl smootli, 

 the succeeding 2 with 2 cinguli, the upper of which is inconspicuous, 

 but the lower one is thick and prominent ; the following 5 whorls 

 have 3 rounded cinguli, then there are 4 on the next volutions, and 

 6 on the last whorl, the lowest being upon the base ; the uppermost 

 cingula on the last whorl is usually grooved or divided into 2 narrow 

 cinguli, increasing their number to 7. The interspaces are densely 

 and finely longitudinally striated by growth -lines. Colour fulvous. 

 Spire high conical, much higher than the aperture ; outlines slightly 

 concave below the first 2 whorls, nearly straight further down. Proto- 

 conch small, depressed, of 1 smooth whorl only. Whorls about 13, 

 regularly increasing, the second and third convex, the others flattish ; 

 base flat, concave round the canal. Suture not much impressed. 

 Aperture vertical, subquadrangular, produced below into a very short 

 and open canal, which is slightly turned to the left. Outer lip denti- 

 culated outside by spiral sculpture, smooth inside. Basal lip nearly 

 straight. Columella arcuate, bent over at a blunt angle toward the 

 canal. Operculum unknown. 



Diameter, 3-2 mm. ; height, 10 mm. 



Animal unknown. 



Type in my collection. 



Hab. Foveaux Strait, in 15 fathoms (type) ; Chatham Islands ; 

 Hauraki Gulf (H. S.). 



3. Seila cochleata, Suter, 1908. Plate U, fig. 27. 



Seila cochleata, Suter, T.N.Z.I., xl, 1907 (1908), 361, pi. 28, f. 3. 



Shell small, conic, solid, dark brown. Sculpture consisting of flat 

 cinguli, 3 on the 2 whorls succeeding the embryonic shell, 4 on the 

 following 4 whorls, and 5 on the body-whorl, to which are added 

 2 narrower 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 strife ; the in- 

 tercalation 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. Protoconeh 

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

 increasing, 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 



