Cerithiopsis.] GASTROPODA. 247 



4. Cerithiopsis crenistria, Suter, 1907. Plate 14, fig. 19. 



Cerithiopsis crenistria, Suter, T.N.Z.I., xxx : x. 1906 (1907), 250, pi. 9, f. 4. 



Shell small, turriculate, imperforate, thin and semitransparent, 

 ornamented with numerous nodules ; aperture small, terminating 

 in a short and widely open canal. Sculpture formed by 2 low spiral 

 ribs, which are crossed by equidistant axial costse, 12 on the last whorl, 

 which do not reach the suture ; the crossing-points of the two kinds of 

 ribs are raised to very distinct nodules, first round, oval on the later 

 whorls. Colour very light brown, shining. Spire high, turriculate. 

 Protoconch of a lighter colour, 1| whorls, top flattened, radially striate, 

 and on the periphery with a row of elongated small nodules. Whorls 9, 

 the second has a slightly greater diameter than the third ; sides bi- 

 angulate, nearly straight ; base flat, depressed round the canal. Suture 

 very distinctly impressed, margined below by a small thread. Aper- 

 ture, subquadrate. produced into an open and short canal, which is 

 a little turned to the left and backward. Outer lip sharp, but little 

 convex. Basal lip concave. Columella slightly concave, the inner 

 lip spreading as a very thin, narrow, and whitish glaze over it. Oper- 

 culum unknown. 



Diameter, 3 mm. ; height, 8 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Hauraki Gulf, near Channel Island, in 25 fathoms, one speci- 

 men (type) ; Snares, in 50 fathoms (Captain Bollons). 



Remarks. I do not think this specimen is adult. It is larger and 

 less subulate than C. sarissa, Murd. 



5. Cerithiopsis marginata, Suter, 1908. Plate 14, fig. 20. 



Cerithiopsis marginata, Suter, P. Mai. S., viii, 36, pi. 3, f. 44. 



Shell very small, subulate, solid. Sculpture consisting of 2 broadly 

 rounded cinguli, the last 2 whorls with a narrow thread margining 

 the suture, and 2 additional narrow and smooth keels on the body- 

 whorl bounding the smooth base ; axial sculpture formed by straight, 

 equidistant, and rather broad riblets, about 20 on the last whorl ; cross- 

 ing-points produced into rounded gemmules. Colour white. Spire 

 elevated conic, much higher than the aperture ; outlines faintly convex. 

 Protoconch papillate, the nucleus globular, of 1| smooth and polished 

 whorls. Whorls about 8, regularly increasing, the upper ones some- 

 what convex, the others flattish ; base slightly concave. Suture 

 impressed, margined on the last whorls. Aperture subquadrangular, 

 produced into a short and open canal, not notched at its base. Outer 

 lip nodulous on the outside. Basal lip sinuate. Columella sub- 

 vertical, straight, truncated below by the oblique upper margin of 

 the canal. Operculum unknown. 



