114 BEV. R. BOOG WATSON ON THE 



straight outlines, distinct suture, rounded base, tubercled, thin, 

 translucent white. Sculpture. Longitudinals — the whorls are 

 crossed by oblique, curved, and tubercled ribs, of which tbere are 

 on the last whorl 17, on the preceding 14, and they diminish 

 rapidly in number. They are quite obsolete near the mouth, and 

 die out on the base ; they are parted by open longitudinal fur- 

 rows fully wider than themselves. The furrows and ribs run 

 down the spire from whorl to whorl without a twist, but with 

 a strong dextral obliquity. There are a very great many fine 

 irregular and unequal lines of growth. Spirals — each whorl is 

 carinated by two strongish rounded spiral threads, which rise 

 into largish tubercles on the longitudinal ribs ; the upper is 

 rather the stronger and more prominent ; near the mouth they 

 both become feebler : the tubercles on the upper thread are 

 smaller, while on the lower they disappear. These spirals are 

 parted by a flat shallow furrow about twice as wide as themselves. 

 Below the under spiral the whorls contract into the suture, 

 above which is a very narrow fiat thread, which on the base 

 forms the strongish marginal border. Above the upper spiral the 

 whorls also contract, and immediately below the suture there is 

 a very small and feebly tubercled spiral. On the base, within the 

 marginal thread, is another. The centre of the base is plain and 

 a little impressed; round the base of the pillar are two fine 

 threads, while a third, very minute, twists up the pillar. The 

 whole surface is fretted with minute microscopic spiral scratches. 

 Colour translucent white. Spire is high, and has straight out- 

 lines. Apex, which is blunt and perfectly rounded and glossy, 

 has two whorls. Whorls 12, of regular increase, convex, being 

 constricted above and below. Suture linear, but well marked. 

 Mouth oval, scarcely pointed above, and with an open shallow 

 canal in front, resembling that in O. reticulatum. Outer lip very 

 thin, very slightly ascending where it joins the body, forming an 

 equable, nearly semicircular curve to the edge of the canal. Pillar 

 very short and little projecting, with a distinct twist ; at the point 

 small, rounded, and narrow-edged. Inner lip forming a con- 

 tinuous curve across the body and up the pillar ; on the body it 

 is a thin glaze, but its edge on the pillar is thicker and more de- 

 fined. Height 0-31. B. 0-09. Penultimate whorl, height 0'04. 

 Mouth, length 0*066, breadth 0'05. 



15. Ceeithitjm (Bittittm) pttpieorme, n. sp. 



St. 186. Sept. 8, 1874. Lat. 10° 30' S., long. 142° 18' E. 

 "Wednesday Island, Cape York. Coral-sand. 8 fms. 



