Ill 



CoLUMBELLA oxLEYi. n.s. Shell siiiall, fusiformly turretted, 

 smooth, shiniug ; whorls 8, soiuowhat rouuded, overlapping 

 slightly at the suture, apex with a distinct uatica like pullus 

 extending for '2^ whorls, smooth, pyriform, much narrower 

 posteriorly, and' produced, with a narrow sloping channel an- 

 teriorly, outer lip thin ; inner lip slightly inflected over the 

 columella, behind which are numerous sloping fine regular 

 lira.\ Body wdiorl slightly angulated at the suture. Lorig. 

 9, Lat. 3 m'il. Named after the early explorer of N. S. Wales. 



This singular fossil varies from Columbella in particulars of 

 almost generic importance, not only in the apex but in the 

 turriculated habit. It has no known living form in Australia. 



Natica vixumbilicata, n.s. Shell globose, smooth, shin- 

 iug, very finely cancellate, which is visible only with a lens ; 

 spire acute, slightly exsert as a more finely rounded coil ; 

 whorls 6. The apical 4, small, round, and distinct, only 

 slightly increasing in size, the last two becoming suddenly 

 globose, aperture semilunar ; outer lip thin, inner lip everted 

 anteriorily into an acute projecting angle, umbilicus small 

 narrow, deep, slightly callous above, with a conspicuous groove 

 leading to it from the anterior angle of the lip. Long. 20, 

 lat. 13^, long apert. 12, lat. 7, diam. of umbilicus 1^. 



CucuLL^A CAiNOizoiCA. U.S. Shell roundly trigonal, ob- 

 lique, globose, smooth, faintly and closely marked with radia- 

 ting ribs and concentric striae, the latter well defined and 

 somewhat rugose at the margin and sides, umbones very 

 acute and recurved ; ligamental area, arched, broad, with six 

 straight grooves on each, which are well defined and overlap 

 each other alternately under the umbo, hinge teeth, 6-7, bent 

 under the hinge and then bicuspidatc, muscular impressions 

 lanceolate, well defined, the anterior adductor with a slightly 

 lamellar edge, margin finely pectinated with very distinct 

 crenulations which continue in young shells all round as far 

 as the hinge. Young shells are also more quadrate and 

 have the angular ears slightly developed. Altogether the 

 shell is intermediate between Cuculloea and Pectunculus and 

 partakes somewhat of the character of both genera. 



NucujL-A TUMiDA. n.s. Shell small, solid, obliquely tri- 

 gonal, tumid truncated anteriorly, slightly produced and 

 rounded posteriorly, finely wrinkled with consecutive irregular 

 rounded ribs, increasing in thickness from umbones to mar- 

 gin, and irregularly grooved with deep consecutive lines of 

 growth, margin thickened and bilabiate, hinge teeth small 

 diverging progressively in an increasing series, interrupted by a 

 narrow deep ligamental pit, largest teeth slightly bent, 

 anterior row short, eight in number, the distal ones smaller, 

 but all high and lamellar, umbones fine and sharply incurred ; 



