162 



with miicli of the outer lip broken awa}^, and as the whole as- 

 pect is so totally different from a perfect matured shell it was 

 needful to refigure the species, and for this purpose I selected 

 a specimen which agreed the best with the original diagnosis. 

 The species is subject to much variation ; examples from the 

 Hiver Murray Cliffs are much shorter and broader than the 

 type, an extreme form having a breadth equal to half the 

 length. Pig. 3 on tab. 12 represents a variety common at 

 Schnapper Point, in which the encircling ridges are very promi- 

 nent and angular, and somewhat roughened by the intercross- 

 ing of growth-folds. 



2. Dennantia cingulata. Plate xii., figs. 2 and 5a— oh. 



A rather more slender form than D. Ino, with linear encirc- 

 ling furrows. In the form represented by fig. 2, the broad sur- 

 face is simply scored by lines, whilst in the form represented 

 by fig. 5 the grooving is deep and moderately broad, though not 

 so wide as the rounded ridges. Xow and again a thread ap- 

 pears in the furrows. 



Locality. — Blue clays, Schnapper Point. 



Gexus Leucozoxia. 



STKOPSIS or SPECIES. 



Shell pyriform ; spiral stri» microscopic. 1. L. micronema. 

 Shell ovate-globose ; spiral ornament of fine distant threads 

 and stri». 2. L. staminea. 



Shell globosely turbinate ; lirse stout, close. 



3. L. tumida. 



1. Leucozonia micronema, spec. nov. Plate ix., fig. 12. 



Shell small, pyriformly ovate, apex mamillate of one and a 

 half whorls, the tip obliquely depressed. Whorls below the 

 apex three, slightly overlapping behind, concealing the suture; 

 microscopically wavy-striated in a spiral direction, the strias 

 hardly visible on the base of the last whorl ; marked trans- 

 versely by striae and linear folds of growth. 



Aperture elongate-oval ; outer lip lirate within, margin (?) ; 

 columella with six narrow, nearly transverse plaits, rather 

 close together, decreasing in size from the front, the anterior 

 one much the largest ; canal short, stout, wide, straight, a little 

 upturned at the end. 



Leugth, 11 ; breadth, 6 ; length of canal and aperture, S. 



Localiti/. — Blue clays at Schnapper Point. 



This little fossil is apparently congeneric with Buccinum 

 rostratiim, Wood, the generic position of which is very doubt- 

 ful, but placed by Gray in his genus Leucownia under the sub- 

 generic title of Lagena. 



