154 



mella with two stout plaits, umbilicus narrow and deep. Length, 

 6 ; breadth, 3-5. 



Locality. — Lower beds at Muddy Creek ! 



C. laticostata may be regarded as a diminutive C lifcmastoma, 

 Sowerby, from the Gallapagos Islands, but has a little longer 

 spire and broader jDlications. 



The species name is preoccupied by Kuster for a recent shelly 

 which is i^robably C. sinensis, Reeve, a variety of C. aspereUa, 

 Lamarck, but under the circumstances it is not desirable to sub- 

 stitute another name for our fossil. 



3. Cancellaria alveolata, spec. nov. Plate x., fig. 7. a-b. 



Shell small, thin, ovate-ventricose ; spire short, turbinate ending' 

 in a small blunt pullus of one and a half smooth depressed turns. 



Whorls three and a half, moderately convex, separated by a 

 linear channelled suture ; equally and equidistantly lirate, five on 

 the penultimate whorl, the posterior one margining the suture ; 

 lira3 rounded, depressed, about equal in width to the interspaces, 

 which are roundly pitted by the intercrossing of slender sigmoid 

 threads. Aperture ovately oblong, angularly rounded at the 

 front, but not channelled ; outer lip varicosely thickened, the edge 

 inflected and crenulated, smooth within, slightly insinuate at the 

 suture ; peristome entire ; columella arched, obscurely one-plicate. 

 Perhaps not a Cancellaria. 



Dimensions. — Length, 4-5 ; breadth, 3 ; length of aperture, 3, 



Locality. — Lower beds at Muddy Creek. 



4. Cancellaria epidromiformis, spec. nov. Plate viii., fig. 9. 



Shell thick, ovately elongate, with a sub-turreted spire ending 

 in a small obtuse apex of one and a half turns. Whorls five,, 

 excluding pullus, convex, narrowly and deeply excavated at the 

 suture, the shoulder rounded and coronated ; varices four, at 

 irregular intervals ; ornamented with slender, oblique, subacute 

 cost?e (about 24 on penultimate whorl) and spiral lira? (about five 

 on penultimate whorl), bluntly tuberculose or granulose at the 

 junctions ; interspaces between the liraj with about four or five 

 threads, minutely granular or scaly produced by close-set longi- 

 tudinal stria?. 



Aperture oblong ; outer lip varicosely thickened, plicate within ; 

 columella lip expanded, columella with three stout plaits ; body- 

 wall with a stout spiral ridge and a few carunculations. 



Dimensions. — Length, 20 ; breadth, 10 ; leng-th of aperture, 10, 



Locality. — Lower beds at Muddy Creek. 



5. Cancellaria exaltata, spec. nov. Plate viii., fig. 10. 

 Shell like C. ejndromi/ormis, but rather narrower, with the 

 sutural channel less defined, and with certain differences of orna- 



