392 RALPH TATE. 
border at each suture, on the second whorl an interstitial thread 
appears contiguous with the anterior band. The third and fourth 
whorls are flat, except for three spiral bands, which ornament it; 
the two thick marginal bands are rudely crenulated, the medial 
smaller one is smooth. Last whorl with antesutural angulation, | 
the sutural slope with two spiral ridges, the posterior one is the 
larger ; the anterior surface carries about twelve elevated angulated 
spiral ridges, which are somewhat unequal in size and not yery 
regularly disposed, the larger ones with coarse blunt crenulations; 
the whole surface sculptured with somewhat sigmoid closely-set 
strie of growth. Length 9, breadth 4:5 mm. 
Eocene, Muddy Creek, Victoria (one example J. Dennant). 
Among the few European species referred to this genus by 
Cossmann, which I have had under examination, Conus scabriculus 
Solander, is the one to which our fossil shows the greatest resem- 
blance. It differs from the European species by thick spiral ribs, 
more numerous on the body whorl, with coarser crenulatures, by 
relatively shorter spire and larger pullus. The species name isin 
compliment to M. Maurice Cossmann, who has so ably advanced 
our knowledge of Australian Tertiary mollusca. 
Family PLevrotomips. 
Subfamily Pievroromina, 
Operculum with an apical nucleus. 
Genus Plewrotoma. 
Sinus upon the keel, canal long. Example, P. perarata, Tate, 
ms. (apud Cossmann) = P septemlirata, Harris. 
Subgenus Hemipleurotoma, Cossmann. 
Canal short, embryo conic. Examples, P. Samueli and murn- 
daliana, T. Woods, apud Cossmann. 
Genus Drillia, 
Sinus near the suture, canal short curved and emarginate ; 
labrum subvaricose, Examples, Drillia integra, D. stiza, D. Trevor, 
Pleurotoma sandleroides and P. pullulescens, Tenison- Woods, 
D. vicumbilicata, Harris, : 
