Australian Tertiary Fleurotomarias. 87 



remarkable breadth of the fascicle, and lack of sculpture, are 

 features worthy of special attention in this new species. 



III. — Pleupotomaria, n.sp. 



A new species of Pleurotomaria was recorded liy the late Pro- 

 fessor R. Tate in his list of the Eocene fossils from Cape Ot\vay,i 

 a,nd this is subsequently included in M. Vincent's list of Eocene 

 species of this genus,'- but I am unaware of any published 

 remarks, description, or figure of this form, and not having seen 

 the specimen, I am unable to give any further information con- 

 cerning it. 



Very imperfect specimens of a high spired form of this genus 

 have been obtained from the Eocene limestones of Waurn Ponds, 

 near Geelong, by Mr. T. S. Hall and myself, but the material 

 yet to hand is too meagre to permit of specific determination. 



Our Tertiary representation of this genus appears to be excep- 

 tionally good when compared with that of other countries, but 

 befoi'e noting the other Tertiary records, there are some points of 

 relationship and classification upon vvhich I would like to 

 comment. 



Fischer has divided the recent species into two sections, 

 Perotrochus, typified by P. quoyana, Fischer and Bernardi, and 

 Entemnotrochus, typified by P. adansoniana, Crosse and Fischer. 



Perotrochus has been defined as:— Form conical, base not 

 umbilicate, whorls striate or granulate, anal fascicle sub-median 

 or below the middle, slit short. 



While Entemnotrochus is characterised as follows : — Shell 

 ccnoidal, striate, umbilicate; anal fascicle a little above the 

 middle of the upper surface of the last whorl, slit long, but not 

 exceeding the half of a whorl. 



McCoy remarks of P. tertiaria* that it " is almost intermediate 

 in character between the two living ones," the two referred to 

 being P. quoyana, and P. adansoniana. 



1 Trans. Roy. Soc South Australia, vol. xix., pt. i., p. 112, 1895. 



2 Soc. Roj-. Malac. de Belg., vol. xxxi., 189C, but not (listributt;d till 24tli December, 

 1899, p. 56. 



3 Prod. Pal. Vic, Dec. iii., p. 23. 



