152 



Length, 46 ; breadth, 18"5 ; aperture, length 15, breadth 8.5 ; 

 length of canal, 13. 



Locality. — Lower beds at Muddy Creek. 



7. Fasciolaria rugata, spec. nov. Plate viii., fig. 3. 



This species very much resembles F. cryptoi^loca, but differs 

 by its fewer and more rapidly enlarging whorls, which are 

 about equally sloping from the periphery to the sutures ; the 

 €anal is shorter and strongly twisted. 



There are ten sharp plications on each of the anterior whorls, 

 and the encircling lir^ (ten to twelve on the penultimate whorl) 

 are equal-sized, and the surface is usually more rugged by the 

 edges of the imbricating lamellae than in the allied species. 



Dimensions of the type specimen, with six and a half whorls : 

 — Length, 45 ; breadth, 23 ; length of aperture 17, of canal 10. 



Localities. — Blue clays at Schnapper Point ; and lower beds 

 at Muddy Creek {J. Lfennant!). 



Gexus Peeisteenia. 



I find it convenient to include under this generic title those 

 fusoid shells having a sharply sinistrally bent canal, with one 

 strong fold on the columella, or with two or more slender 

 plaits additional, and others with a short canal having the 

 columella characters, which I cannot with any degree of confi- 

 dence refer to established genera or subgenera. 



Some of the species, by their long slender canals with two or 

 more plaits, differ from Fasciolaria only by the obliquity of the 

 beak. P. approximans is more typical ; whilst the small group 

 of species congregated around P. succincta approaches Tudicula. 

 Lastly, there are two small Trophon-like shells, with a very 

 short twisted canal, that cannot consistently be referred to 

 Troplwn on account of the oblique j^lait on the columella. 



Unacquainted with the majority of the genera of the family 

 established on Tertiary fossils by Conrad, Bellardi, and other 

 pala?ontologists, I refrain from creating new groups out of the 

 heterogeneous assemblage of species which I have brought to- 

 gether under Feristernia. 



SYNOPSIS OF SPECIES. 



Peristome not continuous. Apex subacute or mamillate, 

 smooth. 



"Whorls angulated, costated. 



Stoutly lirate ; apex subacute. 1. P. approximans. 

 Last whorl convex, without costse. 



2. P. purpuroides. 

 Finely lirate ; apex mamillate. 



Whorls equally lirate ; apex small. 



3. P. Morundiana 



