161 



Length, less the canal, 16 ; breadth, 15*5 ; aperture, length, 

 11 ; width, 6-5. 



Locality. — Lower beds at Muddy Creek. 



Genus De:n"2^antia. 



Name in compliment to Mr. J. Dennant, F.G-.S., who has 

 placed his very extensive collection of the Muddy Creek 

 fossils at my service. 



Type. — Eusus Ino, Tenison Woods. 



Generic Characters. — Shell elongate, turriculate ; aperture 

 prolonged into a moderately long, sharply bent and reverted 

 canal ; columella with an oblique fold ending at the point of 

 the pillar in a tooth-like projection ; base of body whorl with 

 a revolving ridge coincident with the posterior angle of the 

 mouth and ending in a pointed projection on the thin outer lip. 



This genus combines the form of Fastigiella with the aper- 

 ture of Leucozonia and the canal of Peristeomia. 



STIN'OPSIS OF SPECIES. 



Lirately ridged or striated. 1. D. Ino. 



Spirally furrowed. 2. D. cingulata. 



1. Dennantia Ino, T. Woods. PI. xii., figs, la— Ic and 3. 



Fusus Ino, Tenison- Woods, Proc. Lin. Soc, N.S.W., vol. iv., 

 p. 13, tab. 3, fig. 10, 1S79. 



Shell elongate-turriculate, rather stout ; whorls eight and a 

 half, of moderate increase, ending a rather large obtuse apex 

 of two and a half smooth tumid whorls with the tip depressed 

 and centrally immersed. 



Anterior whorls convex, suture well impressed, encircled with 

 slender, acute lir?e (about seven on the penultimate whorl, but 

 the number is very variable), the wide interspaces with spiral 

 threads and microscopic transverse closely-set striae, arched 

 growth-lines and indistinct folds occur at irregular intervals. 



Body whorl regularly convex to the basal keel, then suddenly 

 contracted into a moderately long twisted beak. 



Aperture ovate ; outer lip thin, interrupted by the projection 

 of the basal keel, behind which it is slightly incurved, lirate 

 within ; inner lip defined behind by an impressed line continued 

 to near the extremity of the canal, provided with an oblique 

 fold arising from a short denticle at the junction with the 

 canal. 



Length, 26'5 ; breadth, 10 ; length of aperture 8, of canal 6. 



Localities. — One of the commonest fossils in the lower beds at 

 Muddy Creek ; blue clays at Schnapper Point ; G-astropod-bed 

 of the River Murray Cliffs, near Morgan. 



Mr. Tenison- AYoods founded this species on a young example 



K 



