133 



■flange is flat or sliglitly convex, ornamented with close fine 

 sinuous growth-lines and by inconspicuous spiral threads ; the 

 •coronal flange is obliquely wrinkle-ridged on both sides, raised 

 into depressed scales on the outer side, particularly on the an- 

 terior whorls. Last whorl contracted very much from the 

 middle of the base, which is defined by a strong thread coinci- 

 dent with the posterior angle of the aperture, and prolonged 

 into a very long and very narrow slightly flexuous beak ; base 

 lirate (about ten), with alternating slender threads crossed by 

 close imbricating lamellae of growth ; the beak is ornamented 

 with oblique raised threads alternately large and small, 

 w^rinkled across by scaly lamellae. 



Aperture angularly rounded ; outer lip thin, running out 

 into a narrow canal at the keel, in front of which the margin 

 is serrated, and lirate within ; inner lip continuous, with outer 

 lip at the top, somewhat thickened to the pillar beyond which 

 it is continued as a sharp thin lamina. 



Dimensions of a moderate-sized specimen : — Length, 44^ ; 

 breadth in front of: flange, 11 ; length of aperture, 8 ; of canal, 

 25. Dimensions of figured specimen, of which the canal is in- 

 complete-. — Length, 44; breadth, l(j ; aperture height, ll'o ; 

 breadth, 9 ; length of canal, 19. 



Localities. — Lower beds at Muddy Creek and blue clays at 

 Schnapper Point. 



This beautiful fossil is so much like the Challenger species, 

 F. pagodoides, "Watson, taken at a depth of 410 fathoms off 

 Sydney, that it might easily be mistaken for it. The very 

 ample description and figure of that species, however, permit 

 to point out differential and distinctive characters : the fossil 

 has a much smaller apex, is densely lirate on the anterior and 

 base of body whorl, the beak is not prickly, and the coronal 

 fringe is largely developed on all the whorls except the three 

 apical ones. 



2. Fusus acanthostephes, spec. nov. Plate vii., fig. 7. 



Shell fusiform, rather thin, with a turreted spire ending in 

 a small sphaeroidal apex, the next whorl very narrow and 

 angulated ; the rest of the whorls (six) excessively angulated 

 and coronated at the keel with large erect or radially extended, 

 compressed, hollow spikes. Last and penultimate whorls with 

 three rounded serrated ridges on the posterior slope, reduced 

 to one on the middle whorls and entirely absent on the earlier 

 ones. Base of last whorl ver}^ contracted and precipitous, 

 ornamented with four or five angular keels, the third from the 

 coronal fringe serrated, the others carrying short, crowded 

 recurved prickles. Beak encircled with prickly ridges. Mar- 

 gin of outer lip serrate-dentate, grooved within. 



