96 Frederick Chapman : 



Occur7'e?ice. — Silurian (Yeringian). In limestone, Cave Hill^ 

 Lilydale. Collected by the Rev. A. W. Cresswell. M.A. 



Fam. Pyramidellidae. 



Genus Loxonema, Phillips. 



Loxonema sinuosa, Sowerby sp., var. australis, nov. (Plate V., 

 Fig. 39). 



? Terehra sinuosa, Sowerby, 1839. Silurian System, p. 619, pL 

 VIII., fig. 15. 



Loxonema sinuosa, Sow. sp., Phillips, 1841. Pal. Foss. Cornwall^ 

 p. 99, pi. XXXVIIL, fig. 182. Salter, 1859, Siluria, 3rd ed., pL 

 XXIV., fig. 3. 



Ohservaiions. — The present specimen is fragmentary, only por- 

 tions of two whorls being preserved. The form of the shell and the 

 ornament is, however, so well indicated as to leave little doubt of 

 its very close affinity to Sowerby's species. The folds are straight 

 and sharply ridged, and the sinuosity well marked, whilst there is 

 a tendency to form a faint nodose shelf near the basal part of the 

 whorl. This latter constitutes a varietal feature. 



L. sinuosa has been recorded in Great Britain from the Upper 

 Llandovery beds, the Lower Ludlows and the Aymestry Limestone. 

 Prof. Phillips also recorded it from the PetherAvin Group of Corn- 

 wall, referred by Jukes-Browne to the Famennian or Upper 

 Devonian. 



Occurrence. — Silurian (Yeringian). In limestone, Cave Hill^ 

 Lilydale. Presented by Mr. J. S. Green. 



Fam. Capulidae. 



Genus OPthonychia, Barrande, 



Orthonychia brevis, sp. nov. (Plate V., Fig. 40). 



Descrijjtion. — Shell conical, slightly curved, less than a quarter 

 of a volution in 12 mm. Convex side of shell evenly rounded, inner 

 surface elliptically convex. Apex compressed and sulcated on the 

 inner side. Lines of growth faintly marked. 



Dimensions. — Length of shell about 38 mm. Width of aperture- 

 when complete, about 20 mm. 



Observations. — A described species which affords a close compari- 

 son with the above is 0. subrectum, J. Hall sp.i This shell, however, 



1 Platyceias (Orthonychia) subrectum, J. Hall. Pal. New York, vol. v., pt. 2, 1S79, p. i., pi. i.„. 

 fiffs. 1, 2. 



