Little-Knoivn Victorinn FofislLs. 339 



spaces beiiif^ concave. The annuli cease near the marginal 

 extremity, and the shell-surface bears numerous, vertical, 

 superficial wrinklings pointing to an affinity with the vertically 

 striated species of the genus. 



Observations. — This species resembles T. gracilistriatus, J. Hall,^ 

 in the breadth of the distal end of the shell, but is devoid of the 

 fine longitudinal striae seen in that species. In its neat and 

 rather closely annulated shell-surface T. matlockiensis approaches 

 T. bellulus. Hall-'; but the latter foi-ni is always much more 

 slender. 



Occurrence and Horizon. — In the slaty shales of Mount 

 Matlock ; presented to the National Museum by Mr. N. 

 Lepoidivil. [1131-2]. Siluro-devunian. 



Genus Coleolus, J. Hall. 

 Coleolus (?) aciculum, J. Hall. (Plate XXXL, Fig. 7). 



Coleolus aciculum, J. Hall, 1879. Pal. N.Y., vol. v., pt. ii., 

 p. 187, pi. xxxiiA., tigs. 11-15. 



Observations. — In the series of Silurian fossils obtained during 

 the work of the Yai'ra Improvements excavations, tliere are at 

 least two specimens which are in all probability referable to the 

 abf)ve species. Both specimens have lost the slender aciculate 

 extremity, and are therefore regarded as similar to Hall's species 

 only in a provisional sense, in the absence of complete specimens. 



The angle of divergence of the lateral margins of the shell, and 

 the faint and irregular surface markings, tend to confirm its 

 identification with C aciculum, which was described from the 

 N. American Devonian (Genessee Slates). 



Occurrence afid Horizon. — Found in the blue and yellow 

 mudstones at South Yarra, and near Prince's Bridge. Collected 

 by Mr. F. Spry. Silurian (Melbouniian). [1130 and 1174]. 



Genus Hyolithes, Eichwald. 

 Hyolithes novellus, Barrande. (Plate XXXI., Fig. 8.) 



Hyolithes novellus, Barrande, 1867. Syst. Sil., vol. iii., p. 86, 

 pi. XV., figs. 23-24 ; pi. xvi. (?), fig. 18. 



1 J. Hall, Pal. N.Y., vol. v., pt. ii., 1879, p. 173, pi. xxxi., figs. 12, 13, 14; pi. xxxi.\., 

 figs. 37-47. 



2 hoc. sup. clt., p. 160, pi. xxxi., fijfs. ir>-18 ; pi. xxxiA., tigs. 48-51. 



