Victorian Fossils, Part X. 106 



The specimen here figured measures 27 mm. in length, and its 

 greatest width is 6 mm. 



It is of much interest to note that Mr. Cowper Reed has 

 already identified a form of Trachyderma, which he provision- 

 ally refers to the above species, in the Silurian (Zebingyi Beds) 

 of Burma. 1 



Occurrence. — Silurian (Yeringian). In olive brown mudstone, 

 Geol. Surv., Vic. coll. B23, at junction of the Woori Yallock 

 and Yarra. Also a doubtful specimen, in grey shale, of the 

 same series from View Hill Creek, near Yering ; Geol. Surv. 

 Vict., coll. BU. 



Class, Crustacea. Super-order, Cirripedia. 



Tnrri/epas, H V^^oodward. 



Turrilepas ornatus, sp. nov. 



(PI. XXVI 1 1., Fig. 1 ; PI. XXIX., Fig. 2). 



Description. — The characters of this species are based on two 

 plates from different localities, in the same division of the 

 Silurian. That selected as the holotype is a single lateral or 

 kite-shaped plate, not quite perfect in outline, but sufficiently so 

 to enable a comparison to be made with the other described 

 forms, and especially with T . mitchelli, Eth. fil.,2 from Bowning, 

 N.S. Wales. This plate is preserved in a grey mudstone, and 

 a ferruginous stain brings out the details of the surface orna- 

 ment. The outline of the plate is ovate or leaf-shaped, and 

 pointed at the apex, but the point is not so extended as in 

 T. scotica, Eth. fil.,^ a difference also remarked by Mr. 

 Etheridge in the case of the Bowning specimen.^ The line of 

 the central fold is marked by a strong rounded keel, which 



1 Mem. Geol. Surv. India, Pal. Ind., N.S. vol. ii., Mem. 3, 1906, p. 129, pi. vil., fig. 17. 



2 Etheridge, R., jnr., "On the occurrence of the Genus Turrilepas, H. Woodw., and 

 Annelid Jaws in the Upper Silurian (? Wenlock) Rocks of New South Wales." Geol. Mag., 

 N.S., dec. iii., vol. vii., 1890, p. 338, pi. xi., figs. 1, 2, 4, 5. 



3 Silurian Fossils of the Girvan District, vol. i., 1880, p. 214, pi. xiv., figs. 22-27 (cf. 

 figs. 22-24). 



4 Op. supra cit., p. 338. yv v*^,--- 



IujILIBRARY 



