140 
Diplograptus tardus , n. sp. 
Plate I., Fig. 2. 
Hydrosome stout, slightly tapering towards the sicular end for about 
10 mm. ; beyond this it is parallel sided. Length, 27 mm. ; breadth, 
2.5 mm. Thecae, 12 in. 1 cm., inclined at about 25 deg. to the virgula. 
Width of aperture, 1.2 mm. They overlap about half their width and 
half their length; prismatic, straight. Free virgula, 2 to 3 mm. Aper- 
tural spines, 1 mm. Three apertural spines seem to be present, though 
only two are generally visible, and make! with the virgella a four-spined 
extremity. 
As is usual in those species, which were evidently lunate in cross- 
section with the thecal openings on the concave side, a film of matrix 
in the hollow above the aperture frequently gives a false appearance of a 
convex outer margin in place of the really straight one. 
Glosso graptus cf. hermani , T. S. Hall. 
Plate I., Fig. 3. 
(See Rec. Geol. Surv., Vic., Vol. I., pt. 1, 1902, p. 34, text fig.) 
Dicrano graptus ramosus var. longicaulis , Elies and Wood. 
Plate I., Fig. 5. 
(E. and W. Monog. Brit. Grap., pt. 4, 1904, p. 177.) 
The specimen figured has a biserial portion 29 mm. long and bearing 
about 24 thecae. The specimen is not well preserved, but the three thecae 
adjacent to the sicula on each side appear to be spined, a feature which 
is absent in the variety as described by its founders. 
The variety has not previously been recorded for Australia. 
Climacograptus bicornis, J. Hall, var. peltifer, Lapworth. 
The specimen agrees, closely with Lapworth’s figure in the catalogue of 
Western Scottish Fossils, and the varietv is new for Australia. 
Dicellograptus sextans , J. Hall. 
Plate I., Fig. 6. 
(See Elies and Wood. Monog. Brit. Grap. (Palaeont. Soc.), pt. 4 
(1904), p. 153.) 
From Thomson River. Quarter Sheet 22, N.W. 
(a) Blazed tree , 23 chains S. of boundary. 
Nos. 1142-1148. Collected by Mr. J. P. L. Kenny. 
Mono graptus cf. dubius , Suess; Nos. 1146, 1148. 
Mono graptus sp., No. 1147. 
(?) Pteropods, Nos. 1142, 1145. 
Unidentifiable, Nos. 1143, 1144. 
Age—Silurian. 
(b) Spur .S.TV. of Blaze XIII., Thomson River. 
Nos. 1149-1163. Collected by Mr. A. A. Henderson, B.Sc. 
Monograptus cf. dubius, Suess, Nos. 1152, 1158, 1160, 1161. 
Mono graptus cf. crenulatus, Tornquist (genus, M onoclimacis, Freeh.), 
No. 1156. 
