277 
Diplograptus spp. 
There are a large number of specimens of other species present,, 
but most are small and not well preserved. They may be young. 
Diplograptus {Orthograptus) quadrimucronatus (J. Hall). 
Plate xxxiv., Figs, io,‘ n. 
Hydrosome reaching a length of about 40 mm. and a width of 4 mm., 
parallel sided and tapering to the sicular end, the nature of which is 
not shown in the present specimens. Before compression the hydrosome 
appears to have been quadrangular in section. Thecae straight, 
quadrangular in section, usually preserved in an almost scalariform 
manner on one side of the virgula, while the series on the other merely 
indents the margin. A strong spine developed on each side of the 
aperture, those on one side projecting from the present free edge—those 
on the other, which are barely visible, now lying near the virgula. At 
the level of about the 7th or 8th thecae are four prominent spines about 
2.5 mm. long. 
[About 10 examples], 
Cryptograptus tricornis (Carruthers). 
{See Hall, T. S. ; Proc. Roy. Soc. Viet. 18 (1905), p. 22, pi. 6. fig. 4). 
These specimens agree perfectly with those I have from Mt. 
Wellington, 
[7 examples]. 
Climacograptus baragwanathi, n. sp. 
Plate xxxiv., Fig. 6. 
Hydrosome tapering for about 2 cm., where it is about 2 mm. in 
width. Thence on it is parallel sided, and may reach a total length 
of 50 mm. Virgula distinct, and close to it appears to be another 
solid rod which runs the length of the hydrosome. Virgula free for 
6 or 7 mm. Thecae 10 in 1 cm,., only shown in the present specimens 
in a scalariform manner. Attached to the sicular end is a network 
of fine threads, which is ill-defined in shape, but rather transversely 
elongate. 
Lapworth has figured some Diplograptidae in the “ Catalogue of West* 
ern Scottish Fossils,” and in his paper on the Graptolites of Co. Down, 
with vesicles attached to the sicular end, but all are shown as having 
well defined margins. In the present species all that is visible is a 
network of apparently irregularly branching and anastomosing fibres, 
resembling the hydrorhiza of a recent hydro-id, or the anchoring organ 
of some of the polyzoa. I offer no suggestion as to its use. 
Dedicated to Mr. Wm. Baragwanath, jun., who has done such good 
geological work in the district whence these fossils came. 
[5 examples]. 
Climaco graptus bicornis (J. Hall). 
Plate xxxiv., Fig. 8. 
The specimens are typical. 
[36 examples]. 
Glossograptus, sp. 
Plate xxxiv., Fig. 9. 
Four examples of a Glosso graptus are present, but all are imperfect. 
