24 Hall : Victorian Graptolites. 



Dicranograptus nicholsoni, Hopkinson. 

 (PI. VI., Fig. 7). 



Biserial part 6 mm. long, with 6 or 7 thecae on each side ; 

 increasing in breadth from 0.7 mm. at the proximal end to 

 1.5 mm. at the point of bifurcation. Uniserial branches 

 straight ; 7 cm. long (broken) ; width 1 mm. ; axillary' angle, 40 

 deg. Thecae 10 in. 1 cm., strongly curved, with laterally facing 

 apertures opening into deep excavations which indent the 

 branch for about a third of its width. Spines on the first two 

 or three thecae of the uniserial portion. 



The only difference noticeable from the species as described 

 by Miss EUes and Miss Wood is that in the British examples 

 the uniserial portion is of even width throughout, while in ours 

 there Is an increase. This is probably not of sufficient import- 

 ance for a specific difference, and moreover I have but a single 

 specimen. 



Dicpanograptus hians, n. sp. (PI. YL, Fig. 6). 



Biserial portion about 3 mm. in length and 1 mm. broad, 

 with about three thecae on each side. Axillary angle. 90 deg., 

 the uniserial branches slightly cundng towards one another, 

 their length being about 6 cm. and breadth 1 mm. Thecae 

 with slightly curved ventral margins and horizontal apertures ; 

 12 in. 1 cm. The thecae of the uniserial portion are spined, 

 and there is a distinct virgella. 



The species belongs to group 2 of JNIiss Elles' and Miss 

 Wood's subdivision of the genus, but is quite unlike either of 

 the contained species. The wide angle of divergence of the 

 branches suggests the specific name. 



DESCRIPTION OF PLATE YL 



1.— Diplograptus thielei, n. sp. x 1. 



2. — Climacograptus wellingtonensis, n. sp. (?) ; a larger 



specimen than usual, x 1. 

 3. — Climacograptus wellingtonensis, n. sp. x IJ. 

 4. — Cryptograptus tricornis, Carruthers. x 1. 

 5. — Dicellograptus elegans, Carruthers. x 1. 

 6. — Dicranogiaptus hians, n. sp. x 1. 

 7. — Dicranograptus nicholsoni, Hopkinson. x 1. 



