71 
Explanation of Plate III. 
Fig. 1. Cyclocystoides halli, Billings. A small specimen stowing the system of ridges 
radiating from the centre. This is the specimen from which the camera- 
lucida drawing in the text was made. The figure is | larger than natural 
size. 
“ 2. Cyclocystoides kuronensis, Billings. A photograph of the type, showing the 
radiating ridges on the disk, the small sub-marginal plates, and, on the 
right hand side, the vertical outer plates of the ring which surrounds the 
disk. Natural size. 
“ 3. Cyclocystoides halli, Billings. One of the cotypes of the species. This speci- 
men shows the ring of sub-marginal plates, the two spoon-shaped depres- 
sions on each plate, and, in. the region at the upper part of the picture, 
the vertical outer plates. In the lower left-hand side of the photograph 
the covering plates may be seen in position, outside the tuberculatcd parts 
of the sub-marginal plates. This figure is about three times natural size. 
“ 4. Cyclocystoides halli, Billings. A small specimen, showing the lower side. On 
this side the outer portions of the plates of the sub-marginal ring are not 
excavated. 3i times natural size. From Mr. Narra way's collection. 
“ 5. Eoharpes dentoni, (Billings). A complete specimen. Natural size. 
“ 6. Eoharpes ottaivaensis, (Billings). A photograph of the type, recently presented 
to the Survey by Sir James Grant. Natural size. 
“ 7. Holasaphus moorei, Raymond. An incomplete cranidium, supposed to belong 
to this species, j larger than natural size. 
“ 8. An hypostoma supposed to belong to the above species. 4 larger than 
natural size. 
" 9. A free cheek supposed to belong to Holasaphus moorei. 4 larger than natural 
* size, 
“ 10. Holasaphus moorei , Raymond. An imperfect pygidium. About natural 
size. 
“ 11. The same species. A nearly perfect pygidium. About natural size. 
“ 12. Bumastus hillingsi, Raymond and Narraway. A large specimen recently 
presented to the Survey by Sir JameB Grant. Figure introduced to show 
the truncation of the pleura of the anterior segments of the thorax. 4 
smaller than natural size. 
