226 Prof. T. Thorell oz some 
Fig. 6. E5619, B.M. A ventral sac, slightly weathered. From a 
drawing by Mr. Hollick. (x 2 diam.) 
Fig. 7. 57421, B.M. A small portion of the weathered surface of a 
radial. From a drawing by Mr. Hollick. (x 10 diam.) 
Fig. 8. FE 6002, B.M. <A plate from the proximal region of the ventral 
sac, to show the folding of the edges. Drawn on stone by the 
author. (x 3 diam.) 
Fig. 9. Grindrod Collection, Oxford. The distal end of the ventral sac 
appearing between the branches of the anterior arm. Drawn on 
stone by the author. (Nat. size.) 
Fig. 10 a. 57142, B. M. Three brachials seen from the side, showing the 
covering-plates open. 
b. 57142, B.M. The ventral surface of three brachials, the 
covering-plates removed and the ventral groove exposed. 
c. Grindrod Collection. The ventral surface of three brachials, 
the covering-plates tm situ and closed. 
All from drawings by the author. (x 3 diam.) 
Fig. 11. 57060 and E 6002, B.M. A radial showing the articular facet, 
combined from the evidence of these two specimens. From a 
drawing by the author. (xX 35 diam.) 
Fig. 12. E6003, B.M. Portion of surface of a radial, showing shagreen 
ornament. From a drawing by Mr. Hollick. (x 10 diam.) 
Fig. 13. The articular surface of a stem-ossicle from the evidence of 
numerous specimens, From a drawing by the author. (xX 38 
diam.) 
Cyathocrinus vallatus, sp. 0. 
Fig. 14. 170, Mason College, A radial seen obliquely from above, to show 
articular facet ; also showing ornament. From a drawing by 
Mr. Hollick. (x 2 diam.) 
Fig. 15. Ki 6006, B. M. A cup seen from the right side, showing post.B 
and 2 on the left; outline restored. From drawings by Mr. 
Hollick and the author. (Nat. size.) 
Fig. 16. 170, Mason College. A cup; orientation uncertain. From a 
drawing by Mr. Hollick. (Nat. size.) 
Fig. 17. The articular facet for the stem of the same specimen. From a 
drawing by Mr. Hollick. ; 
Fug. 18. E 6005, B. M. A much weathered cup; orientation uncertain. 
From drawings by Mr. Hollick and the author. (Nat. size.) 
XXXIII.—On some Spiders from the Andaman Islands 
collected by EE. W. Oates, Hsq. By Prof. T. THorE.t. 
Our knowledge of the arachnological fauna of the Andaman 
Islands is as yet exceedingly limited; so far as I know M. 
Eugéne Simon is the only author who has, in a recently- 
published paper *, enumerated and described any spiders 
* “Etudes sur les Arachn, de l’Asie mérid. faisant partie des collec- 
tions de VIndian Museum (Calcutta)—IQ. Arachn. recueillis aux iles 
Andaman par M. R. D, Oldham,” in Journ. of the Asiatic Soc. of Bengal, 
Ivii. part i. no. 3 (1887), 
