226 Prof. T. Thorell on some Fig. 6. E 5619, 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. E 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 in 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. (X 3 diam.) Fig. 12. E 6003, 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. ( X 3 diam.) Cgathocrinus vallutus, sp. n. 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. E 6006, B. M. A cup seen from the right side, showing post.B and x 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. Fig. 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 E. W. Odtes, Esq. By Prof. T. Thorell. Our knowledge of the arachnological fauna of the Andaman Islands is as yet exceedingly limited ; so far as I know M. Eugene Simon is the only author who has, in a recently-published paper *, enumerated and described any spiders * " Etudes sur les Arachn. de l'Asie merid. faisant partie des collec-tions de l'Indian Museum (Calcutta). — II. Arachn. recueillis aux iles Andaman par M. R. D. Oldham," in Journ. of the Asiatic Soc. of Bengal, lvii. part ii. no. 3 (1887).
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