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Show species described above, but, judging from Collingwood's figure, in the arrangement of the eye-spots it is sufficiently distinct. Literature. 1. B er g e n d a l . " Kongl. Fysiogr. Sallskapet," Lund Handlingar, Ny Foljd, 1892-93, Bd. 4. 2. C ol l in gwo od . Trans. Linn. Soc. Lond. ser. 2, Zool. i. 1875, p. 83, pis. 17-19. 3. G r a f f , von. Zeitschr. wiss. Zool. Iv. 1893, p. 189. 4. L a id l a w . Fauna and Flora of the Maldives and Laccadives, i. p. 282, pis. xiv., xv. • 5. ------ Mem. & Proc. Lit. & Phil. Soc. Manchester, xlvii. p. 1 (1903). 6. Lang. Naples Monogr. xi., 1884. 7. P l e h n , von. Jena. Zeitschr. xxx. p. 137, t. viii. & xiii. 8. Ergebn. Plankt.-Exp., Heft i., 1896. 9. Semon's Zoologische Forschungsreisen, Bd. v. pp. 329- 334, t. xxiii. 10. Abh. Senckenb. Gesell. xxiv. ii. pp. 145-146 (1897). 11. Jena. Zeitschr. xxxi. p. 90, t. v. (1898). 12. Zool. Jahrb. Syst. xii. pp. 448-452 (1899). 13. S tum m er -T r a u n f e l s , von. Zeitschr. wiss. Zool. lx. p. 688, t. xxxv.-xxxviii. 14. V e r r i l l . Trans. Connect. Acad. viii. p. 459, pi. xliv. 15. „ „ ix. p. 523. 16. W oodw o rth. Bull. Mus. Comp. Anat. xxxii. 4, pp. 63-67, pi. i. (1897). EXPLANATION OF PLATE X X I I I . Fig. 1. Spine from tlie lumen of the penis of Planocera sp., p. 302. 2. Section passing through the penis and prostate organ of Notoplana evansii, p. 302. 3. Transverse section through the penis of Leptoplana malayana, p. 306. 4. Transverse section through the penis and prostate gland (?) of Bergendalia anomala, p. 310. 5. Section through the rudimentary organ of penis-like structure of the same species, p. 311. 6. Section through the spiral part of the vagina of the same, p. 312. 7. Section across the antrum masculinum of Asthenoceros ivoodivorthi, p. 315. These organs are directed obliquely forward, and consequently both appear in some of the sections. The granular appearance of the prostate in this region is rather exaggerated in the figure, but it becomes more marked towards its extremity. 8. Bergendalia anomala, p. 306. 9. Pseudoceros bedfordi, fragment of anterior part of body, p. 314. 10. Pseudoceros ? rubellus, p. 314. Explanation of Lettering of Plate and Text-figures. 318 ON THE POLYCLADS OF THE " SKEAT EXPEDITION." [Apr. 21, a.m., antrum masculinum. a.m.l., muscular walls of antrum masculinum. d.e., ductus ejaculatorius. d.pr., prostate duct. ep., epidermis. m.pr., muscular walls of prostate. t., tentacles m.v., muscular sheath of vagina. va., lumen of vagina. p., penis. v.d., vasa deferentia. pp., vestigial penis ? t\s., vesicula seminalis. pr., prostatic cells. I pr.c., chamber of the prostate. pro., prostate. ppr., prostate-like organ. s., septum between chamber of prostate. st., stylet of penis. |