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Show 1903.] FROM ZANZIBAR AND BRITISH EAST AFRICA. 113 The genus Ommatoplana may be defined as follows:- Body oval, covered on the dorsal side with numerous wart-like tubercles. Eye-spots scattered over the anterior third of the body dorsally. " Mouth " behind the pharynx. A single genital atrium. Penis provided with a true penis-sheath, without a stylet ; prostate gland present, with thick muscular walls. Vagina provided with an accessory vesicle. LITERATURE. 1. LANG.-Naples Monogr. xi. 1884. 2. VERRILL.-Trans. Connect. Acad. viii. pp. 459-520, pis. xl.- xliv. 3. GRAFF, VON.-Zeitschr. wiss. Zool. lv. 1893, pp. 189-219, tt. vii.-x. 4. PLEHN, VON.-Jena. Zeitschr. xxx. pp. 137-176, tt. viii.-xiii. 5. LAIDLAW.-Fauna and Geogr. of the Maldive and Laccadive Archipelagoes, vol. i. pt. 3, pp. 282-312, pis. xiv., xv. (1902). 6. LAIDLAW.-Manchester Memoirs, vol.xlvii.pt. 2, no. v. (1903). Fig. 1 Fig. 2. Fig. Fig EXPLANATION OF PLATE IX. Paraplanocera aurora, sp. nov. (p. 102). X 1J. Section through the region of the male apparatus of Lisparoplana dubia, sp. nov. (p. 103). The section is oblique, and hence it is possible to see the vesicula seminalis in the same section with the anterior end of the penis, which actually lies some distance behind it. The plane of the section is very nearly longitudinal. General anatomy of Phylloplana lactea, sp. nov. (p. 107). X 1^ Transverse section across the body of Haploplana elioti, sp. nov. (p. 109), in the neighbourhood of the pharynx. Fig. 5. Anterior end of Ommatoplana tuberculata, sp. nov. (p. 111). X 5. Fig. 6. Part of a transverse section across the body of Ommatoplana tuberculata passing through two of the tubercles. Pig. 7. Part of a transverse section of ditto, showing the prostate, penis, and penis-sheath. Explanation of Lettering. ch.s., d.e., 9'; m.c. a.m., antrum masculinum. b., basement membrane. chitinous spines. ductus ejaculatorius. gut. gut-branches. circular muscles. m.d'., diagonal muscles. m.l.L, inner longitudinal muscles. m.l.o., outer longitudinal muscles. 7i., nervous tissue. Optra*. •J C O D' ov., ovary. p., penis. p.s., penis-sheath. ph., pharynx. ph.t., pharyngeal pouch. pr., prostate. ps.r., pseudorhabdites. s., spermatozoa. sh.gl., shell-glands. te., testis. ut., uterus. v.s., vesicula seminalis. v.d., vas deferens. x, tissue of tubercle-process of Ommatoplana, perhaps nervous in character. y, gap in muscles of the dorsal body-wall of Ommatoplana tuberculata. PROC. ZOOL. SOC-1903, VOL. II. No. VIII. 8 |