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 scattei'ed 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. 

 Yagina 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. Iv. 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). 



EXPLANATION OF PLATE IX. 



Pig. 1. Paraplanocera aurora, sp. nov. (p. 102). X Ij. 



Pig. 2. Section through the region of the male apparatus of Disparoplana duhia, 

 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 anatomj' of FJiylloplana lactea, sp. nov. (p. 107). X IJ. 

 Transverse section across the bodj^ oi Saploplana elioti, sp. nov. (p. 109), in 



the neighbourhood of the pharynx. 

 Anterior end of Ommatoplana tuherculata, sp. nov. (p. 111). X 5. 

 Part of a transverse section across the bodj' of Ommatoplana tuherculata 

 passing through two of the tubercles. 

 Pig. 7. Part of a transverse section of ditto, showing the prostate, penis, and penis- 

 sheatli. 



Explanation of Lettering. 



a.7n. 



h., 



cJi.s. 



d.e.. 

 9- 



m.C; 

 m.d.. 



m.l.i.. 



m.l.o. 



n.. 



antrum masculiuum. 



basement membrane. 



chitinous spines. 



ductus ejaculatorius. 



gut. 



gut-branches. 



circular muscles. 



diagonal muscles. 



inner longitudinal miiscles. 



outer longitudinal muscles. 



nervous tissue. 



ov., ovaiy. 

 p., penis. 

 p.s., penis-sheath. 

 ph., pharynx. 



ph.t., pharyngeal pouch. 



pr., prostate. 

 ps.r., pseudorhabdites. 



s., spermatozoa. 

 sli.gl., shell-glands. 

 te., testis. 

 ut., uterus. 



vs., vesicula seminalis. 

 v.d., vas deferens. 

 x, tissue of tubercle-process of Om- 

 matoplana, perhaps nervous in 

 character, 

 .y, gap in muscles of the dorsal body- 

 wall of Ommatoplana tuher- 

 culata. 



Proc. Zool. Soc— 1903, Vol. II. No. VIII. 



