PEOF. W. A. HASWELL ON AUSTEALASIAN POLTCLADS. 483 



Tlie female aperture leads into an antrum which takes the form of a bursa copulatrix 

 M'ith very thick walls. The ootype has a very contracted lumen with folded walls ; 

 it extends dowuAvards to the neighbovirhood of the ventral svirface. The shell-glands 

 are very highly developed, extending through more than one-half of the length of 

 tlie body. 



In a specimen which has been cut into longitudinal vertical sections there is beneatli 

 the integument of the dorsal surface, in the region immediately behind the sucker, a 

 great mass of spermatozoa, and a similar mass on and around the sucker on the ventral 

 surface. The sections are imperfect, and thougli a fissure enclosing spermatozoa is to 

 be traced downwards from the dorsally situated mass, it is impossible to determine 

 to what extent this has been formed by fost-mortem treatment. In any case there 

 is sufBeient evidence of the occurrence here of an indirect form of copulation by 

 perforation of the integument. 



In view of this observation it is of interest to note that Lang expresses a suspiciotv 

 that the structure of the parts in ProstJilostomum points to self-fertilization (17, p. 638). 



From ProstMostomum siphunculus, Delle Chiaje (sp.), and from P. dohrml, I.ang 

 (17), this Australian species is distinguished by the number and arrangement of the 

 eyes; and similar differences distinguish it from Laidlaw's (15) two species, P. elegam 

 and P. cooperi, from the Maldives. 



Bibliography. 



1. Beruendal. — ^\mge BQvaevkxmgen uhcv Cryptocelides Loveni. Kongl. Fysiogr. Sallskapets Hand- 



lingar, Ny foljd, iv. 1892, 3*. 



2. Cheeseman, T. F. — On two new Planarians from Auckland Harbour. Trans. N.Z. Inst. xv. 1882. 



3. CoLLiNGWooD, C. — On thirty-one Species of Marine Planarians, &c. Trans. Linn. Soc, Zool. (2) 



i. 1876. 



4. Gamble, F. W. — British Marine Turbellaria. Quart. Journ. Micro. Sci. xxxiv. 1893. 



5. Goto, S. — -Studies ou the Ectoparasitic Trematodes of Japan. Journ. Coll. Sci. Imp. Univ. Japan, 



viii. 1894. 



6. GuAiF, L. VON. — Enantia spinifera der Rcpriisentant einer neuea Polycladen Familie. Mittheil. 



naturwiss. Vereins fiir Steiermark, 1889. 



7. Haswell, W. a. — On a Prorhynchid Turbellarian from Deep Wells in New Zealand. Quart. 



Journ. Micro. Sci. vol. xl. n. s. 1898. 



8. On a new Histriobdellid. Quart. Journ. Micro. Sci. vol. xliii. n.s. 1900. 



9. Heuzio, E. M. — Laid/awia Irinonopora, n. gen., n. sp. Zool. Anz. xxix. 1905 



10. Kirk, T. W. — On some new Marine Planarians. Trans. N.Z. Inst. xiv. 1881. 



11. Laidlaw, F. F. — Notes on some Marine Turbellaria from Torres Straits and the Pacific. Mem. 



and Proc. Manch. Lit. & Phil. Soc. xlviii. 1903. 



12. A Collection of Turbellaria Polycladida from the Straits of Malacca (Skeat Expedition). 



P.Z. S. 1903, i. pp. 301-318, pi. 23. 



• I have not been able to see this paper. 



