1890.] ON THE HABITS OF XENOPUS L^VIS. 



69 



27. Rosa, D. — Sull' assenza dei Receptacula seminis in alcuni 

 Lumbricidi. Boll. Mus. Zool. Torino, vol. iv. (1889), no. 71 . 



28. Claparede, E. — Histologische Untersuchungen iiber den 



Regenwurm. Zeitschr. wiss. Zool. Bd. xix. (1869). 



29. Vejdovsky, F. — System u. Morphol. der Oligochseten. Prag, 



1884, p. 78. 



30. Barfurth, D. — Vergleichend histochemische Untersuchungen 



iiber das Glycogen. Arch. mikr. Anat. Bd. xxv. (1885). 



31. Blundstone, E. R. — On the Occurrence of Glycogen as a Con- 



stituent of the Vesicular Cells of the Connective Tissue of 

 MoUusca. P. R. Soc. vol. xxxviii. p. 44 I . 



EXPLANATION OF THE PLATES. 

 Plate IV. 

 Fig. 1. Perichata indica, nat. size ; drawn and coloured from a living specimen. 

 2, 3. Anterior segments of Perichceta indica, to show protrusion of buccal 

 cavity. 



4. Anterior segments of Perkkata hiserialis. 



5. Clitellar and following segments of Perichata forhesi. 



6. Perichceta forbesi ; segments 7-12, dissected, to show position of sperraa- 



ttiecae and thickened septa. 



7. binerialis ; corresponding dissection of segments 6-10 to show 



thickened mesenteries. 



Plate V. 

 Fig. 1, 2, 3. Variations in position of genital papilla in Perichceta affinis, fig. 2 

 being the normal. 

 4. Perichceta indica ; transverse section through duct of spermatheca. 



5. ; transvei-se section through spermathecal appendix. 



6. ; a portion of a transverse section of wall of spermatheca. 



7. forbesi ; portion of sperm-sac modified by presence of gregarines. 



8. indica ; spermatheca. 



9. ; longitudinal section through intersegmental septum to show 



attachment of "glycogenic" organ (^Z); d.v, dorsal blood-vessel; 

 mes, septum ; i, epidermis. 



10. Genitalia of Perichceta vaillanti ; v.s, sperm-sacs ; x, process of ditto, 



which appears to meet that of its fellow in the dorsal median line ; 

 ov, ovary ; od, oviduct ; n, nerve-cord ; m, intersegmental septa. 



11. Anterior segments of Perichceta affinis; pr, minute prostomium. 



12. Perichceta houlleti ; dissection to show increase in size of seta near ven- 



tral median line ; s, seta ; ii, nerve-cord ; m, intersegmental septum. 



4. Notes on the Habits and Oviposition oi Xenopus laevis. 

 By J. M. Leslie, F.Z.S. 



[Eeceived January 11, 1890.] 



At the suggestion of Mr. Boulenger ' I have, for the last two 

 years, been investigating the life-history of the Clawed Aglossal 

 Frog, Xenopus Icevis, Daud., which is common here at Port 



' [Mr. Leslie's observations on the oviposition of Xc7wpiis Icsvis fill up a 

 desideratum of long standing. The development of Pipa being of an ultra- 

 specialized type, we have to fall back on the only other genus of Aglossa for 

 information on this head. What we know of the structure of the Aglossa showa 



