1885.] 



Presents. 



361 



tudinally, and give rise to a continuous cavity — the pericardial cavity. 

 The portion of this cavity containing the generative cells become 

 separated from the rest as two tubes which form the generative 

 glands and part of their ducts, and come to lie ventral to the peri- 

 cardium in the central compartment of the body cavity. The external 

 parts of the generative ducts appear to be derived from the modified 

 leg cavity of the anal papillae. 



I have no satisfactory observations on the development of the 

 heart ; but it appears to arise from the cells in the dorsal middle line 

 which intervene between the two dorsal divisions of the somites 

 before they unite with one another across the middle line. 



The slime glands are epiblastic in origin. They first appear as an 

 invagination of ectoderm, at the apex of each oral papillae. They 

 have nothing to do with nephridia. 



I have no observations on the development of the crural glands, 

 neither have I been able to see anything of the development of tracheae. 

 I trust that the Society will deem the foregoing results of sufficient 

 interest to justify this short preliminary, but I fear too long delayed, 

 account of my observations on the development of Peripatus capensis. 

 The delay has been occasioned by the fulfilment of engagements 

 which were undertaken before I went to the Cape, and have proved 

 more arduous than I had anticipated. My observations are nearly 

 completed, and the greater part of the drawings are made ; and I 

 trust that the detailed account will soon— before the autumn — be 

 ready for publication. 



The Society adjourned over the Whitsuntide Recess to Thursday 3 

 June 11. 



Presents, April 16, 1885. 



Transactions. 



Amsterdam : — K. Akademie van Wetenschappen. Jaarboek. 1883. 

 Afd. Letterkunde. Derde Reeks. Deel 1. 8vo. Amsterdam 

 1884. Juditha et Adolescentis Meditatio. 8vo. Amstelodami 



1884. Afd. Natuurkunde. Processen-Verbaal. Nos. 1-9. 

 1883-4. Verslagen en Mededeelingen. Tweede Reeks. Deel 

 19-20. 8vo. Amsterdam 1884. Naam-en Zaakregister. Deel 

 1-20.' 8vo. Amsterdam 1884. The Academy. 



Cambridge : — Philosophical Society. Proceedings. Vol. V. Parts 

 1-3. 8vo. Cambridge 1884-5. Transactions. Vol. XIV. 

 Part 1. 4to. Cambridge 1885. The Society. 



Delft : — ficole Poly technique. Annales. Livr. 2. 4to. Leide 



1885. . The School. 



