623 



— .which, when treated with reagents stains deeply — closely packed 

 together form the walls. Irregularly scattered on the interior, are 

 other cells larger in size and enclosed by a hyaline envelope of varying 

 size and possessing one or two nuclei. The centre is occupied by seve- 

 ral, and at times by numerous, chitin like capsules, the debris of those 

 that have parted with their protoplasmic contents. Surrounding these 

 are others some partially, others completely developed; those in the 

 former condition allowing the knife — in sections — to pass through 

 the entire body and display the contents uninjured; while in the latter, 

 the chitinous envelope being fully formed has splintered under the 

 treatment, and shews its striated structure — under high powers — 

 the protoplasmic contents being indistinguishable owing to the preserv- 

 ing reagents having failed to penetrate the hard protecting envelope. 



A fully matured psorosperm taken from a freshly ruptured psoro- 

 sperm mass may be described as follows; externally: a fine, hyaline, 

 envelope, possessing one or two nuclei : this envelopes a thick chitinous 

 capsule, almost spherical, in shape and measures 0,75 mm in diameter. 

 This encloses a spherical mass of protoplasm, which is easily liberated 

 by careful use of the compressorium. 



I have repeatedly tried the iodine and sulphuric acid test but re- 

 gret I have been unable to obtain the same results as Dr. Wierzejski. 



The free bodies in the tentacles are visable in section and teazing. 

 Thus are spherical, naked, and measure as near as possible 0,75 mm in 

 diameter. So far I have been unable to find them on their way thicker 

 but I am still in hopes of doing so. 



I have tried almost every reagent possible ; my most successful 

 preparations being those treated with osmic acid and stained with picro- 

 carmine. 



5. Rectification. 



Par Paul Garnault, 



Docteur ès-sciences et en Médecine, 



Chef des travaux de Zoologie à la Faculté des sciences de Bordeaux. 



eingeg. 20. October 1888. 



Dans mon travail sur le Cyclostoma elegam^, j'ai dit que l'artère 

 aorte antérieure passait au dessus du connectif qui relie le ganglion 

 sus-intestinal au ganglion genito- cardiaque. Si ce fait était exact, les 

 relations qui existeraient entre le système nerveux redressé et l'artère 

 aorte antérieure seraient les mêmes que chez les Pulmonés. Il n'en 



1 P. Garnault, Recherches anatomiques et histologiques sur le Cyclostoma 

 elegans. p. 29. Paris, Masson. Bordeaux, Feret, 1888. 



