Prof. P. J. Van Beneden on the Intestinal Worms. 34$ 



Fig, 3. Spongilla Carteri, thin section of, passing through the hilum : a, cel- 

 lular coat composed of hexagonal columns of cells, of which see 

 a more magnified view in fig. 4 ; b, coriaceous coat ; c, spherical 

 cells, of which see one more magni^ed, fig. 5 ; d, hilum ; e, funi- 

 culus entire ; sometimes the cellular coat is prolonged over the 

 funiculus. 



Fig. 4. Ditto, ditto, vertical portion of the cellular coat, more magnified, 

 showing that the hexagonal columns are composed of polygonal 

 (heptahexahedral ?) cells : a, coriaceous coat. 



Fig. 5. Ditto, ditto, spherical cell of, with granular contents, more mag- 

 nified. 



Fig. 6. Ditto, ditto, portion of granular contents of spherical cell separate : 

 a, larger granules, lenticular and bearing buds (?). 



Fig. 7' Ditto, ditto ; starch-grains of difl^erent sizes from the interior of 

 the coriaceous coat, originally formed in the spherical cells. 



FHg. 8. Lophopus ?, winter-egg or statoblast of, about l-27th of an 



inch long : a, cellular coat (here also the cells have been made 

 round, to save time and trouble) ; 6, coriaceous coat ; c, cirrhous 

 appendages. 



Fig. 9. Ditto, ditto, portion of surface of cellular coat, more magnified, 

 showing the hexagonal form of the cells : a, circular area of the 

 centre which is more transparent than the rest, thus causing the 

 end of the hexagonal cell to differ slightly from that of Spon* 

 gilla, fig. 2. 



Fig. 10. Ditto, ditto, thin vertical section of, through the centre longitu- 

 dinally : a, coriaceous coat or cell ; b, spherical cells of ditto ; 

 c, equatorial rim round ditto, extending to the margin of the 

 statoblast ; d, cellular coat. 



Fig. 11. Ditto, ditto, vertical portion of cellular coat, more magnified, to 

 show that the hexagonal columns are composed of single cells, 

 instead of a plurality of cells, as in Spongilla. 



Fig. 12. Ditto, ditto, spherical cell with contents more magnified. 



Fig. 13. Ditto, ditto, portion of granules of, separate. 



Figc 14. Ditto, ditto, starch-grains of dififerent sizes from the cavity of the 

 coriaceous coat, originally formed in the spherical cells. 



Fig. 15. Ditto, ditto, cirrhous appendages of, more magnified. 



Bombay, Feb. 9, 1859. 



XXXV. — Researches on the Intestinal Worms. 

 By Prof. P. J. Van Beneden*. 



The Academy of Sciences at Paris proposed, as tlie subject of a 

 prize-essay, to determine by observation and experiment the de- 

 velopment of the intestinal worms, and the modes by which they 

 are transferred from one animal to another. It was required 

 also, by well-established facts of anatomy and embryology, to 

 illustrate the natural affinities of these worms. 



* An abstract, by Prof. J. Van der Hoeven, of the * Memoire sur les Vers 

 intestinaux' par P. J. Van Beneden, Docteur en Sciences et en Medecine, 

 iProfesseur de Zoologie et d' Anatomic comparee a rUniversite de Louvain, 

 &c. Avec 27 planches. Memoire qui a obtenu de I'lnstitut de France 

 (Academic des Sciences) le grand prix des Sciences physiques pour I'annee 

 1853. Paris, J. B. Bailliere et fils, 1869. m-4''. 



