Prof. P. J. Van Beneden on the Intestinal Worms. 343 



Fig. 3. Sponffilla Carteri, thin section of, passing through the liilutn : o, cel- 

 hxlar coat composed of hexagonal cohimns of cells, of which see 

 a more magnified view in fig. 4 ; 6, coriaceous coat ; c, spherical 

 cells, of which see one more magnified, 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 pol3'gonal 

 (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 ; stai-ch-grains of different sizes from the interior of 

 the coriaceous coat, originally formed in the spherical cells. 



Fig. 8. Lophopus ?, winter-egg or statoblast of, about l-27tli of an 



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

 round, to save time and trouble) ; b, coriaceous coat ; c, cirrhoua 

 appendages. 



Fig. 0. Ditto, ditto, portion of surface of cellular coat, more magnified, 

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

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

 end of the hexagonal cell to ihffer sUghtly 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. 



Fig. 14. Ditto, ditto, starch-grains of different sizes from the cavity of the 

 coriaceous coat, originally formed in the spherical cells. 



Fig. 15. Ditto, ditto, cirrlious 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 the 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 w^as 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, Doctem- en Sciences et en Me'decine, 

 Professeur de Zoologie et d' Anatomic comparee a I'Universite 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, 1859. in-4°. 



