17 



a muscular tissue. This tissue is composed of fasciculi of 

 muscular fibres, running perpendicularly towards the ten- 

 tacula, with others crossing them at right angles, and 

 surrounding the body with muscular rings.' The meshes 

 formed by the interlacement of these two sets of muscular 

 fibres, are filled with granules of a glandular nature. The 

 tentacula, which are also used to aid, by their agitation, in the 

 floating movement above described, are, like the abdominal 

 portion of the Animal, composed of the compound layers of 

 muscular fibres. The Bryozoa are not locomotive. The most 

 familiar example of one species is the Flustra of our own shore 

 — of the cylindrical Bryozoa, the Bowerbankiamay be named 

 as a specimen. This class of animals, although fixed during 

 the adult state, possesses locomotive power in the ova state, 

 which is then performed, as in the former classes, by cilia. 

 We may, however, in this class, mark an advance in this 

 part of the animal system. We perceive a distinct 

 development of muscular apparatus, used, it is true, for a 

 double purpose, but ready to be moulded into a specific 

 organ of locomotion in the next stage of advancing 

 organization. 



*#* The second part of this paper, the author stated, will 

 embrace the Polygastrica, Entozoa, Epizoa Kotifera, 

 Acalephse, and the Echinodermata. 



Mr. Sweetlove illustrated his paper by very beautiful 

 drawings of the different classes of animals described. 



