THE SEA-ANEMONE. 59 



a part of them join the stomach-wall as far as it extends, and 

 from the entrance to the digestive cavity (fig. 29, d) to its 

 bottom, they all have a free edge (fig. 29, *, f ). 



There are never less than twelve of these semi-partitions, not 

 even in the youngest ; and when more numerous they occur in 

 multiples of six. Thus, in the youngest individuals, we have 

 six pairs (1, la, 11), Ic, Id, le) of twelve, which are attached, 

 two (1) at one edge (II), and two (la) at the other edge (I), of 

 the flat stomach, and the four remaining couples, (Ib, Ic, Id, le,) 

 dividing the area on each side of this organ into three equally 

 broad spaces, (namely, from 1 to Id, from Id to Ib, and from Ib 

 to la,) are joined to it, as at its edges, (I, II,) from the mouth to its 

 opposite opening. From the latter point, all six pairs have free 

 edges, and divide the general cavity, behind the stomach, into six 

 principal broad spaces, or berths, as we might call them, and six 

 narrow berths, which are, respectively, the spaces (I) between the 

 two partitions of each pair. In this way each half of the body, 

 on the right and on the left of the flat of the stomach, is divided 

 into three broad and two narrow longitudinal spaces. In older 

 individuals, each of the broader spaces is divided again by a 

 double partition, (2, 2, 2b, 2c, 2d, 2e,) and in still more advanced 

 ones, each of these twelve are halved in the same way, (3, 3a, 

 36, &c.,) and so on until in very old specimens there are, as I 

 have counted, as many as sixteen times six of these broader 

 berths (d) and as many of the narrower ones (1 to 5). Each of 

 the successively formed sets of berths are, in regular progression, 

 less deep than those which originated before them, and, in like 

 manner, the more recently formed partitions are successively nar- 

 rower (numbers I, la, &c., to 5, 5a, &c.) than the older ones. 



The tentacles, which are hollow, in every instance are placed 

 so as to overlie each narrow space (/) between a pair of parti- 

 tions, and form, as it were, saccular prolongations of these spaces. 

 In the older individuals, the edge of the oral disc is more or less 

 wavy, and the hollow tentacles which cover it form the fringe 

 (fig. 28, a). 



The reproductive organs, which consist of wavy, narrow bands, 



