58 



THE SEA-ANEMONE. 



and forms the means of attachment. At the centre of the mem- 

 brane of the fringed free end (A) of the body is an elongated 

 opening with a scalloped outline. This is the mouth. From this 



a flat sac (fig. 29, I, II,) 

 projects as far as half- 

 way to the bottom of 

 ib the cavity of the cylin- 

 der, and each side of 

 this stomach, as it is 

 26 called, corresponds to 

 the two elongated sides 



B/ 



of the mouth. At its 

 \id end there is an open- 

 ing which leads into 

 the space which sur- 

 rounds it, the so-called 

 digestive cavity (d). 

 The latter is divided into numerous chambers, (, d,) extending 

 from one end of the cylinder to the other, by thin semi-partitions 

 (p, p 1 ) which, at one edge, are attached, always in close-set 

 pairs (numbers 1, 1#, &c., to 5, 5a, &c.) for their whole length, 

 to the interior of the cylinder ; at each end they are united to 

 the transverse membrane, or, as they are called, respectively, the 

 floor of the oral disc (fig. 28, A,) and the floor of the base (P) ; 

 and lastly, along their edges, which are turned toward the centre, 



Fig. 29. Cereus Sol. Verrill. 2 diam. From Charleston, S. C. A fore- 

 shortened view of the interior, from just behind the mouth, backwards to a point 

 a little behind the posterior end of the stomach (I, II). rf, the general digestive 

 cavity ; I, spaces between the pairs of partitions, the arrows indicating the pas- 

 sage-ways to and from the general cavity (rf) ; p, p 1 , the two partitions of one of 

 the largest pairs; m, the muscular layer on the opposite faces of p, p 1 ; *, f, the 

 reproductive organs, which in profile (fig. 28) appear like a deep frill along the 

 edges of the partitions, extending from the posterior end (fig. 28, P) of the body 

 toward the head ; I, II, the two plicated, upper and lower, edges of the flat 

 stomach; 1, la, 16, Ic, Id, le, the six pairs of the first set of partitions; 2, 2a, 

 26, 2c, '2d, 2e, the six pairs of the second set ; 3, 3a, 36, &c., the twelve pairs of 

 the third set; 4, 4a, &c., the twenty-four pairs of the fourth set; 5, 5a, 56, &c., 

 the forty-eight pairs of the fifth set. Original. 



