42 Anatomy of Sagartia Schilleridna [No. 1, 



in fig. 2, pi. XI). The functions of these internal canals have 

 not as yet been traced out; I even failed to observe their ex- 

 tensions into the internal space. Gosse, and others, suppose that the 

 eggs and spermatozoa are ejected through them, though I usually 

 observed these conveyed through the mouth. The tubercles placed 

 on either side of the gonidial canals, have been called lentigines, they 

 are smaller than the others, and bipartite, (see / in fig. 2 of pi. XI). 

 There also often extends a groove from the gonidial canal towards the 

 periphery, which has been termed gonidial radius, but this is hardly 

 traceable in our species. The greenish or pale fleshy colours are 

 occasionally very distinct on the lips, and the internal muscular tissue 

 of the latter is stronger, than that of the disk and of the tentacles. 



g. The throat is the immediate continuation of the lips into the 

 interior ; it is longitudinally sulcated, the furrows being marked by 

 greenish lines, produced by the contraction of the pigment layer. 

 The length of the throat from the lip to the larynx, is about half an 

 inch ; towards the base it is slightly enlarged, and then forms a 

 strong projection (the larynx) into the inner space. 



h. All along the throat the inner muscular layer, with the scleroids, 

 is rather consistent, and especially so at the larynx, where it is very 

 tough and nearly cartilaginous, often more so than at the bases of the 

 septa themselves. This muscular strength of the lips, of the throat, 

 and especially of the larynx, is of course indispensable for the existence 

 of the animal, being not only required for the seizure of the prey, in- 

 tended for food in the stomach, but also for its retention. 



i. The stomach, the internal axial cavity, is produced by an 

 insinuation of the inner margins of the septa, these projecting 

 to a greater or lesser extent into its space. The stomach extends 

 from the larynx, which guards its entrance, to the base of the 

 column. When the animal is expanded, the height of the stomach 

 measures about § of the total height of the column. Gosse states that 

 in some species, he observed internally on the septa thin, coloured 

 layers, and is inclined to explain them as a sort of a substitute for I 

 the liver. Nothing of these layers was observable in any of the 

 specimens of the present species examined. The stomachial cavity 

 is the receptaculum of the food, and contains besides several other 

 organs which are placed peripherically. 



