34 GEORGE OSSIAN SARS. 



together appear to form a thick fascicle of incompletely 

 differenced muscular fibres, penetrating into the stalk of the 

 buccal shield. 



The animal is, with the aforesaid exception of the stomach 

 and the intestine, which are opaque yellow, colourless and 

 transparent. The tentacular arms, and the tentacles, as also 

 the anterior part of the body before the stomach, are 

 covered with numerous very small, irregularly shaped, in- 

 tensely dark violet spots of colouring matter, which also 

 occur on the buccal shield, and especially on its anterior 

 freely projecting extremity, where they are very close 

 togethei', forming a large, roundish, dark spot. In speci- 

 mens in spirits all these parts are dark reddish brown, which 

 probably arises from the diffusion of the dark colouring 

 matter produced by the spirit. 



As above stated, the polypide is without any sort of 

 attachment to the cell, in which it lies quite free. But it is 

 attached by means of a long and thin fleshy cord to the axial 

 cord, which runs throngh the creeping part of the Polyzoa- 

 rium or stem. The attachment does not take place imme- 

 diately at the bottom of the free cell, but at the bottom of 

 the corresponding chamber of the creeping stem, close 

 to the transversal septum which divides the chamber 

 from the next preceding. This cord, issuing from the 

 body of the polypide (figs. 5, 6, &c., h), is of very con- 

 siderable length ; as, when the polypide is expanded, it 

 extends not only through the whole length of the cell, but 

 also through the corresponding chamber of the stem. The 

 cord is, however, very thin, filiform, when fully extended 

 five or six times less than the calibre of the cell, and four 

 times thinner than the stomach. It is of cylindrical form, 

 and lies quite free, without being attached at any point to 

 the wall of the cell ; but it is nearer to the one side (the 

 ventral) than to the other. Along all one (the dorsal) side 

 it is covered with the same sort of small, dark violet spots of 

 colouring matter as the anterior part of the body, tlie 

 tentacular arms, &c., but is otherwise quite colourless and 

 transparent, and is of a soft fleshy consistency. It shows 

 on closer inspection, in a part of its substance, an ex- 

 tremely fine fibrous structure of fine parallel, longitudinal 

 lines and less sharply marked transverse lines ; but in the 

 dorsal part these fibres are entirely wanting, and the struc- 

 ture of this part seems to be cellular, and its edge appears 

 somewhat irregularly wavy. AVith regard to its attachment 

 to the polypide, this does not take place at the bottom of 

 the stomach, but rather high up on the ventral side, where it 



