JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE I, 

 Illustrating G, O. Sars's Paper on Rhabdopleura. 



Fig, 

 1. — The animal taken out of the cell and slightly compressed, seen from 

 the left side. 



c. Buccal shield. 



d. Tentacular arms. 



e. (Esophagus. 



f. Stomach. 



g. Intestine. 



h. Contractile cord. 



/. Hyaline semilunar border at base of tentacular arms. 

 m. The under lip. 



n. The ciliated tubercle at the base of the tentacular arm. 

 p. Tlie flexor muscle of the tentacular arm, 

 q. The buccal aperture. 



r. The cellular body between the end of the intestine and the 

 oesophagus. 

 2. — The animal seen from the ventral side. 



(Letters as in hg. 1.) 

 3. — The animal seen from the dorsal side. 



(Letters as in fig. 1.) 

 4. — The anterior part of tiie body seen from in front ; c, d, I, as in fig. 1. 

 5, — A part of a living colony magnified about sixteen times. 



aa. The cells with their polypides in different states of protrusion. 

 bb. The creeping stem. 

 cc. The buccal shield. 

 dd. The tentacular arms. 

 ff. The stomach. 

 g. The intestine. 

 hh. The contractile cord. 

 ii. The axial cord. 

 6. — A piece of the creeping stem freed from adhering particles, together 

 with the bases of the cells and their polypides mostly strongly re- 

 tracted, about 20 times magnified, showing the single chambers into 

 which the stem is divided. 

 cc. The buccal shield. 

 ff. The stomach. 

 hk. Tlie contractile cord. 

 ii. The axial cord. 

 7. — The earliest stage of development noticed. 

 8. — A further developed polypide seen from the dorsal side ; cc, the buccal 



shield ; d, the tentacular arms ; h, the contractile cord. 

 9. — The same polypide with the axial cord {i) seen from the ventral 

 side. 



