420 



Eeport of the State Geologist. 



1883 Macgjllivaby. Proc. Koyal Soc. of Yictoria, Aug. 9. 



1883 Caldwell. Proc. Koyal Society. 



1884 Lahkester. Quart. Jour. Micro. Sc. 



1884-6 Busk. Eeport on the Polyzoa collected by H. M. S. 

 Challenger during the years 1873, 1874. 



1885 Habmee. On Loxosoma. Quart. Jour. Micro. Sc, April. 

 1885 Laneestee. Encyclopedia Britannica, article Polyzoa. 



The Cell.* 

 The typical Bryozoan, (fig. 1) is composed of a sac, with walls 

 ormed of an inner and outer layer, the endocyst, Plate I, fig. 1, 



Fig. 1, Diagram showing the structure of a single polypide of a Brj^ozoan (after Busk): t. Ten- 

 tacles; m, Mouth; ce, CE^ophagus; s, Stomach; i. Intestine; a. Anus: z. Funiculus; x. Testis; 

 o, Ovary ; r. Retractor muscles ; g, Nerve ganglion ; v. Tentacular sheath ; cl, Perigastric space ; 

 c, Ectocyst ; or, Aperture of the zooecium (after Busk) . 



u, and the ectocyst, fig. 1, c, and PI. A, ^g. 1, v. The outer 

 layer is usually chitinous or calcareous, though in some forms 

 it is gelatinous and sometimes entirely wanting, though this is 



* In writing this paper on the recent Bryozoa I make no claim to original investigation, but have 

 placed the results of the study of the literature of the subject in such a form that the student can 

 readily obtain a clear idea of the morphology of these animals, as at present known. 



