BKYOZOA OF THE PHILIPPINE REGION 



439 



Fig. 173.— Family Catcnicellidae Busk, 1852 



A. Vittaticella elegans Busk, 1852. Section of a ciliated embryo in the ovicell, 

 X400. (After Waters, 1913.) 



B, C. Pterocella (Catenicella) alata Wy . Thompson, 1858. Dorsal and frontal face 



D. ScuticeUa (Catenicella) veniricosa Busk, 1852. Frontal face of the extrem- 

 ity of the branch. (B-D. After Jullien, 1888.) a. Appearance of the ligament 

 containing the rudimentary polypide. b. Ligament in which the endocyst, de- 

 veloped by the multiplication of the mesenehymatous elements, projects outward 

 in the form of a vesicle. The rudimentary polypide is represented by the black 

 spot which occurs close to the bottom of this ligament, c. Zooecial ligament 

 in which the embryo has been carried. They are almost entirely covered by the 

 elements of the mesenchyme, d. Very young zooecium on which appears the 

 apparition of the lateral daughter zooecium with a young polypide in the rudi- 

 mentary Btate. On its superior part, below the operculum, there is found a young 

 zooecium very little like its apparition. One may note in this figure that the 

 new buds do not await the zooecium in order to show themselves that the zoo- 

 ecium from which they depend has attained its complete development. This 

 method of budding is almost general among the bryozoa. e. Chitinous ligaments 

 almost empty of mesenehymatous tissue. They appear always on the zoo- 

 ecium which follows them. /. Compensation chamber in various stages of de- 

 velopment, a. Fenestrae of Busk. These are chitinous productions, h. Young 

 polypide of a zooecium. 



E. Vittaticella elegans Husk, 1852. Section showing zooecium with polypides 

 anil ovicell- {qv) in position, X85. 



F. Vittaticella elegans var zanzibarensis Waters, 1913. Section- showing in- 

 ternal zooecial muscles. (E, F. After Water-, L913.) 



