370 



Plate III. 



Fig. 1 a. A composite colony of Bugula caliculata 

 n. sp. X 3. 



— lb. The same species with ooecia. X 40. 



— 1 c. Zooecia of the same species with ocecia, 



from the basal surface. X 40. 



— 1 d. An incipient colony of the same species. 



X 23. 

 — ■ 1 e. Another incipient colony of the same spe- 

 cies. X 23. 



— If. An incipient colony from the basal surface. 



X 23. 



— 1 g. An old zooecium and the adjacent internode 



of the stem, seen half from the basal sur- 

 face. The calcified lateral border, which is 

 a continuation of the distal wall, is seen. 

 Between the zooecium and the internode 

 an internode of a new stem is beginning. 

 X 40. 



— 1 h. The proximal end of a young colony. X 40. 



— 1 i. A part of a young colony, on which an 



internode of a new stem begins between 

 the proximal zooecium and the adjacent 

 Internode. X 40. 



— 1 j. A part of a young colony from the basal 



surface. X 40. 



— 1 k. Two stem-internodes. X 40. 



— 11. The adjacent ends of two internodes of the 



stem. On the lower the distal wall and one 

 of the lateral thickenings are seen, on the 

 upper the two lateral thickenings annularly 

 connected in the proximal end of the inter- 

 node. X 100. 



— 1 m. Two adjacent internodes of the stem, be- 



tween which a new one is beginning. The 

 lateral thickenings and the parietal muscles. 

 X 100. 



— In. The distal end of a new-formed internode 



of the stem (in an inverted position) with 

 parietal muscles. X 100. 



— 1 o. A new-formed stem-internode beginning be- 



tween two older ones. X 40. 

 — 1 p. An avicularium of the same species. X 100. 



Fig. 1 q, A transverse section through a stem-inter- 

 node to show the two lateral thickenings. 

 X 100. 



— 2 a. Bugula caraibica n. sp. XI. 



— 2 b. The same species. A part of a branch, from 



the frontal surface. An avicularium is seen'. 

 X 40. 



— 2 c. The same species. Ooecia. X 40. 



— 2d. The same species, from the basal surface. 



Distal walls and ooecia are seen. X 40. 



— 2 e. A young colony of the same species. X 17. 



— 2 f . A somewhat older colony with a single long 



stem-internode. X 17. 



— 2 g. A stem-internode of the same species. At 



the upper end the original place of one of 

 the fan-shaped branches is seen. X 17. 



— 2 h. Another internode of the stem of the same 



species, X 17. 



— 2 i. The distal end of a stem-internode, more 



highly magnified. The internal supporting 

 ribs of the distal wall are seen and the 

 rosette-plates of the fan-shaped lateral 

 branch. X 40. 



— 2 j. The distal end of a stem-internode in an- 



other position. The bent distal wall with 

 its rosette-plates and supporting-ribs is seen. 

 X 40. 



— 2 k. A transverse section through a stem-inter- 



node. The two lateral thickenings are seen. 

 X 55. 



— 2 1. The distal wall of an internode of the stem, 



viewed from above. X 75. 



— 2 m. A longitudinal section through the upper- 

 , most end of a stem-internode. The distal 



wall with its rosette-plates and one of the 

 lateral thickenings are seen. X 75. 



— 2n. Another longitudinal section through the 



uppermost end of a stem-internode. The 

 distal wall's supporting-ribs are seen and 

 the distal wall of the lateral branch. X 75. 



— 3 a. Two stem-internodes of Bugula glabra 



(Hincks). X 40. 



