370 



Plate III. 



Fig. 1 a. A composite colony of Kugiila caliculala 

 n. sp. X A. 



— lb. The same species witli oii-cia. X 40. 



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



from the basal surface. X 40. 



— Id. An incipient colony of the same species. 



X 23. 



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



cies. X '2'.i. 



— If. An incipient colony from the basal surface. 



X 23. 



— 1 t;. An old zod'cium and the adjacent internode 



of the stem, seen half from the ))asal sur- 

 face. The calcitied lateral border, \yhich is 

 a continuation of the distal wall, is seen. 

 Between the zocecium 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 pro.vimal zocecium and the adjacent 

 internode. X 40. 



— 1 j. A part of a young eolon>' from the basal 



surface. X 40. 



— Ik. 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 pro.ximal end of the inter- 

 node. X 100. 



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



tween which a new one is beginning. The 

 lateral thickenings and the parietal mu.scles. 

 X 100. 



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



of the stem (in an inyerted position) with 

 parietal muscles. X 100. 



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



tween two older ones. X 40. 

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



— 2( 



— 2( 



- 2g 



— 2h. 



Fig. 1 q, A transyerse section through a steni-inter- 

 node to show the two lateral thickenings. 

 X 100. 



— 2 a. Riigiila caraibica n sp. X 1. 



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



the frontal surface. An ayicularium is .seen. 

 X 40. 



The same species. Ooecia. X 40. 

 Id. The same species, from the basal surface. 



Distal walls and oiecia are seen. X 40. 

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

 f A somewhat older colony with a single long 

 stem-internode. X 17. 



.\ stem-internode of the same species. At 

 the ujjper end the original place of one of 

 the fan-shaped branches is seen. X 17. 

 Another internode of the stem of the same 

 species. X 17. 



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. 



The distal end of a stem-internode in an- 

 other position. The hent distal wall with 

 its rosette-plates and supporting-ribs is seen. 

 X 40. 



A transverse section tliiough a stem-inter- 

 node. The two lateral thickenings are seen. 

 X 5.'-.. 

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

 yiewed from above. X 7.'j. 



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 7.). 



2n. Another longitudinal section through the 

 upi)ermost 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 Bugiila glabra 

 (Hincks). X 40. 



- •'2.i- 



— 2 k. 



