135 



5) No avicularia; (the ooecia more or less deeply immersed in the 



zooecia) Bugulopsis Verrill. 



(Cellularia Hincks). 



5) Avicularia occur: 



6) Each marginal zocecium with a large marginal avicularium, the 

 greater part of which is immersed in the zocecium and shows a strongly 

 arched wall inside the latter; (the other zooecia with a completely 

 membranous frontal area and no avicularia; no spines; no ooecia; the 



colony with multiserial branches) Hoplitella n. g. 



6) Where marginal avicularia are found they are never partially 

 immersed : 



7) A number of zooecia on one margin of the branches have two 

 huge, hollow spines on the proximal side of the frontal area; (a free 



stem formed by numerous radical fibres, etc.) Rhabdozoum Hincks. 



7) No hollow spines proximally to the frontal area Menipea Lamouroux. 



Caberiella n. g. 



Small, narrow, curved or angularly bent vibracula appear on the basal side 

 of a number of zooecia. They are divided into a distal and a proximal cavity by 

 a septum and occupy only a small part of the basal surface of the colony. Avi- 

 cularia occur. The radical fibres are given off partly from a chamber connected 

 with the vibraculum, partly from a pore-chamber. They form a bundle along 

 each lateral margin of the colony. 



G. benemunita Busk. 

 Menipea benemunita Busk, 

 Challenger Zoology, Vol. X, Part 1, pag. 19, PI. IV, fig. 4. 

 (PL XXII, figs. 8 a-8 b). 

 The zooecia are long and narrow with a gymnocyst occupying about two- 

 thirds of the entire length of the zocecium. There is a well-developed, deeply 

 immersed, secondary cryptocyst, which is densely and finely granular especially 

 in its distal half, and provided with a finely dentate inner margin. Right at the 

 distal end it appears as a more deeply-placed, curtain-like lamina, the free 

 margins of which end in 6—8 teeth. Besides the large, long, scutiform opercular 

 spine, furnished with a bifurcate hollow and covering the greater part of the 

 frontal area, the zocEcia have 3—4 spines distally, one on the same side as the 

 opercular spine and 2—3 on the opposite (i. e. outer) side. Three spines only on 

 the marginal zooecia. 



