276 University of California Publications. [ ZooLoGY 
so loosely connected that in the broader frond-lke portions. 
lacune frequently oceur where zocecia have apparently failed to 
form, thus producing the open and irregular appearance pecu- 
liar to this species. 
B. laxa occurs in considerable abundance on Channel Rocks. 
Puget Sound. Found in small quantity in material from Pacific 
Grove. 
Beania Johnston. 
Beania Johnston, 1847, ed. II, p. 372. 
Diachoris Busk, 1852, pt. I, p. 53. 
Zoarium subecorneous or ecaleareous, erect or decumbent. 
Zoccia sessile or suberect, scattered, or in loosely connected 
groups, united to one another by slender tubes originating from 
the dorsal or lateral surfaces; aperture occupying the entire 
front, the margin usually furnished with hollow spinous pro- 
cesses arching over the opening; mouth terminal. 
As here defined, Beania is intended to include the genus 
Diachoris of Busk, Hineks, Jullien, and others, following the 
usage of MacGillivray and Waters. Hincks (785) regards Dia- 
choris of Busk as an artificial division but considers it to be 
more nearly related to Bugula because of its boat-shaped zocecia 
and articulated avicularia. These characters do not, however, 
distinguish Bugula alone, whereas the peculiar mode of connec- 
tion of the zocecia by tubes of varying length forms a good diag- 
nostic character common to both Beania and Diachoris as orig- 
inally defined. 
24. Beania mirabilis Johnston. 
Pl. XII, figs. 63, 64, and text figure 1. 
Beania mirabilis Johnston, 1847, p. 372, text figs. 69, 70. 
Beania mirabilis, Busk, 1852, pt. I, p. 32, Pl. XXIV, figs. 4, 5. 
Beania mirabilis, Smitt, 1867, pp. 295 and 357. 
Beania mirabilis, Hincks, 1880, p. 95, Pl. IV, figs. 8-10. 
Zoarium consisting of numerous minute branching tufts, 
some of which are free, some adherent to the substratum by 
means of rootlets given off from each zocecium (fig. 63). Zoawcia 
