110 



species appear nviciilaria, which are generally capitate and pedunculate or trumpet- 

 shaped. The radical fibres, which run down along the basal side of the colony 

 issue far distally on the individual zoa'cia. The colonies are elegant tufts with 

 biserial branches. 



This genus which will most probably be split up later into several includes 

 the majority of the species in the old genus Bicellaria\ and the only species 

 known to me which remains in this genus is B. ciliata. One of the characters 

 which, in a narrower sense, separates the genus Bicellaria from Cornncojnna, is 

 the sharp constriction between the wider funnel-shaped terminal portion of the 

 zoa>cium and the proximal cylindrical portion, and Corniicopina yrandis in this 

 structural feature approaches Bicellarid, as we lind at the same place internally 

 a narrow, ring-shaped, oblique, chitinous thickening. This species also occupies 

 a special position within the genus in having a cryptocyst (fig. 5 a), already ob- 

 served by Harmer-, which extends under the larger part of the frontal mem- 

 brane and reaches almost to the operculum. It is provided with hnely curved 

 and dentated edges, and it rises dislally from the deeper, proximal part to end 

 in a free, shovel-shaped plate. Two successive zooecia are connected by a multi- 

 porous rosette-plate, which is surrounded l)y a calcareous ring, and this is again 

 connected with a similar ring surrounding the adjacent rosette-plale of the lateral 

 wall (fig. ii a — 5 b). Busk has overlooked the very large plump avicularia, which 

 in this species here and there issue from the basal surface of the zooecia a little 

 proximally to the outer margins (fig. 5 c). 



Beania Johnston. 

 Diachoris. 



The very slightly calcified zon-cia are mutually connected by cylindrical lubes 

 to a more or less open network, which is attached to the underlayer by radical 

 fibres arising from the basal surface of the individual zocjecia; each lube is fiirii- 

 ished with a multiporous rosette-plate; no oa-cia; as a rule freely movable 

 avicalariu. 



While all the species, which I have been able to examine of this genus, have 

 an operculum, such according to Busk's^ account and figures, is lacking in 

 Diachoris tmujclUtnicn, in which the aperture is said to be surrounded by a circu- 

 lar thickened rim. If this account is correct, this sjjecies must jjrobably be re- 

 garded as the re[)resentalive of a s])ecial genus, and this inii;lil tlu'ii retain the 

 old iianie Diaclwris. — In the sj)ecies from Ita[)allo, which Waters calls />'. 



' 8, p. 31. - 111, p. .cjii 



