394 DISCOVERY REPORTS 



The newly formed ovicells have a radially striated entooecium covered by a mem- 

 branous ectooecium continuous with the frontal membrane of the distal zooecium. In 

 older ovicells the entooecium is somewhat roughened, and calcareous plates, similar to 

 those described in Levinsenella borealis by Levinsen (1909, p. 116, pi. i, fig. i2a-c, cr), 

 form under the ovicell and curve round the distal part of the entooecium. In the 

 specimen from St. 153 the ovicells are much flatter (narrower from frontal to basal 

 surface) than in the type specimen from St. 325, and the calcareous plates meet in the 

 mid-basal line. In the more convex ovicells from St. 325 the calcareous plates are only 

 slightly developed and form a narrow strip at each side. There were no ovicells in 

 Kluge's material. 



Kenella Levinsen, 1909 

 1. Kenella biseriata (Busk). 



Flustra biseriata Busk, 1884, p. 54, pi. xvi, fig. 1 ; Waters, 1896, p. 290, pi. viii, figs. 6-9, 22. 

 Kenella biseriata Levinsen, 1909, p. 124; Harmer, 1926, p. 249. 



Station distribution. Not represented in the Discovery collections. 



Geographical distribution. Off Valparaiso, 3953 m. ; Malay Archipelago, 1509 m. (Busk). 



This species shows marked resemblances to members of the Farciminariidae and I 

 have therefore included the genus Kenella, of which K. biseriata is the genotype, in that 

 family. 



The curious lateral tubes described by Waters are the hydrothecae of a hydroid. 

 Capt. A. K. Totton tells me that it is a species of Reticularia, probably R. serpens. 



KEY TO THE GENERA OF BICELLARIELLIDAE DISCUSSED HERE 



Definitions of these genera (except Klugella and Erymophora genn.n.) are given by 

 Harmer (1926). 



1. Zoarium branching biserial or pluriserial 2 



Zoarium uniserial and branching, or laminate and not branching 9 



2. Colony flustrine with short marginal kenozooecia Klugella 



Colony cellularine without marginal kenozooecia ... ... ... ... ... ... 3 



3. Colony stalked 4 



Colony unstalked except in so far as rootlets surrounding proximal zooecia form a cable ... 5 



4. Stalk a cylindrical membranous peduncle with rootlets at tip, axillary zooecium (E) at 



bifurcation passing into branch of opposite side from that on which it originates 



Kinetoskias 

 Stalk composed of a series of kenozooecia, axillary zooecium (E) at bifurcation passing into 



branch of side on which it originates ... ... ... Caulibugula 



5. Zoarium biserial. Zooecia divided into two or three sections by folds, 1 turbinate with 



relatively short opesia ... ... ... ... ... ... ... ... ... 6 



Zoarium biserial or pluriserial. Zooecia not divided into sections, not turbinate. Opesia 



relatively long... ... ... ... ... ... ... ... ... ... ... 7 



1 These folds or nicks in the walls of the zooecia are sometimes called joints, but are quite distinct not 

 only from the highly developed joints of many of the Scrupocellariidae but also from the flexible joint-like 

 zones developed in a few of the Bicellariellidae, e.g. Bagula mollis Harmer (1926, p. 445). 



