BEANIA. 95 



B. Miirrayana seems to be in great measure a northern 

 form, and to be especially at home in the extreme north. 

 The YSiv . fruticosa prevails in the Arctic seas. The iden- 

 tification of this species with the Sertularia spiralis of 

 Olivi is more than doubtful, and is so regarded by Heller, 

 who has not himself obtained it in the Adriatic. 



Genus BEANIA, Johnston. 



Der. Named after William Bean, the well-known Scarborough naturalist. 



Generic Character. — Zoarium subcorneous or calca- 

 reous, erect or decumbent. Zocecia sessile, erect, scattered, 

 united one to the other by a slender tube, originating from 

 the dorsal surface or from the side near the base ; aper- 

 ture occupijing the entire front, the margin furnished ivith 

 holloiv spinous p)T'ocesses arching over the opening ; mouth 

 terminal. Ocecia and Avicularia wanting. 



The links which bind the present genus to the Bicellarian 

 group have already been referred to. It has also affini- 

 ties, though probably more remote, with Aetea. The 

 tubular connexions between the cells may be regarded 

 as of the nature of pedicels; and we may therefore 

 compare such a form as B. mirabilis with A. truncata 

 (see Plate II. fig. 3), to which in several points it bears a 

 curious resemblance. 



The intercellular tubes are in no sense the equivalent 

 of a creeping fibre ; nor are they in any way concerned in 

 attaching the zoarium to its place. This is effected by a 

 special arrangement. From each cell (in B. mirabilis) a 

 membranaceous tubular process is given off from a defi- 

 nite point on the dorsal surface near the base (woodcut, 

 fio-, 4fl), varying in length according to circumstances, 

 and terminating in a small disk, furnished with a number 



