Polyzoa oftJie Adriatic. 309 



Family VesiculariidsB. 



BowERBANKiA, Farre. 



Bowerhankia inibricata^ Adams, form densa. 



Abundant, growing in dense subglobular tufts. 

 Range. Britain ; White Sea ; Caspian Sea ; HoscofF. 



Boioerhanhia caudata^ Hincks. 

 Range. Ilfracombe. 



BowerbanMa hiserialis^ n. sp. (PI. IX. figs. 6.) 



Erect, stems * composed of stout, cylindrical, transparent 

 internodes of great length ; at each joint two opposite branches 

 given off, the terminal internodes tapering off to a blunt point. 

 Zooecia oblong, of moderate size, and about equal width 

 throughout, subtruncate above and roundedbelow, sessile, trans- 

 parent, arranged in two distinct series, which originate in a 

 central cell or group of cells near the base of an internode, 

 from which they diverge and run along opposite sides of the 

 stem in a double row, the intermediate portion of the stem 

 destitute of cells. 



Height of specimen about an inch and a quarter. 



This is an interesting form, and is distinguished from Q.yQxj 

 other known Vesicularian by the peculiar arrangement of the 

 zooecia. Towards the base of the internode a group of cells 

 is developed, and from this as a starting-point proceed two 

 divergent series of cells, which traverse the opposite sides of 

 the cylinder, to the summit of the internode. Each series is 

 composed of two lines of cells (at least) ^ and after reaching 

 the side of the cylinder they run parallel to one another 

 (PI. IX. fig. 6), a wide space, destitute of zooecia, lying 

 iDctween them. The cell is very much smaller than that of 

 B. imhricata, and altogether of more delicate make. The 

 stem is comparatively thick and the internodes of great length, 

 so that the branching appears scanty. 



Bowerhankia pustulosa, Ellis & Sol. 



? Valkeria Vidovici, Heller. 



The true B. pustulosa occurs in the Adriatic, and I am 

 inclined to think that Heller's species must be identical with 

 it. The only difference between them, judging from his 



* No doubt the erect shoots are developed on a creeping stolon ; but 

 in the only specimen whir h I have examined it was wanting. 



