520 VESICULARIID.E. 



BOWERBANKIA IUBRICATA, Johnst. B. Z. ed. 2, 377, pi. Ixxii. figs. 5, 6: 

 Alder, Northumb. Cat. loc. cit. 67 (sep.) : W. Thompson, 

 N. H. Irel. iy. 466 : Hinclcs, Dev. Cat., Ann. N. H. ser. 3, 

 ix. 473 (59, sep.) : Jolict, Bryoz. d. cotes de France, 102. \c. 

 (Not B. imbricata, Gosse, Mar. Zool. ii. fig. 39.) 



BOWERBANKIA DBN8A, Forrt, PhiL Trans. 1837, 391, pis. xx. & xxi. : Johnst. 

 B. Z. ed. 1, 255: Van Ben. Reh. 29, pi. iv. fig. A (Mm. 

 Brux. x?iii.). 



Stem tubular, creeping (B. densa auctt.) or erect, and ir- 

 regularly branched (B. imbricata} *. Zooecia large, ovato- 

 cylindrical, transparent, broad and squarish at the top, 

 somewhat narrowed below, disposed in groups along the 

 creeping stolon, or in irregular clusters (sometimes 

 almost continuously) on the erect stems and branches. 



Polypide with 10 tentacles, furnished with a row of about 

 12 tactile setae on the back : gizzard large and power- 

 ful. 



Height of the erect form 1-3 inches. 



IN its erect form this species grows in " bushy, flaccid 

 tufts," much and irregularly branched, and attains a very 

 considerable size. The cells are arranged in large, dense 

 clusters along the stem, either on one aspect of it only, 

 or (not unfrequently) on all sides of it. Occasionally the 

 groups blend, and the zocacia range almost continuously 

 along the branches. The stem is stout and smooth, and 

 of a decided horn-colour. In its humbler form B. imbri- 

 cata spreads on the surface of Algae, stones, &c., the 

 cells being grouped at intervals on the creeping stolon. 

 The common Corallina is a favourite habitat ; and on 

 this it forms compact suborbicular tufts, which completely 

 surround the stem. 



* "Au printemps # * # on trouyc abondamment la forme densa de la 

 Bcwerbankia compose d'une quantity de loges drcsse'es sur la surface de 1'Algue 

 et presages 1'une centre 1'autre de maniere A ne former qu'im tapis. Plus 

 tard se d6tachent de ce groupe des stolons, puis des rarucaux libres qui 

 poussent des branches et, se garnissant de paquets de loges, reproduisent la 

 forme imbricata." JOLIBT, Bryozoaircs des cotes de France. 



