66 BRITISH HYDHOID ZOOPHYTES. 



Halecium Beanii, Johnston. 



1 specimen dry. 



SPECIMEN Halecium Beanii may be known 

 34. from the last species by its very 

 delicate character, and instead of the straight, 

 rigid appearance, the tender branches are 

 rather zig-zag, giving off the shoots at the 

 angles. The " select " polypites are fully 

 developed, as in H. kalecinum, but the region 

 of the capsule where the eggs are located, 

 protrudes beyond the mouth of the capsule. 

 This, however, is not so in the other species. 



Family SERTULARIID^. 



Sertularella polyzonias, Linnaeus. 



3 dry specimens, and 1 specimen in box. 



SPECIMENS This family exemplifies 



35, 36, 37, 38. those hydroids in which 

 the receptacles are unstalked and arranged 

 on opposite sides of the axis. This is a lowly 

 and straggling form, the stem not being 

 appreciably stronger or thicker than the 

 branches. It overruns many objects, especi- 

 ally Flustra (a Polyzoon). The receptacles 



