A HISTORY OF SUSSEX 



SERTULARIIDJE 



31. Sertularella polyzonias, Linnaeus. 



A little, straggling species with stem and 

 branches of the same thickness throughout. 

 The calycles are somewhat oval and 

 arranged alternately on either side of the 

 axis into which they appear to be sunk. 

 The capsules are large and wrinkled. Often 

 found growing upon annelid tubes, flustra, 

 etc. Common in the trawl. Hastings. 



. 32. Sertularella gayi, Lamouroux. 



This species resembles in type S. poly- 

 zenias, but it is larger and of stouter build. 

 The stem is compound with calycles 

 alternate, short, stout and turned well out- 

 ward, and having four slight denticles to the 

 margin. The polypary is brown, the 

 margins of the calycles appearing some- 

 what lighter. Not uncommon in the 

 trawl. Hastings. 



33. Sertularella rugosa, Linnaeus. 



A small species often over-running flustra, 

 and throwing up short branches with 

 clusters of alternate wrinkled and oval 

 calycles. The capsules resemble the caly- 

 cles, but are much larger and contracted at 

 the base. Common. Hastings. 



, 34. Sertularella tenella, Alder. 



Hastings specimens appear to link together 

 as nearly as possible Alder's species tenella 

 and Hincks' species fusiformis. The 

 branches are about inch in height, arising 

 from the stem creeping over flustra. Caly- 

 cles smooth, intermediate in slenderness, 

 aperture with four denticles. The stem is 

 bent at a right angle immediately above each 

 calycle in a strongly zigzag manner. 

 Capsules large, ringed and with four 

 denticles. These points agree therefore 

 with tenella, except in the calycles being 

 smooth, not quite so slender, and in the 

 capsules being toothed, in which respects 

 the specimens resemble fusiformis. Hast- 

 ings. 



35. Dipbasia rosacea, Linnaeus. 



A very delicate and graceful species, the 

 laterally branched stems being flexible and 

 plume-like. The calycles are tubular, bi- 

 lateral, opposite, and bent straight outwards. 

 The female capsule is thrown into vertical 

 folds producing at the top a crown of spines 

 of which two, one on either side, project, 

 the others being curved over the centre. 

 Habitat, upon other zoophyte stems, sponges, 

 etc., from moderately deep water. Not 

 uncommon. Hastings. 



36. Dipbasia attenuata, Hincks. 



A species very like rosacea and difficult 

 to determine in the absence of the capsules, 

 which are certainly the best specific guide. 

 In this species the height of the stem joint 

 above the offshoot of the calycles below is 

 not so great as in rosacea, and the stem 

 between each pair of calycles is not so 

 attenuated. The calycles are also a trifle 

 longer and narrower. The male capsule 

 has a crown of spines directed horizontally 

 outwards, and one central and vertical 

 spine. Very common from the coralline 

 zone, and from moderately deep water. 

 Hastings. 



37.? Diphasia fallax, Johnston. 



The species is recorded with a query in 

 the Natural History of Hastings before 

 quoted. Although specimens are not at 

 hand, the record appears well founded. 

 Hastings. 



38. Sertularia pumila, Linnaeus. 



This hydroid covers densely the bladder- 

 wrack at low tide. The stem is only 

 about inch in height, and little branched. 

 The calycles are tubular, short, bent out- 

 wards and arranged in pairs, oppositely. 

 Capsules ovate. Very common. Hastings. 



39. Sertularia gracilis, Hassall. 



Of very similar growth to the last species 

 but smaller, denser, and altogether more 

 refined. Erect stems, not observed to 

 branch. The calycle margin is thrown into 

 two sharp points. Capsules ovate. This 

 species over-runs other hydroid stems. Not 

 very common. Hastings. 



40. Sertularia opercu/ata, Linnasus. 



This is a rich and luxuriant species and 

 has been termed 'seahair.' It affects 

 mussel shells and Laminarian stems. The 

 stems are long, fine, wavy, branching and 

 of equal thickness throughout. The colour 

 might be almost called a dull golden. The 

 calycles are arranged in pairs, oppositely, 

 and the margins of the apertures are thrown 

 into sharp points. Capsules balloon-shaped. 

 Occasionally colonies of this zoophyte might 

 almost be said to rival in the number of its 

 members the population of London. Very 

 common from moderate to deep water. 

 Hastings. 



41. Sertularia filicula, Ellis and Solander.* 

 Hastings. 



42. Sertularia abietina, Linnaeus. 



The erect stems are about 6 inches in 



80 



