Sertularia. 
Z. HYDROIDA. 
125 
Polypidom from one to two inches in height, attached by a creep- 
ing tortuous tubular fibre, very slender and delicate, of a white or 
pale horn colour, pellucid, variously branched, the branches bifarious, 
alternate, patent, similar to the stem. Cells opposite, with a joint 
between each pair, rather long, tubular, the upper half suddenly di- 
vergent with an oblique entire aperture. Ellis compares the vesicles 
to a “ Lily or Pomegranate flower just opening,” but Pallas asserts 
that the comparisons, as well as the figures of them in Ellis’s work, 
are inaccurate, — a criticism the truth of which Ellis denies in his sub- 
sequent volume on zoophytes. They appear in fact to vary some- 
what according to their age, and also from the manner in which they 
have been dried. They are large and pear-shaped, subsessile, pucker- 
ed at the top where they are crowned with several spines ; 
Fig. 14. 
and though scattered over the polypidom, they appear to be produced 
from one side only, and are often arranged in close rows along the 
branches. — Our figure is the exact portrait of a beautiful specimen 
in the collection of Dr Coldstream ; and I have a similar one from Mr 
Bean, but in general the species is very small and sparingly branched. 
6. S. Pumila, cells opposite, approximated , shortly tubular , the 
top everted with an oblique somewhat mucronated aperture ; vesi- 
cles ovate . Doody.* 
Plate IX. Fig. 3, 4. 
* Doody, Samuel, an apothecary in London, contemporary with Ray, Peti- 
ver and Sloane, admitted F. R. S. in 1695. He was chosen superintendant and 
demonstrator of the garden at Chelsea, an office w r hich he held for some years 
before his death, which took place in 1706- Petiver characterises him as an “ in- 
defatigable botanist,” and “ memorable naturalist.” Jussieu speaks of him as 
“ inter Pharmacopoeos Londinenses sui temporis Coryphaeus.” Pulteney styles 
him, “ the Dillenius of his time ;”and Brown has crowned his praise by bestow- 
ing his name on a genus of New Holland plants. “ In memoriam dixi Samuelis 
Doody, Pharmacopoei Londinensis, qui primus fere in Anglia plantas cryptoga- 
