19 
v ' ^eir upper part is remarkably furrowed and surrounded 
h" , nt, . m ® roils spines “ like a coronet.” All the vesicles are 
f 1 a i*ke ornamented by the spines, but the spines are always 
ta es m, sometimes large and at others small. Ellis appears 
o ^ink that the coronated state of the vesicles, depends on 
c e e Xpulsion of the gemmules ; but this is not always the 
a s °- In a specimen before me the gemmules, though ripe 
„ e n °t yet excluded, and the spines not only surround the 
jPperedge of the vesicle, but are scattered over one third of 
tjj f: u pper surface. Johnston says, “ Pallas asserts that 
a e comparison, as well as the figures of them in Ellis’ work 
Jjj 0 inaccurate, a criticism the truth of which Ellis denies in 
o v ! subsequent volume on Zoophytes many of those 
of ar i e » t ' lat * l‘ ave exam '“ c d are unlike any representation 
II mem I have yet seen, while others closely resemble the 
M) res of Ellis and Johnston. 
OAK CORALLINE. S. Pumila. Cells opposite, 
a Pproximated, shortly tubular, the top everted with an 
°ulique somewhat mucronated aperture ; vesicles ovate. 
ft 
| 0 jl° ra llina pumila repens, minus ramosa. Muscus coral- 
3 - lc * pumilus, denticellis bijugis, Raii Synop., vol. 1, p, 
c ’ Uo. 19. Corallina pumila erecta, ramosior. Muscus 
a "°ides pumilus ramosus, Raii Synop., vol. 1, p. 37, 
SiiJ 0 * p 1 - 2 > fi s- }■ ( not good). Sea Oak Coralline, 
an . ls ’ Cor., p. 9, pi. 5, fig. a A. Sertularia pumila, Ellis 
^ Colander’s Zoopb., p. 40, no. 48. Turton’s Lin., vol. 
}q P- 876. Stewart’s Eiem., vol. 2, p. 441. Templeton in 
P. to Nat v °k p.468. Johnston’s Brit. Zooph., 
to .. ' " 
P 1 - 9 > fig s - 3 and 4. Dynamena pumila, Latuou- 
* Cor. Flos., p. 170. Fleming’s Brit. An., p. 544, 
About low water mark on the shelving sides of 
toei. 
* > common the whole length of the south coast. 
V 
e *y common on the shelving sides of rocks and on fuci, 
s ee ® c * a fiy Fucus serratus, near low water mark. It 
t hoi s to prefer those rocks which have a southern aspect, 
5 ble i fi° es not confine itself exclusively to the south 
0v er ’. >ut seeks for shelter in the crevices and beneath the 
s itu lan S>ng weed wherever it can be found, on rocks so 
5a It is of a darkish brown colour, rarely exceeding 
in., , ,n height, sparingly branched and rooted by creep- 
i'fV i la . r fibres, from which new poljpidoms rise at 
a Ppr - r intervals. The cells are opposite, and closely 
° xima ted; they are bulged at the base, their apertures 
fi'otft l ^ t contracted and everted; and each pair is separated 
^ith * le other by a joint. The vesicles are pear-shaped, 
