2 Proceedings of the Royal Physical Society. 
on each side,! but makes no reference to it in the text. Hincks 
both figures and describes “one nematophore on each side of the calycles, 
pedunculated,’ in his monograph,? and in a later paper.? Kirchenpauer 4 
and Nutting® are content to reproduce Hincks’s figures and abide by his 
description. 
Apart from these, Plumularia catharina has been recorded scores of 
times, and, except in three cases, so far as I am aware, the recorder has no 
observation to add, or holds to the orthodox description of the arrangement 
of the lateral sarcothece. 
The three exceptions are as follows:—In 1889, Segerstedt® figured 
specimens from the west coast of Sweden as bearing two lateral 
nematophores on each side, and these he distinctly describes, saying, “to 
Hincks’s description of this species, I have to add that there occur on the 
sides of each calycle, inside the two pedunculated accessory calycles 
[sarcothecee] mentioned in descriptions, also a pair of smaller, sessile 
structures of a similar nature.” In 1909 Dr Jaderholm, in his valuable 
monograph on “Northern and Arctic Vertebrates in the Swedish State 
Museum,’ gives a beautiful figure of Plumularia catharina in which two 
lateral sarcothecze are shown on each side of the hydrotheca, but no 
reference is made to this feature in the text. Lastly, Dr Billard, in the 
note already mentioned, has drawn attention to the discrepancy in 
descriptions, in the hope that the question may be settled by direct 
examination of the type specimen. 
Johnston first described the species in 1833, and although in his 
account he does not single out a specimen as typical, and indeed does not 
even mention the locality from which the figured example was obtained, yet 
it is clear from his remark—*“Specimens are not uncommon in Berwick 
Bay ; and I have seen the same from the Firth of Forth ”—that he would 
have regarded the former locality as one characterised by the presence of 
typical examples of the species. In 1847, the year in which the second 
1 Landsborough, A History of British Zoophytes or Corallines, London, 1852, pl. ix. fig. 27. 
2 Hincks, A History of British Hydroid Zoophytes, London, 1868, p. 299, pl. 66 
fig. 2, wand b. 
3 Hincks, Ann. Mag. Nat. Hist., series 4, vol. x., pl. xxi. figs. 4 and 5, 
4 Kirchenpauer, Abh. a.d. Gebicte d. Naturwiss., Hamburg, 1876, Taf. i., fig. 12. 
5 Nutting, American Hydroids—pt. i., “ Plumularide”—Washington, 1900, pl. ii. 
figs. 1 and 2, 
6 Segerstedt, Bihang. Kungl. Vet.-Ak. Handl., Stockholm, Bd. xiv., 1889, Afd. iv., 
No. 4, p. 21, fig. 2. 
7 Jiiderholm, Kungl. Vet.-Ak. Handl., Stockholm, Bd. 45, No. 1, 1909, pp. 30, 37, 107, 
pl. xii. fig. 7. 
