306 E. A. BRIGGS. 
PLUMULARIA SULCATA, Lamarck. 
(Plate XI, fig. 1.) 
Plumularia sulcata, Lamarck, Hist. nat. Anim, sans Vertébres, 
1816, p 128; id., Bale, Cat. Austr. Hydroid Zoophytes, 1884, 
p. 145; cd., Billard, Ann. Sci. Nat., Zool., (9), v, 1907, p. 321; 
id., Ritchie, Mem. Austr. Mus., tv, 16, 1911, p 852, pl. 
Ixxxiv, fig. 3, pl. Ixxxix, fig.5; id., Ritchie, Proce Phys. 
Soc. Edinburgh, x1x, 1, 1913, p. 6; zd., Bale, Biological 
Results “Endeavour,” 11, 4, 1914, p. 172, pl. xxxv, figs. 6, 7. 
Plumularia aglaophenoides, Bale, Cat. Austr. Hydroid Zoophytes, 
1884, p. 126, pl. x, fig. 6. 
Owing to the very imperfect nature of Lamarck’s original 
description of Plumularia sulcata, the species was not 
again identified until his type was recently examined and 
described in full by Billard. Meanwhile the first detailed 
description of this species was published by Bale, who 
described it as new in 1884, under the name of Plumularia 
aglaophenoides, but the examination of the type of P. sul- 
cata enabled Billard to recognise its identity with Bale’s 
species. Further details of the specific characters of the 
species have been added by Ritchie and also by Bale, the 
latter author describing the gonosome. Previous to the 
publication of Bale’s report on the “ Hndeavour’’ Hydroida, 
the gonosome had not been observed, and it is interesting 
to note the occurrence among the present specimens of a 
colony with gonangia. Bale’s description reads as follows : 
““Gonothece large, urceolate, slightly narrowed upward 
and again expanding to the summit, margin circular, oblique, 
not contracted nor thickened; a stout transverse ridge 
inside the front a little below the margin; alarge operculum 
the full width of the gonotheca, slightly convex in the 
middle, situated inside the margin and resting on the 
internal ridge in front; several large sarcothece (often five 
or six) surrounding the base.”’ 
