208 
THE VOYAGE OF H.M.S. CHALLENGER. 
2. Lunularia, Lamouroux {nomen mutatum). 
Lunulites, Lamouroux, 1821, Brit. Mus. Cat., part i. p. 100; (pars) Lamarck, Defrance, &c. 
Character . — Zooecia disposed in series, radiating from the centre and bifurcating as 
they advance towards the border ; the vibracularia lying in linear series, alternating 
with those of the zooecia. The chitinous vibraculum usually bifid or trifid at the 
extremity. 
In order to avoid the confusion attending the name Lunulites, which has usually 
been understood, by the older writers at any rate, more as a family than as a generic 
appellation, and is moreover more suitable, in conformity with general usage, for fossil 
forms, I propose to change it for Lunularia, the termination of which is also more in 
accordance with the other genera in the same family. 
(1) Lunularia capulus, Busk (PL XIV. fig. 7). 
Lunulites capulus, Bk., Brit. Mus. Cat., vol. i., p. 100, pi. cxii., and Voy. of Rattles., I., pi. i. figs. 13, 14. 
Character . — Zoarium rounded, conical, much raised ; area semilunar or arched above, 
and straight below with a small bifid denticle within the margin (sometimes not seen) ; 
margin granular ; vibracula trifid at the extremity. Dorsal surface grooved ; ridges 
punctured with a single row of pores. 
Habitat . — Station 161, off Port Philip, 33 fathoms, sand. 
[Off Cape Capricorn, Yoy. of Rattles.] 
