124 
MEMOins OF THE QVKKN^LAFn MV&EVM, 
Holotijpe. — A shell with its base only exposed (%. 1) on slab F. 2026, in the 
Queensland Museum. Four other shells are on the same slab, all showing their bases. 
On another slab are remains of numerous individuals, mostly broken, including one 
poorly exposing the outer surface, and from this slab were obtained the two attached 
compartments (figs. 2a, b). 
Locality . — ]\lagnetic Island, North Queensland. 
Description . — Shell circidar, depressed, with eight compartments, the carino- 
lateral compartments narrower than the Icvteral. Basis membranous. Radii 
comparativ^ely narrow, toothed, the teeth representing the upper part of the ribs on 
the sutural edges of the compartments (fig. 3). Walls, even after allowing for the 
wearing down of the base by erosion, extremely thick. Largest shell with a rostro- 
carinal length of 20 mm. 
Comparison with other species. — 0. crassa is readily distinguished from 0. 
angidosa, which has the shell steeply conical and the surface extremely rugged, for the 
radiating ribs are irr-egular and stand out quite sharply with extremely deep 
intervening de})ressions. 
0. brnnnea agrees with O. crassa in the close-set radial ribs, but the ribs are 
finer and more regidar ; the main difference from 0. crassa, however, lies in the very 
thin walls. 
0. iniermedhis has a shell less flattened than in 0. brnnnea and O. crassa, but 
not so steep as in O. angulosa ; it has ribs like 0 . ang^dosa, although a little weaker, 
and the sutures have distinct teeth which are fewer and larger than in 0. angulosa, 
and much fewer than in O. crassa. The walls of the shell of 0. intermedins are not so 
thick as in. 0 . crassa. 
LITERATURE REFERRED TO. 
Darwin, C. R., 1854. A Monograph on the Sub-class Cirripedia with figures of all the Species. 
The Balanicltc, &c., viii., 084 pp., 80 plates. London : Ray Soc. 
Nilsson-Cantell, C. A., 1921. Cirripedeiv-Studien, Zur kenntnis der Biologie, Anatomie und 
Systematik dieser Gruppe. Zool. Bidmg Up'psala, VII., pp. ix, 75-394, plates i.-iii., 89 
text-figs. 
Nilsson-Cantell, C. A., 1926 (Feb.). Neue und wenig bekannte Cirripoden aus den Museen zu Stock- 
holm und zu Upsala. Ark. Zool., XVllI.u, Xo. 3, pp. 1-46, plate i., 15 text-figs. 
Nilsson-Cantell, C. A., 1930, Rcsultats Scientifiques dii Voyage aiix Indes Orientales Neerlandaises. 
Cirripedes. M(m. Mas. Boy, Hist. Hot. Belg., III., Fasc. iii., pp. 1-24, 7 text-figs. 
Sowerby, G. B., 1825 (July). On a New Genus of Cirripedes. Zool. Journ., IT., pt. 6, pp. 244-5, 
plate xii., (Suppi.). 
