494 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Genus UMBONULA Hincks, 1880. 
1880. Umbonula Hincks, British Marine Polyzoa, p. 316. 
There is neither lyrula nor cardelles. The apertura is suborbicular. The ovi- 
cell is hyperstomial and opens largely above the apertura. The frontal is a pleuro- 
cvst with costules surrounded by areolae. A prominent umbo immediately below 
the mouth supporting an avieularium. 20-30 tentacles. 
Fig. 137. — Genus Umbonula Hincks, 1880. 
A-D. Umbonula verrucosa Esper. 1791. A. Ordinary zooecia. X 25. B. Ovicelled zooecia. 
X 36. (A, B after Hincks, 1880.) C. Avic-ularian mandible, X 85. (After Waters, 1885.) 
D. Young zooecium. The frontal shield is represented by a crescentic calcareous film, already- 
divided by radiating buttresses on the upper surface into distinct areolae (ar) in the floor of 
each of which is a pore (p). The distal wings (/, sh, d) of the shield are distinctly indicated. 
The parietal muscles ( p . m.) are seen through the calcareous film, pvm, parieto-vaginal muscles. 
(After Harmer, 1902.) vest, vestibulum ; op. gl., opercular glands; occl, ocelusor muscles of the 
operculum; t. s., tentacular sheath; b , poly T pide bud. E. Operculum, X 40. F. Avicularian 
mandible, X 260. (E, F after Calvet, 1903.) 
Genotype. — Umbonula ( Cellepora ) vengicosa Esper, 1791. 
Range. — Lutetian-Recent. 
The ovicell is analogous to that in Rhamphostomella Lorenz, 1896, but there is 
no lyrula. It has not a deep peristomie as in PoreVa and Smittina , into which the 
ovicell opens. The place of this genus in this family is doubtful. Harmer in 1902 
considered it as the type of a special family. 
UMBONULA (?) MISER, new species. 
Plate 94, fig. 19. 
Description. — The zoarium is unilamellar and creeps on algae. The zooecia 
are elongated, distinct, quite irregular, little symmetrical, of an ugly aspect; the 
frontal is convex, formed of a smooth pleurocyst surrounded by small triangular 
areolae. The peristome is thick, irregular, hardly salient. The ovicell is small, 
