538 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
powerful cardelles borne by the zooecial orifice. The frontal is a tremocvst. 23-24 
tentacles. 
Genotype. — Watersipora ( Lepralia ) cucullata Busk, 1853, variety labiosa Cal- 
vet, 1903. 
Range— Helvetian — Recent. 
The genotype is quite variable; the published figures resemble it but little 
because of the very irregular development of the two labial appendages of the 
aperture. In 1895 Neviani, ignoring the operculum, created for it a subgenus of 
G '35 
Fig. 158. Genus Watersipora Neviani, 1S95. 
A-I. Watersipora cucullata. Busk, 1853. A. Zooecium, X 50. B. Section of aperture with (cs) 
compensatrix, (7c) knob of operculum, (op) operculum open, (sli) frontal walls of zooecium, 
( t ) tentacles, (ts) tentacular sheath; X 85. C. Aperture with operculum nearly closed; 
(d) diaphragm, X S5. D. Transverse section of a zooecium near the distal end, showing the 
larva near the base of the zooecium, X 85. E. Operculum membraneous or somewhat chitineous, 
X 85. F. Commencement of glands growing on the operculum, X 250. (A-F after Waters, 
1909.) G. Zooecia of var. labiosa Calvet, 1903, X 35. H. Operculum of var. labiosa, X 90. 
I. Apertura of var. labiosa, X 90. (G-I after Calvet, 1903.) 
Smittia under the name of Watersipora. The great difference of the operculum 
by its rigor may justify the existence of a new genus, although the function remains 
identical. Moreover, in order to preserve the genus, it will be necessary to complete 
the description by further studies. 
WATERSIPORA (?) ERECTA, new species. 
Plate 69, fig. 15. 
Description. — The zoarium is free, erect , with two lamellae, back to back. The 
zooecia are elongated, little distinct; the frontal is smooth and little convex. The 
