250 University of California Publications. [ ZooLocy 
vibracula, or avicularia only, almost universally present, sessile. 
This is a well marked group all of whose members have a 
strong family resemblance. The walls of the zoccia are strongly 
calcified, being generally variously adorned with spines and 
sessile avicularia, and many with waving vibracula. In all the 
embryos mature in globose, hood-like owcia. This family is 
well represented in our fauna, there being at least six species of 
Menipea, four of which are new; and three of Scrupocellaria, all 
of which are peculiar to this region. Caberea is represented by 
but one species, the northern C. ellisi. 
KEY TO THE GENERA OF CELLARIID. 
Zocecia three or more in an internode without vibracula........ Menipea 
Zowcia many in an internode, vibracula present ....................------..-------- 
Vibracular chamber not covering dorsal surface of zoccium .......... ... 
ce he A To ac St a ec eg Re ee as CR Scrupocellaria 
Vibracular chamber directed obliquely and covering the dorsal sur- 
face of the zocecium ................. Baa Re bree «EES ed re Caberea 
De 
bo 
bo 
Menipea Lamouroux. 
Pl. V, fig. 16. 
Menipea Lamouroux, 1816. 
Cellularia, Johnston, 1847. 
Cellarina, Van Beneden, 1849. 
Emma, Busk, 1852. 
Menipea, Busk, 1852. 
Cellularia, Smitt, 1867. 
Menipea, Hincks, 1880. 
Zoacia oblong, widest above, attenuated below, often elon- 
gated downward; lateral avicularia generally present, sometimes 
wanting; frontal avicularia generally present on the zocecium 
at the bifureation of a branch. No vibracula. Ow@cia present; 
large, globose. Root fibers characteristically located, being found 
in two positions: first, on the front, or on the lateral wall of a 
zocecium just below or to one side of the aperture (fig. 16, 7. d. 
and r.) ; second, in a definite dorso-lateral chamber situated just 
above the lateral avicularium (7. ch. and u. r.). In certain mem- 
bers of this genus, different functions are performed by these 
differently located fibers. Those found to one side, or below the 
aperture invariably turn downward and serve to anchor the 
