VoL, 2] Robertson.—Non-Incrusting Bryozoa. 251 
colony (7.); those arising in the dorso-lateral chambers may 
assist In anchoring the colony when they occur on zoccia in the 
lower part of the colony; usually, however, they turn upward, 
and twining about the other portions of the colony, function as 
tendrils (uw. 7.). 
Waters (’96) calls attention to the diagnostic importance of 
the root fibres, their position being fairly constant so that it may 
be used as a specific character. Of the Menipeas of this region, 
M. ternata and M. gracilis have root chambers in identical posi- 
tions and root fibers performing identical functions. The other 
three species differ from these two and from each other in the 
number and shape of the root chambers and in the function of 
the root fibers arising from them. 
KEY TO THE SPECIES OF MENIPHA. 
ibe Zomcia commonly: threes am ameinGermoc eyes see eee eee 2 
Te, PACs ON, waneet ay? Tira Ewa, TAKEN) eee ee Serer seee ne eeeeroreeees M. erecta 
Pee SPUMCS a tWiOmOlM GNC Cg arate ee er seer ee cect 2 ee ee een asevacan te eoee 3 
PA STOMMES MIO ME mt ele tai OW O Ty GEC Cee sees ree oe eee ees nee 5 
3. Scutum half way down on the margin of the aperture —__................. a 
3. Scutum two-thirds of the way down on the margin of the aperture...... 6 
AS CUE TITS 10 eas PO = ly eeee ee eae ee score ees eee M. ternata 
A Seutumelaraesy tabelabe 22s: anne OMA kes ee M. gracilis 
Oe MBS CUE ULI STAM @ eee ne crete 2k se ee Ne PEL Aes ani oned Meda USSF 6 
DOSS G Ul UT aa CLUaVAliGl © Cl lapeseee ace een eee ee een et eee cr eee ee ee if 
6. Scutum half way down on the margin of the aperture_....M. pribilofi 
6. Scutum two-thirds of the way down on the margin of the aperture...... 
AS Pirie eae ne ae RR cena Ee Se BR er aes Na Se eoe ke M. occidentalis 
7. Seutum two-thirds of the way down on the margin of the aperture...... 
BEI oe _--.------...---... MM. occidentalis subspecies catalinensis 
5. Menipea ternata (Ellis and Solander) Busk. 
TEI We akegss WU, dG), eS als) WOR ABI NOLS sites, alyie 
Cellaria ternata Ell. and Sol., 1786, p. 30. 
Cellularia ternata, Johnston, 1847, p. 335, Pl. LIX, figs. 1, 2. 
Cellarina gracilis, Van Beneden, 1849, p. 67, Pl. X, figs. 1, 2. 
Menipea ternata, Busk, 1852, pt. I, p. 21, Pl. XX, figs. 3-5. 
Cellularia ternata, Smitt, 1867, p. 282, Pl. XVI, figs. 10-26. 
Menipea ternata, Hincks, 1880, p. 26, Pl. VI, figs. 1-4. 
Zoarium consisting of loosely spreading, straggling branches, 
‘or sometimes of rather large dense masses, frequently 30 
