VoL. 2] Robertson.—Non-Incrusting Bryozoa. 243 
Aeteidae Hincks. 
Zoarium composed of creeping branches more or less ad- 
herent to the substratum, often growing in free tufts adherent 
only part of their length. Zowcia uniserial, arising from each 
other in a tubular prolongation of greater or less length. 
Aperture terminal, orifice at its summit. 
The definitions of family Aeteide, of genus Aetea, and of 
species Aetea anguina are here much changed from those given 
by Hincks, whose diagnoses are based upon the erroneous notion 
which that observer entertained concerning the true nature of 
the Aetean zoecium. The adherent portion of the zocecium he © 
regarded as a stolon which together with the circle of sete in 
which the tentacle-sheath terminates (Smitt, 67) seemed, he 
thought, to relate Aetea to the Ctenostomes, and to place it in 
the position of a form transitional between these and the Chilos- 
tomes. Whatever may be the relationship between these sub- 
orders, Aetea cannot be said to reveal it, since as will be shown 
in the discussion under the species A. anguina, the adherent 
99 
‘*stolonie portion’’ so-called, is not a stolon, but an important 
part of the zocecium. 
Aetea Lamouroux. 
Aetea Lamouroux, 1812. 
Anguinaria, Johnston, 1847. 
Aetea, Hincks, 1880. 
Aetea, Jullien, 1888. 
Zoarium adherent to the substratum. Each zow@ciuwm par- 
tially adherent, partially erect, the erect portion carrying at its 
distal extremity the membranous aperture with its operculum. 
KEY TO THE SPECIES OF AETEA. 
1. Tubular portion of zoecium ringed, upper third spatulate, bent........ 
SEN 5 sos Sa eas Os SOT pa Me eR RD SB EE, ERS A. anguina 
1. Tubular portion of zowcium not ringed, upper extremity not bent, 
Dovite exci cl Cla iY, UlTy Cal ie eee cere eee eeee eC ILE Leann es A. truncata 
