VoL. 2] Robertson.—Non-Incrusting Bryozoa. 247 
than at the point of union with the adherent portion; truncate, 
granular, no part of the zocecium annulated as is the erect 
portion of the zocecium of the preceding species. Oacia not 
known. 
No colonies of the branching form described by Hincks occur 
in our material, the simple form of Aetea truncata alone pre- 
vailing. The creeping portion of the zowcium is rather closely 
adherent to the substratum so that it is not easily removed. The 
polypide resembles that of Aetea anguina, being of simple struc- 
ture and when retracted is drawn almost completely into the 
ereeping part. 
This species was obtained in considerable quantity at La 
Jolla growing over the older stems of a kelp hold-fast. 
Eucratiidae Hincks. 
Zoarium forming slender, branching, phytoid tufts. Zowcia 
uniserial, or in two series placed back to back; expanding from 
the base upwards, with a terminal or subterminal and usually 
oblique aperture. Neither avicularian nor vibracular append- 
ages known. Ocacia globose. 
KEY TO GENERA AND SPECIES. 
IE MColomyaCRCe Pill Oyen ee i eee Eucratea chelata 
AEC OLOT AOE CI UN cna got eee tes ee ee dee ae an eee Gemellaria loricata 
Eucratea Lamouroux. 
Cellularia (part) Pallas, 1766. 
Cellaria (part), Ellis and Solander, 1786. 
Eucratea Lamouroux, 1812. 
Catenaria (part), d’Orbigny, 1850. 
Eucratea, Johnston, 1847. 
Scruparia, Busk, 1852. 
Eucratea, Hincks, 1880. 
Zoarium composed of creeping adherent branches and of 
erect free shoots. Both creeping and erect branches composed 
of zocecia arranged uniserially, the erect branches arising from 
the ventral wall of the zowcia. Zowcia prolonged into a tube 
of greater or less length. Aperture large. 
