242 University of California Publications. [ ZooLocy 
PHoyLtuM Mo.uuuscoirpa Milne-Edwards. 
Class BRYOZOA Ehrenberg. 
Sub-Class Ectoprocta Nitsche. 
Colonial bryozoa with anal orifice outside the lophophore; 
a well developed introvert, and a spacious eclome. 
Order GYMNOLASMATA Allman. 
Polypide destitute of an epistome; lophophore circular. 
Sub-Order I. CuHmostomata Busk. 
Gymnolemata with caleareous or chitinous zocecia whose 
orifice is closed by a movable chitinous lip or ‘‘operculum’’; 
ova usually matured in globular omcia situated above the orifice 
of some of the zowcia; vibracula or avicularia, or both, fre- 
quently present. 
Of the fifteen or more families included by Hincks in the 
Chilostomata, all but the first seven, viz., the Membraniporide, 
Microporide, Cribrilinide, Microporellide, Porinida, Myrio- 
zoidw, Escharide, are omitted here. These are incrusting, or 
if erect, are for the most part non-flexible in habit of growth. 
Below is given a key to the first seven families of the Chilostomes 
which are, for the most part, erect and flexible in habit of 
growth. 
KEY TO THE FIRST SEVEN FAMILIES OF THE CHILOSTOMATA. 
1, Golemy \eree pings (£2 a. Faye bc eee ee ee ee ee ee oe 2 
i Colonyaerect: =e er er or Pera ees eee! Se 3 
2. Colony sending up erect branches from a pane just below the 
2M O =) al AF < eee RoR ES ee SO oe a ee ent Eucratiide 
2. Colony not sending up erect branches ee Be ne se eee eee Aeteidz 
3. Colony articulated: 3 j. 6 ea ee er ees 4 
3s. Colony mot ventiieulate diye: 05 ee ie oe es ene ee ae eee 5 
4. Zoecia multiserial, arranged round an imaginary axis....... Cellariide 
A$ ZO CCL A OVS CY NRL ace eee eee es ee ee Cellulariide 
Shey Aclenoh Mirna dsweeegeoh lovee stor lop Kc eee: ee ee 6 
5.) AOWGIa NO’ Wack GO: eC kre oe eee eae 7 
6.: Zoweia, with: aviculariay 3-23 ee eee Notamiide 
6:5 ZO C2 Glah swat hob you vil Gel ret ye eee Eucratiide 
7. Zoecia biserial, avicularia pedunculated —.............22...... Bicellariide 
7. Zowcia multiserial, avicularia sessile —........2.2 Flustride 
