706 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
The peristomes are more salient laterally than in Grisia homesi Reuss, 1847, 
with which it is scarcely possible to confuse it. 
Occurrence. — Middle Jacksonian: Near Lenuds Ferry, South Carolina (rare). 
Geological distribution. — Lutetian of Paris (Canu) ; Priabonian of the Vicen- 
tin (Reuss) ; Rupelian ( = Stampian) of Germany (Reuss) and of Gaas (Reuss) ; 
Burdigalian of Gard (Canu) ; Helvetian of Italy (Seguenza) and of Gard (Canu) ; 
Tortonian of Austria Hungary (Reuss) and of Italy (Seguenza) ; Zanclean of 
Italy (Seguenza) ; Astian of Italy (Seguenza). 
Neviani in 1900 affirmed that this species lived in the Mediterranean. This is 
possible, but we have not yet sufficient proof of this fact. 
Plesiotypes. — Cat. No. 65337, U.S.N.M. 
CRISIA CRIBRARIA Stimpson, 1853. 
Plate 141, figs. 9-11. 
1853. Grisia cribraria Stimpson, Synopses of the marine Invertebrata of Grand Manan 
or the region about the mouth of the Bay of Fundy, New Brunswick, Smithsonian 
Contributions to Knowledge, vol. 6, no. 5, p. 18. 
1910. Grisia cribraria Osbtjrn, The Bryozoa of Woods Hole Region, Bulletin of the 
Bureau of Fisheries, vol. 30, p. 215, pi. IS, fig. 7. 
( Distance between the apertures 0.24 mm. 
Measurements. — Width of zooecia, including peristome 0.08 mm. 
I Zoarial width 0.28 mm. 
In the separation of the apertures, which is less than the zoarial width, this 
species is close to Grisia homesi Reuss, 1847. It differs from it in its micrometric 
dimensions, and especially in a larger number of tubes on the segments (27 in 
place of 18). 
We have based our determination on Osburn’s figure. 
The ovicell is pyriform, salient; its oeciopore is terminal and placed against 
the zoarial wall ; it has no salient oeciostome. 
Occurrence. — Lower Jacksonian (Moodys marl): Jackson, Mississippi (rare). 
Habitat — Coasts of the United States (28 meters) at Crab-Ledge on Cape 
Cod, and of Canada. 
Plesiotypes. — Cat. No. 65339, U.S.N.M. 
CRISIA LOWEI, new species. 
Plate 141 fig. 8. 
Description. — The segments are short and are formed of 14 to 15 lateral and 
alternate tubes. The peristomes are orbicular, somewhat salient laterally to one- 
half of their diameter; their separation is less than the zoarial width. The ovicell 
is pyriform. 
Measurements . — 
Distance between apertures ; 0.20-0.24 mm. 
Diameter of the zooecia and peristome 0.06-0.07 mm. 
Zoarial diameter 0.28 mm. 
Number of tubes to a segment 14-15 
