2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Class BRYOZOA Ehrenberg 



Order CHEILOSTOMATA Busk 



Suborder Anasca Levinsen 



Division MALACOSTEGA Levinsen, 1909 



Family MEMBRANIPORIDAE Busk, 1854 



ACANTHODESIA Canu and Bassler, 1920 



ACANTHODESIA QUADRILATERA, n. sp. 



Plate I, fig. 10 



Description. — The zoarium is subcylindrical, consisting' of six rows 

 of zooecia arranged around a central line. The zooecia are distinct, 

 adjacent to each other through their mural rims, elongated, rectangu- 

 lar. The mural rim is thin, rounded, granulated, common to the 

 adjacent zooecia; the cryptocyst is flat, smooth, shorter than the 

 opesium. The opesium is anterior, elongated, elliptical, regular, bor- 

 dered by a salient cushion, ornamented by small, very short spicules. 



Measurements. — ■ 



„ . {ho = 0.2-7 mm ^ . rLrr = 0.48 mm 

 OpesiumJ Zooecmm^ , 



I /0=:O.I2 mm I lz = o.2^ mm 



Occurrence. — Muddy Creek (Balcombian), and Orbost, Gippsland 



(Janjukian), Victoria. 



Holotype.—\].S.l<^.'M. nos. 85582, 85583. 



ACANTHODESIA REGULARIS, n. sp. 



Plate I, fig. 3 



Description. — Zoarium of slightly flattened, subcylindrical branches 

 of 6 to 10 rows of zooecia arranged around a central line. Zooecia 

 rectangular with granulated mural rim and a cryptocyst about three 

 fifths as long as the opesium, which is anterior and elongated. 



Measurements. — 



, (ho = 0-2)0 mm . fL^r^ 0.60-0.65 '""^ 



Opesmm-^ , ^ ,0 ^ ^^ Zooecia-^ , 



^ 1/0 = 0.18-0.20 mm I te = 0.30-0.35 mm 



Occurrev.ce. — Janjukian beds at Anticline Creek, Dartmoor, 



Victoria. 



Cotypes.—V.S.^.U. no. 85581. 



