26 BITLLETIN 125, UNITED STATES NATIONAL, MUSEUM. 



MEMBRANIPOKINA VINCULARINA, new species. 



Plate 9, figs. 8-10. 



Description. — The zoarium is free, vincular, formed of two lamellae back to 



back, composed of four to eight longitudinal rows of zooecia. The zooecia are 



elliptical, distinct, separated by a deep furrow; the mural rim is wide, rounded, 



tuberose somewhat wider in the proximal portion; the opesium is regular, elongated, 



elliptical. 



, „ . f /to = 0.24-0.32 mm. „ . f is = 0.40-0.50 mm. 

 Measurements. — Opesia \ -, n ^a n ir Ziooecia \ -, r, or, n or „,»., 



^ I (0 = 0.14-0.16 mm. us =0.30-0.36 mm. 



Affinities. — We have not yet discovered an ovicell on any of our specimens. The 

 quadrangular zoaria have much resemblance to Farcimia, but their zooecia are 

 identical with those of the multiserial colonies. 



Occurrence. — Miocene (Choctawhatchee marl) : Jackson Bluff, Ocklocknee 

 River, 25 miles southwest of Tallahassee, Florida (rare). Miocene (Yorktown 

 formation) : 3 miles southwest of Petersburg, Virginia (very rare) . 



Cotypes.—C&t. Nos. 68412, 68413, U.S.N.M. 



Genus CONOPEUM Norman, 1903. 



(For description see Bulletin 106, U. S. National Museum, p. SG.) 



CONOPEUM LACROIXII Busk, 1852. 



Plate 1, fig. 6. 



1919. Conopeum lacroixii Canu and Bassler, Monograph Early Tertiary Bryozoa of North America, 

 Bull. 106, U. S. National Museum, p. 89, pi. 13, fig. 9. (Bibliography, history and dis- 

 tribution.) 



,, . /-> ■ f/(O = 0.40mm. „ . f is = 0.50 mm. 



Measurements. — Upesia \ ^ _ „_ Zooecia { ^ „ „„ 



^ I to = 0.20 mm. [ is = 0.28 mm. 



Although we have had the good fortune to discover the true Memiranipora 

 lacroixii Audouin, 1826 (see p. 22, pi. 29, fig. 4), it is evident that the present species 

 ought henceforth to be classed under Busk's name of 1852. We have no new 

 observations to add to our previous description of this species, for the Miocene 

 specimens are very rare. 



Occurrence. — ^Miocene (St. Mary's formation) : Bowler's wharf, 18 miles above 

 Urbana, Middlesex County, Virginia (rare) . Miocene (Calvert formation) : Reeds, 

 Maryland (rare). Miocene (Bowden marl): Bowden, Jamaica (rare). 



PlesiotT/pe. —C&t. No. 68414, U.S.N.M. 



CONOPEUM OVALE Canu and Bassler, 1919. 



Plate 5, fig. 6. 



1919. Conopeum ovale Canu and Bassler, Geology and Paleontology of the West Indies Bryozoa, 

 Pub. Carnegie Institution of Washington, No. 291, p. 77, pi. 5, fig. 6. 



Description. — The zoarium incrusts shells. The zooecia are distinct, elongated, 

 oval, the point above, separated by a deep furrow; the mural rim is thin, oblique, 

 flat; the opesium is entu-e, oval. There are two orbicular impressions at the base 

 of the zooecia. The Lnteropesial cavities are irregular and rare. 



Mea,urements.-Opes\a I h^^^f^ °^«^- Zooecia I ^'^^-^'^ "^"^■ 



1/0 = 0.15 mm. "'"' '^ [ h = 0.2omm. 



