190 BULLETIN 100, UNITED STATES NATIONAL, MUSEUM. 



Affinities. This species is perfectly characterized by its distal aviciilarium, 

 which is large and very salient. It differs from s,-m />,,,-, II aria, elliptic^ Reuss, 1869. 

 in which the dorsal side is very similar, exactly in the quite different form of the 

 distal avicularium. 



We dedicate this splendid and remarkable species to Dr. T. "Way land Vaughan, 

 under whose auspices the present work has been undertaken. 



Occurrence. Vicksburgian (Eed Bluff clay i : "i miles southwest of Blaclen 

 Springs, Alabama (very rare). 



Holotypt. Cat, No. 64244, U.S.X.M. 



SCRUPOCELLARIA DUBIA, new species. 



Plate 32, fifts. 10-14. 



Dexi-ription. The little fragments which we figure are hardly sufficient for the 

 characterization of a species. The characters of the dorsal are quite distinct, but on 

 the frontal side all of the zooecia observed appear to have undergone total regenera- 

 tion. One of the segments seems to indicate the occurrence of chitinous joints, a 

 condition which is not habitual in Scrupin-illar'ifi. The species necessitates further 

 examination based upon numerous and better preserved specimens. 



Occurrence. Middle Jacksonian : Near Lenuds Ferry, Georgetown County, 

 South Carolina (rare). 



Coti/pes.C-&t: Xo. 63953, U.S.X.M. 



SCRUPOCELLARIA CLAUSA, new species. 



Plate 82, figs. 1-5. 



Description. The zoarium is formed of segments with 12 zooecia arranged 

 alternately. The zooecia are distinct, elliptical, provided with a gymnocyst; the 

 mural rim is very thin, salient. The opesium is elliptical. The distal avicularium 

 is large, transverse, much projecting, without pivot or denticle. Xo frontal avicu- 

 larium. The opesium is covered by a membrane with lateral ribs; apertura semilu- 

 nate, with the proximal border concave. On the dorsal side the zooecia are distinct 

 and convex; the vibraculum is straight and acuminate, and without groove; adjacent 

 to it is a small radicular pore. 



-., . |Ao=0.20-0.20 mm . (Zs= 0.36-0.40 mm. 



Measurements. Opesia , ... Zooecia, 



1/0=0.10 mm. [13=0.20 mm. 



[Aa=0.06 mm. 

 A P erture |7a=0.08-0.00 mm. 



Affinities. This species belongs to the group of <S'. marsupiata Jullien. 18S2, 1 

 a recent species dredged in the great depths of the Atlantic off the northwest coast 

 of Spain and between the Azores and the Bermudas. The French author states that 



1 Dragages clu Trueattlem; BryozoMres ; espfeces <lr::guees dans 1'ocean atlantique en 1881, Bulletin 

 Socit Zoologique de France, vol. 7, pi. 13, figs. 17-20. 



