168 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



The specific name is in honor of Mr. John M. Xickles, of the United States 

 Geological Survey, whose work upon American Paleozoic bryozoa is well known. 

 Occurrence. Middle Jacksonian: Eutaw Springs, South Carolina (very rare). 

 Cotypes.Csit No. 63035, U.S.N.M. . 



Genus STAMENOCELLA Canu and Bassler, 1917. 



I'.HT. Stantcnoeclln CA.XTJ and BASSLEH, S.Mmpsis of American Early Tertiary Clieilostome 

 Bryozoa, Bulletin 96, United States National Museum, p. 21. 



Ovicell hyperstomial not closed by the opercular valve. No dietellae. frym- 

 nocyst long and flat, supporting a small sessile, salient avicularium. 



Genotype. Stamenocella mediaviculifera Canu and Bassler, 1017. 



Range. Senonian-Vicksbnrgian. 



The genus which is nearest to this type of structure is Bfirtnllfti-ift Marsson, 

 1887, in which the zooecia are identical. but are disposed on a single side of a 

 triserial zoarium. The two genera undoubtedly belong to the same family. 



The genus Bugidaria Levinsen. 1909, the type of which is the recent Carbasea 

 r/txfttmitis Busk, 1896, appears very similar. Nevertheless its zooecia are disposed 

 on only one side of the zoarium, the basal edge of its distal wall is angular and the 

 ovicell is free. Levinsen has classed his genus Bwr/nlaria in the Biffllnriiflac, but 

 his family is not an entirely natural one, as it contains three genera. Biif/irfti. 

 Encniti n, and Bifdlnri/i, which have absolutely distinct larvae. It also contains 

 Chaperia, in which the anatomical characters are quite different from Bur/ida. 



In >^fiiini'/ii'i i /In the gymnocyst supports the ovicell which is extremely fragile,' 

 and also the avicularium. The ovicell of the proximal zooecia forces the avicu- 

 larium of the distal zooecia near to their opesia. 



There may be classed in this genus 



stiiinriioi'i'llii. (/> iff i/xf fir) fenestrelln D'Orbigny. ls5i>. 



Stamenocella (Flustrella) convened D'Orbigny, IS:>L'. 



Stamenocella (Esckara) cuvieri Yon Hagenow, 1851. 



The genus also probably includes the Cretaceous group of Rhi/n<--lu>t, ll,i Canu. 

 which, however, presents some divergent characters. The name Rhsynchotella can 

 not be admitted in nomenclature because it was proposed by Canu as a simple 

 artificial grouping to facilitate the determination of species. 



STAMENOCELLA CYLINDRICA, new species. 



Plate 1, fig. 15. 



Di'srrifition. The zoarium is free, ci/I'mil r'n;il. formed of longitudinal rows 

 of zooecia. The zooecia are long, distinct, a little narrowed behind: the mural rim 

 is salient, wide, convex, smooth ; the gymnocyst is flat, as long as half of the zooecium 

 and bears 2 to 4 proximal punctations. The opesium is elliptical or oval. 



A0=0.22-0.25 mm. 



Mi asurements. Opesia , Zooecia 



{lo=O.W mm. 



Ls= 0.70-0. 72 mm. 

 fe=0.25 mm. 



Affinities. Only the figured specimen has been found, which permits no serious 

 study. It contains n calcified zooecium. It is possible, indeed, that the zoarium 



