188 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



SCRUPOCELLARIA WILLIARDI. new species. 



Plate 81. figs. 24-27. 



Description. The segments in this species are thick and bear at least 10 

 zooecia arranged alternately. The zooecia are not distinctly separated from each 

 other, are pyriform and provided with a small proximal cryptocyst; their mural 

 rim is rounded and with neither spines nor scutum: the distal avicularium is very 

 small and inconstant. On the dorsal the zooecia are indistinct; here the vibraculum 

 is quite large and bears a broad groove adjacent to which is a radicular pore, pro- 

 jecting but little. 



. [^0=0.26 mm. . (7,3=0.40 mm. 



Measurements. Opesia , Zooecia , 



1/0=0.12 mm. 173=0.28 mm. 



Affinities. In its pyriform opesium this species is quite similar to the living 

 S. rctifor-mis Smitt, 1872, but it differs totally on account of its very large vibracu- 

 lum, which above all is quite characteristic. 



The specific name is in honor of our friend. Mr. Thomas E. Williard, of the 

 United States Geological Survey, to whom we are indebted for many courtesies. 



Occurrence. Vicksburgian (Marianna limestone) : Salt Mountain. 5 miles 

 south of Jackson, Alabama (common). 



Vicksburgian (Byram marl) : Near Woodward, Wayne County, Mississippi 

 (rare). 



C-At. No. 6424:5, U.S.N.M. 



SCRUPOCELLARIA TRIANGULATA, new species. 



I'hite 81. fi.ss. 17-19. 



Description. The segments are narrow, triimi/tilor in cross section, and bear 

 12 to 14 zooecia arranged alternately. The zooecia are distinctly elliptical and are 

 provided with a small proximal cryptocyst : the opesium is pyriform and narrowest 

 anteriorly; the mural rim is rounded and bears trace of a scutum; the distal avicu- 

 larium is simple and very small, while the frontal avicularium is quite rare. On 

 the dorsal the zooecia are distinct and a little convex: the vibraculum is large. 

 slightly oblique, acuminate, and provided with a long, very oblique groove; the 

 radicular pore is prominent. 



. [/i=0.20 mm. . [7,3=0.36 mm. 



aeasun nn nts. Opesia , Zooecia , 



1/0 = 0.10 mm. |/*=0.28 mm. 



Affinities. This species is closely related tu Scrupocellaria reficulata Smitt. 

 1872. occurring in the waters off Florida. X. ti-iinnjuJata is distinguished, however. 

 by its smaller dimensions, by the absence of the frontal avicularium and by its non- 

 crenulated opesium. 



Occurrence. Yicksburgian (Glendon member of Marianna limestone) : West 

 bank of Couecuh River, 1 mile below mouth of Sepulga River. Escambia County, 

 Alabama (rare). 



u i><<. Cat. No. 64241, U.S.N.M. 



