NORTH AMKR1CAN KAKLY TERTIARY BRTOZOA. 189 



SCRUPOCELLARIA RATHBUNI, new species. 



l'l:iti- M. lii-'s. 30-32. 



Description. The segments are i. arrow and bear 10 alternating zooecia; their 

 transverse section is triangular. The xooecia are distinct, oblique, slightly pyrit'orm, 

 and are without a cryptocyst: the opesiuni is pyriform and narrowest proximally ; 

 the mural rim is thin, rounded, and bears a short, hollow, projecting spine, -which 

 represents the scutum: thi> distal avictilarium is simple and very small, but the 

 frontal avicularium is very large and projecting, slightly oblique, with the point 

 above and without pivot, but with two lateral denticles. On the dorsal, the 

 zooecia are visible and convex: the avicularium is very oblique and terminates in 

 a long spatulate groove: adjacent to it is a small projecting radicular pore. 



. [7(.o=0.28 mm. 

 Measurements. Opesia , . , 



[Zo=0.10 mm. 



. (.3=0.44-0.48 mm. 



/ooecia , . . . . , 



lfe=0/24 mm. ( .Not counting projection or avicularium.) 



A-fiiHi+ii'x. This species is excellently characterized by the large size and pro- 

 jection of its frontal avicularia, which give to the zoarium a very bristling aspect. 

 Otherwise the species is very close to the living S. rct/formi* Smitt. 1872. It is 

 remarkable to observe the occurrence of species of this type throughout the ages in 

 the same waters of Florida. 



The specific name of this very characteristic species is in honor of Dr. Richard 

 Rathbun, late assistant secretary of the Smithsonian Institution, in charge of the 

 United States National Museum, in appreciation of his work upon marine inverte- 

 brates. 



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

 bank of Conecuh River. 1 mile below the month of Sepulga River. Escambia 

 County. Alabama (rare). 



H<>lotype.Q?A. No. 6424.-), U.S.N.M. 



SCRUPOCELLARIA VAUGHANI. new species. 



Plate SI. figs. 28, 29. 



Description. The segments are compressed and bear 10 alternating zooecia. 

 The zooecia are distinct, oblique, elliptical, without cryptocyst, but with a small 

 gymnocyst. The opesium is elliptical ; the mural rim, thin and rounded, has a 

 short, hollow, spine which is the trace of the articulation of the scutum. The 

 frontal avicularium is small, little salient, triangular; the distal avicularium is 

 large, triangular, without pivot and with a very sharp beak. On the dorsal side 

 the zooecia are indistinct: the vihraculiim is very large and triangular, whereas the 

 radicular pore is very small. 



,, . [7(0=0.25 mm. . f.2 = 0.4.'> mm 



Mi asurem* ntn. Opesia Zooecia \, 



Zo=0.12 mm. 7= =0/22 mm. 



