164 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



RAMPHONOTUS LEVIS. new species. 



I'hite 1. tit;. 14. 



Dexri'i/i/iiiii. The zoarium incrusts shells. The zooecia are distinct, elongated, 

 pyriform. with a convex gynmocyst : the mural rim is thin, salient, a little enlarged 

 at the base. The opesium is oval, anterior, entire. The median avicularium is 

 small and projects very little. 



. \ko=OM mm. - \Lz = 0.35-0.40 mm. 



Measur, ments.-Op^^^^ mm ia |7 s =o.24 mm. 



Afiinitirx. Calcified zooecia perforated l>y a large, round pore and ornamented 

 with a distal cresc-ent may be observed. There are also imperforated calcined 

 zooecia. 



This species differs from RamphonofH* laccatiis in its smooth mural rim, and 

 from Roinjihonot'iK ft'//i//<n-!x in its small dimensions. 



Occurn nee. Lowest Eocene (Bryozoan bed at base of Aquia formation) : Up- 

 per Marlboro. Maryland (very rare). 



Holotyp?. Cat. No. 63776. U.S.X.M. 



RAMPHONOTUS SLOANI. new species. 



Plate 4. fiir. 4. 



Def-i'/i>f'">n. The zoarium incnists shells. The zooecia are little distinct, 

 joined laterally to one another: elongated, elliptical; the mural rim is wide, flat, 

 very oblique, finely granulated. The opesium is elliptical, elongated, quite finely 

 crenulated. The ovicell is hyperstomial, never closed by the o'percular valve, globu- 

 lar, very salient : it is ornamented in front by a triangular cicatrix. The avicu- 

 larium is large, transverse, elliptical, with pivot, salient. 



. (A0=0.30-0.3r> mm. . \Ls=0.50 mm. 



Measurements. Upesia , Zooecia, Aon Ao- 



1/0=0.20 mm. lfe=0.30-0.3o mm. 



Variations. The ovicell takes the place of the large distal avicularia, accord- 

 ing to the rule in the genus. The latter is replaced by two small avicularia with 

 pivot placed in the interzooecial angles. 



A-ffinit'ns. This is the largest species of Ramphonotus found in our American 

 formations. The micrometric dimensions and the size of its avicularium differen- 

 tiate it clearly from the other species. 



We dedicate this fine new species to Mr. Earle Sloan, of Charleston. South 

 Carolina, who has been of great assistance to us in securing specimens from varioii> 

 localities in his State. 



The only specimen found has been figured. 



Occum i'' . Midwityan (Clayton lime-tone) rBrundidge. Alabama (very rare). 

 C&t. No." 63798, U.S.X.M. 



