EARLY TERTIARY CHEILOSTOME BEYOZOA. 29 



lamellae. The zooecia are somewhat elongated, confluent among 



themselves, vaguely polygonal; the mural rim is broad, especially 



below, flat, smooth, oblique. The cryptocyst is terminated distally 



in a small polypidian convexity. The avicularia are straight, small, 



interopesial, triangular, projecting chiefly at the point. 



iho=0.10 mm. 

 Measurements. — Opesia of large zoceciaw^_Q -j^^ ^^^ 



^ ■ £ 11 ■ (ho=0.18 mm. 



Opesia or small zooecia , . ^ ^ 

 ^ [lo=0.10 mm. 



-r . (Ls—OAO mm. 



Large zooecia , ^ on a ^n 



^ |?s= 0.30-0.40 mm. 



on . [Ls =0.4:0 mm. 



femall zooecia 7 _ „„ 



|/s=0.30 mm. 



Occurrence. — Middle Jacksonian: Wilmington, North Carolina; 



also at numerous localities in South Carolina and 



Georgia. 

 Upper Jacksonian : Georgia, Alabama, Florida, and 



Mississippi. 

 Type.— Cait. No. 62584, U.S.N.M. 



AECHMELLA, new genus. 



(Aichme, head of a lance, referring to the form of the avicularia.) 



The polypidian convexity is little prominent. The opesiules are 

 round, lateral indentations. The opesium is often contracted by two 

 lateral teeth at the level of the opercular hinge. The ovicell is endo- 

 zooecial. The avicularium is interzooecial, smaller than a zocecium, 

 losange shaped, with the form of the head of a lance. 



Genot7jpe. — Aechmella filimargo, new species. 



Range. — Cenomanian-Miocene. 



AECHMELLA FILIMARGO, new species. 



Plate 3, fig. 5. 



The zoarium incrusts Orbitoides. The zooecia are elongated, dis- 

 tinct, separated by a furroAV or united by their mural rims; the mural 

 rim is thin, incomplete, convex, distinct from the cryptocyst. The 

 cryptocyst is shallow, oblique towards the opesium, flat, finely granu- 

 lose; the opesium is transverse, constricted by two lateral teeth at 

 the level of the rotary axis of the operculum. The polypidian con- 

 vexity [>roiects but little ; the opesiular indentations are large, round, 

 and symmetrical. The ovicell is endozooecial and small. The an- 

 cestrula is a small zooecium, but otherwise identical with the others. 



