240 PROCEEDINGS OF THE NATIONAL MUSEUM voi,. iob 



level of the zooecial front and are marked with faint lines. Lateral 

 sides of the zooecial orifice straight and nearly parallel. The species 

 is named mostly for this conspicuous flaring of the walls, although 

 that feature is present to some extent in a few other species. 



Colony: There are only nine small ivory-colored scraps, none 

 continuous and none more than 12.5 mm. long, so a complete colony 

 was not available for study. The pieces are slender, rod-shaped, 

 0.696 to 1.253 mm. (average 1.032 mm.) in diameter. The areolation 

 is rhombic to hexagonal and evident even to the naked eye. The 

 surface of the colony is marked like a fine file by the raised zooecial 

 walls. 



Zooecia: The external visible frontal surface of the zooecia meas- 

 ures 0.648 to 0.835 mm. (average 0.747 mm.) in length and 0.403 to 

 0.576 mm. (average 0.504 mm.) in width. The zooecia are rhombic 

 to hexagonal and shaped somewhat lUve an angular pan; the frontal 

 cryptocyst is depressed except for a slightly salient orifice, the ovicell , 

 walls, and the zooecial walls. The zooecial walls flare conspicuously 

 and somewhat obliquely outward, framing the frontal area. The 

 mural rims of neighboring zoids meet and fuse in a raised knife-edge. 

 Faint transverse lines or creases give the mural rims a delicately 

 crinkled appearance. These creases appear to be due partly to small 

 irregularities in the thickness of calcification and also sometimes to a 

 few small, very low tubercles lined up transversely. The mural rims 

 are crumbly, jagged or uneven. The zooecial wall is quite opaque. 

 Some of the specimens were a bit difiicult to study because of fine 

 chalky accumulations on their surface, as if covered lightly by debris. 

 Also, some of the sprigs appear a bit eroded as if some chemical had 

 affected the calcareous surface. 



Zooecial orifice: The dimensions of the zooecial orifice are: 

 length from 0.101 to 0.130 mm. (average 0.120 mm.); width 0.158 to 

 0.187 mm. (average 0.173 mm.). The zooecial orifice is raised sharply 

 from the frontal. Its distal border is straight. The lateral walls are 

 straight and nearly parallel. The proximal border is concave because 

 of the convex curvature of the lower lip. Two prominent condyles 

 project into the orifice near the proximal corners. Opposite them, 

 from a ledge located inside the distal rim of the orifice, are two distal 

 triangular or broadly pointed teeth. These arise from a prolongation 

 of the two corners of the calcareous ledge. The ledge does not reach 

 the lateral walls. The proximal teeth also are borne on a ledge which 

 is part of the lower lip. No opercula were seen. 



OviCELLs: All the ovicells seen are imperfect, as if the front had 

 been broken away at least in part, leaving only the ovicell cavity. 

 This cavity measures 0.173 to 0.202 mm. (average 0.180 mm.) in 



