242 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



LUNULARIA? GRANDIPORA, new species. 



Plate 12, figs. 3, 4. 



Description. The zoarium is probably a slightly convex Lunulites. The 

 zooecia are disposed in radial and circular rows ; they are large, elongated, distinct, 

 separated by a furrow, and are without cryptocyst ; the mural rim is thin, complete, 

 nearly level, with the summit sharp. The opesium is irregularly elliptical, very 

 finely crenulated. The ovicell is typically endozooecial, very distinct, somewhat 

 convex and separated from the mural rim. The vibracula are arranged in distinct 

 rows ; they are interzooecial, elliptical, symmetrical, and bear in their distal half 

 two lateral condyles. On the inner side the ribs are convex and bear large tuber- 

 osities. 



Affinities. Lunularia grandipora differs from the other species of the genus 

 Lunularia in certain essential characters which fact makes us doubt its position 

 in the genus ; the large opesium is that of the Membranipores ; the ovicell is not of 

 the ordinary type, but is the typical endozooecial ovicell which we have observed 

 in one group of Membranipores; finally, the vibraculum itself, although symmetri- 

 cal, is elliptical and not lozenge-shaped and fusiform. We are probably dealing 

 with an especial genus which must be classified near Vibracellina from which it 

 differs in its orbicular zoarium and its symmetrical nonauriculated vibracula. 



Only three fragments of this interesting species have been collected, which is 

 far too few upon which to base a new genus. 



Occurrence. Claibornian (Lisbon formation) : Wautubbee Hill. 4 miles south 

 of Enterprise, Clarke County. Mississippi (rare). 



Holotype.Cat. No. 63840, U.S.N.M. 



LUNULARIA VERRUCOSA, new species. 



Plate 37, figs. 6-9. 



Description. The zoarium is a convex Lunulites bearing at the center a large 

 number of closed hydrostatic zooecia quite verrucose. The polypidiaii zooecia are 

 distinct, separated by a furrow, rectangular, transverse; the mural rim is little 

 distinct from the cryptocyst and is somewhat projecting; the cryptocyst is much 

 larger than the opesium, shallow, flat, and smooth; the opesium is elliptical and 

 transverse with a proximal border sometimes convex. Its vibracula are arranged 

 in special rows ; they are small, lozenge-shaped, and without lateral condyles. On 

 the inner side the ribs are flat, radial, and a little granulated on certain zoaria. 



. 1 7(0=0.10 mm. . rZ0=0.24mm. 



Measurements. OpesiaJ, iA>7 Zooecia \ , nc . K 



[70=0.07 mm. \ 7.3=0.25-0.30 mm. 



Vibracula! , 



1 fa =0.07 mm. 



Affinities. This species also belongs to the group of Lunularia racliata Lamarck 

 from which it differs in its very small zooecial dimensions. 



It differs from Lunularia ovata because its opesium is transverse and not oval, 

 and by the sides of the inner face, which are flat and almost smooth. 



