58 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



and finely granulated. The opesium is elliptical, elongated; the opesiular indenta- 

 tions are large, rectilinear, oblique, limited by a concave proximal border. The 

 ancestrula is very small. 



-,, . /-> • f/io = 0.12mm. rj ■ fi2 = 0.35mm. 



ilieaswremente.— Upesia , ^ __ Aooecia , „ „_ 



' Uo =0.07 mm. \lz =0.30 mm. 



Affinities. — On our type specimen we have observed neither onychocellaria nor 

 ovicells. This is the smallest species of Floridina known. It differs from FJoridina 

 parvicella in its zooecia separated by a deep furrow and in its smaller opesial di- 

 mensions. 



Occurrence. — ^Miocene (Duplin marl) : Natural Well, 2 miles southwest of 

 Magnolia, Duplin County, North Carolina (rare). 



Holotype.—C&t. No. 68478, U.S.N.M. 



Genus VELUMELLA Canu and Bassler, 1917. 



(For description, see Bulletin 106, U. S. National Museum, p. 213.) 

 VELUMELLA ELONGATA, new species. 



Plate 14, fig. 5. 



Description. — The zoarium incrusts shells. The zooecia are distinct, separated 

 by a firrrow, large, elongated, ogival; the mural rim is thin, rounded, granulated, 

 salient; the cryptocyst is shallow, flat, granulated. The opesium is large, semilimar; 

 the opesiular indentations are of little depth, rounded, almost sjTiunetrical. The 

 onychocellarium is large, elongated, straight, acuminate or elliptical; its opesium 

 is median, elongated, elliptical. 



Measurements.-^^es,^t = ""^ZVol "^^ Zooecialf ^ = ^'^^-^-^^ °™- 



^ IZo =0.20-0.25 mm. (Zs =0.35-0.40 mm. 



Opesium off A?i = 0.35 mm. o h 11 " fioft = 0.55-0.65 mm. 



onychocellariumlZn =0.15mm. ■^ ^^^'^^jZon = 0.35 nmi. 



Affinities. — In its general aspect, the relations of its dimensions and its frontal 

 granulations, this species much resembles Vincularla ahyssicola Hincks, ISSl (not 

 Smitt, 1872), from Singapore or the Philippines. It differs from it simply in the 

 absence of lateral facets to the cryptocyst; that is to say, in the peculiarity charac- 

 terizing Smittipora. The onychocellaria are not fusiform as in Bectonychocella and 

 DiplopJioleos. 



Occurrence. — Miocene (Duplin marl): Natural Well, 2 miles southwest of 

 Magnolia, North Carolina (rare) . 



Eolotype.—CsLt. No. 68479, U.S.N.M. 



Genus MICROPORA Gray, 1848. 

 (For description, see Bulletin 106, U. S. National Museum, p. 234.) 



MICROPORA CORIACEA Esper, 1794. 



1862. Reptescharellina disparilis Gabb and Horn, Monograph Polyzoa Secondary and Tertiary 

 formations of North America, Journal Academy Natural Sciences Philadelphia ser 2 

 vol. 5, p. 147, pi. 20, fig. 29. . ■ . 



1912. Micropora coriacea Barroso, Briozoos de la Estacion de Biologia maritima de Santander, 

 Institute nacional de Ciencias Fisico naturales, p. 21. 



