NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 59 



1917. Micropora coriacea Canu, Bryozoaires foseiles des Terrains du Sud-Ouest de la France, Bulle- 

 tin de la Soci^t6 G^ologique de France, ser. 4, vol. 16, p. 135 (cites bibliography). 



1920. Micropora coriacea Canu and Bassler, Monograph Early Tertiary Bryozoa of North 

 America, Bulletin 106, U. S. National Museum, p. 235, pi. 4, figs. 20-22. 



The only known occurrence in American post Oligocene strata of this well- 

 known recent and fossil hrj- ozoan is in the Pleistocene rocks of California, where it 

 received the name of Reptescharellina disparilis Gabb and Horn, 1862. The species 

 is discussed on page 235 of our volume on the North American Early Tertiary 

 Bryozoa, where a more complete bibliography is given. 



Occurrence. — Midwayan, Jacksonian, and Vicksburgian of the United States 

 Pleistocene: Santa Barbara, California (rare). 



Plesiotype.— Cat. No. 68480, U.S.N.M. 



Genus SELENARIA Busk, 1854. 



1854. Selenaria Busk, Catalogue marine Polyzoa, pt. 2, p. 101. 



The ovicell is endozooecial; it appears on the surface of the colony as low, 

 rounded, pent-roof shaped swellings. The cr^-ptocyst is perforated by the opesiules 

 or limited by the opesiular indentations. The opesium is irregular. The opercular 

 valve is limited by the distal part of the zooecial mural rim. Porous vibracula are 

 disseminated among the zooecia. The zoarium is discoid and cupuliform; its inner 

 surface is perforated by numerous pores. No spines. 



Genotype. — Selenaria maculata Busk, 1854. 



Range. — Claibornian to Kecent. 



According to Levinsen, who wrote in 1909: 

 The -s-ibracula are an arched frontal surface perforated by numerous pores or by slits, A high ribbou- 

 shaped lamina issuing from the one lateral margin in the distal part of the A^bracularian chamlier stretches 

 over toward the opposite margin and not far from this bends inward toward the basal surface. It 

 serves no doubt for the attachment of the flagellum. Distal wall with two multiporous septules, and the 

 distal half of each lateral wall with a single one. Lateral walls are common to the contiguous neigh- 

 boring zooecia. 



SELENARIA AURICULARIA, new species. 



Description. — The zoarium is a Lunulltes form of 6 mm. in diameter. The 

 zooecia are distinct, separated by a sahent and wide mm-al rim, hexagonal, regular 

 or transverse; the cryptocyst is deep, flat, smooth, and perforated by two large equal 

 opesiules symmctricalh' arranged. The apertura is elliptical and transverse. The 

 vibracula are very large, auriform, terminated by a short, hooked, small canal. 

 The inner side is perforated by numerous pores regularly arranged on the inner layer 

 and very irregularly disposed on the outer central layer. 



Variations. — The zooecia are very irregular in size and we have not been able 

 to discover any constant micrometric measurements. The apertura is likewise 

 irregular in its measurements. The vibracula arc larger at the periphery than at the 

 center. The opesiules alone are of the same diameter on all the zooecia. 



Affinities.— The form of the opesiules is quite variable in the genus Selenaria. 

 They are perforated (as in our American species) in S. parvipunctata Maplestone, 

 1904: S. bimorphocella Maplestone, 1904; and iS'. magnipunctata Maplestone, 1904. 

 They are formed b}- deep lateral indentations in S. maculata Busk, 1862. They 



