NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 157 



RHYNCHOZOON(7) LEVIGATUM, new species. 



Plate 45, fig. 11. 

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

 ovoid, separated by a furrow; the frontal is very convex, smooth or very finely gran- 

 ular. The apertura is oval; the peristomice bears interiorly an excentric pseud o- 

 lyrula; the peristome is thick and salient. The ovicell is globular, salient, attached 

 to the peristome; its orifice is large, placed in the peristomie, and can not be closed 

 by the operculum. 



,, ^ A X fAa=0.12mm. „ . fiz =0.50-0.75 mm. 



Measurements. — ^Apertura {^ ^ , „ Zooecia <^^ „ „^ 



^ iM =0.10 mm. U2 =0.25 mm. 



Affinities.^The excentric spinule in the peristome characterizes this species. It 

 differs from Schizoporella argentea Hincks, 1882, in the absence of a large oral avic- 

 ularium. The species differs from Mucronella contorta Busk, 1882, in its nonperfo- 

 rated frontal. It differs from RhyncTiozoon tuberculatum Osburn, 1914, in the 

 absence of scattered tuberosities on the frontal. 



Occurrence. — Pleistocene : Mount Hope, Panama Canal Zone (very rare) . 



Holotype.—C&t. No. 68667, U.S.N.M. 



RHYNCHOZOON VERRUCULATUM Smitt, 1872. 



Plate 3, figs. 11-13. 

 1872. Escharella verruculata Smitt, Floridan Bryozoa, pt. 2, Kongl. Svenska Vetenakapa-AkademienB 



Handlingar, no. 4, p. 50, pi. 8, figs. 170-172. 

 1879. Cellepora verruculata Waters, On the Bryozoa of the Bay of Naples, Annals and Magazine 



of Natural History, ser. 5, vol. 3, p. 193, pi. 14, figs. 1-7. 



1884. Escharoides verruculata Busk, Report on Polyzoa collected by the Challenger, vol. 10, pt. 30 



p. 150. 



1885. Cellepora verruculata Waters, On the use of the a\dcularian mandible, with additional list of 



the Naples fauna. Journal Royal Microscopical Society, ser. 2, vol. 5, pi. 14, fig. 37. 



1902. Cellepora verruculata Oalvet, Bryozoaires marins de la region de Cette, Travaux de I'lnstitut 

 de Zoologie de L'Universitfi de Montpellier, mem. 11, p. 66, pi. 2, figs. 6-9. 



1902. Cellepora verruculata Caivet, Bryozoaires marinades c6tes de Corse, Travaux de I'Institut 

 de Zoologie de L'Universit^ de Montpellier, mem. 12, p. 37. 



1914. Cellepora verruculatum Osbtjrn, Bryozoa of the Tortugaa Islands, Publication Carnegie Insti- 

 tution of Washington, no. 192, p. 214. 



,, ^ , ^ tha= 'i. rr ■ fZs =0.45-0.50 mm. 



Measurements. — Apertura \, „ ,„ Zooecia ^ , „ „„ 



^ I to =0.12 mm. Ii2=0.30nim. 



Variations. ^The marginal zooecia are well oriented ; the central zooecia are not, 

 which has caused the species to be classified incorrectly in Cellepora. The frontal 

 avicularium is transverse, much elongated, with triangular mandible. The peristome 

 is lobed or crowned by from three to six tubercles. One of the two lips of the pseudo- 

 rimule of the peristomice often bears a small avicularium. The irregularity of this 

 species defies all description; the absence of limits between the zooecia appears to be 

 the cause. 



We are not entirely certain that the Mediterranean species is that of Smitt; the 

 measurements taken from Calvet's figures appear larger. 



Occurrence. — Miocene (Bowden marl): Bowden, Jamaica (rare). Pliocene (Ca- 

 loosahatchee marl) : Shell Creek, De Soto County, Florida (rare). Pleistocene: Sim- 

 mons Point, Yonges Island, South Carolina (very rare). 



Habitat. — Mediterranean at Naples, Cette, Corse. Atlantic: Gulf of Mexico 

 and Tortugas Islands (24 meters). Indian Ocean: Heard Island (121 meters). 



Plesiotypes.— Cat. No. 68668, U.S.N.M. 



