110 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.72 



Occurrence. — Albatross Station D. 2639, Straits of Florida; 25° 04' 

 50" N.; 80° 15' 10" W.; 56 fms.; coral sand. 

 Holotype.—Csit. No. 7537, U.S.N.M. 



LEPRALIA FISSURAT A, new species. 



Plate 33, Figure 1 



Description. — The zoarium encrusts shells. The zooecia are dis- 

 tinct, separated by a furrow, elongated, elliptical; the frontal is 

 convex, perforated by large tremopores scattered and separated by 

 large salient granulations. The aperture is elliptical, very little 

 elongated; two small cardelles separate a large anter from a much 

 smaller poster; the peristome is thin, nonsalient. The ovicell is 

 large, globular, smooth, buried on the distal zooecium, hyperstomial; 

 it bears a long longitudinal j^ssitre, very irregular in width. One or 

 two small avicularia are arranged in the vicinity of the poster. 



,, s A ,. \Jia = 0.15 mm. 



Measurements. — Apertureu 



^ Ua = 0.12 mm. 



ry . 1X^ = 0.40-0.47 mm. 



2^^^^^3 = 0.35-0.40 mm. 



Affinities. — At first sight this species appears to be a Lepraliella 

 but it differs however in its nondeltoid ovicellarian fissure and often 

 formed by two simple pores united by a fissure. This structure is 

 very remarkable and it is very difficult to interpret it on the fossils. 



The ovicell appears to be independent of the cell into which it does 

 not open. Moreover, it is deprived of the usual transverse sht by 

 which the larvae can escape. We can then only admit that the 

 longitudinal fissure serves for this latter function. But this is only 

 a supposition and the examination of recent specimens only can 

 confirm it. We leave the species then in the old genus Lepralia, 

 awaiting better observations. 



Occurrence. — PHocene : Minnitimmi Creek, Bocas Island, Almirante 

 Bay, Northwest Panama. 



Holotype.— Cat. No. 70846, U.S.N.M. 



Subfamily Microporellae Canu and Bassler, 1917 



Genus MICROFORELLA Hincks, 1877 



MICROPORELLA CILIATA Linnaeus, 1759 



Text Figure 20a 



1914. Microporella ciliata Osburn, Bryozoa of the Tortugas Islands. Publi- 

 cation Carnegie Institution, Washington, No. 182, p. 208. (Re- 

 gional bibliography.) 



1923. Microporella ciliata Canu and Bassler, North American Later 

 Tertiary and Quaternary Bryozoa. Bull. 125, U. S. National 

 Museum, p. 119, pi. 20, figs. 1-6, pi. 36, figs. 4, 5. (Recent bibli- 

 ography and geologic distribution.) 



