196 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 



Affinities. — In its general aspect this species is close to Oncousoecia vai'ians 

 Reuss, 1869; it differs from it in its smaller orifice (0.14 mm. and not 0.20-0.28 

 mm.) and in the arrangement of its tubes, which are much less regular. The number 

 of longitudinal series of tubes is from three to four. Very rarely a dorsal apophysis 

 is developed. Although we figure the ovicell we have not been able to place this 

 species in its natural genus because the oeciopore has not been observed. 



The specific name is in honor of Dr. F. C. Clark, of Los Aiigeles, California, 

 who has collected many interesting species for our study. 



Occurrence. — Pleistocene: Santa Barbara (very common), and Dead Mans 

 Island, off San Pedro, California (rare) . 



Cotype.~C&t. No. 68733, U.S.N.M. 



FILISPARSA CLARKI, var. PARVULA, new variety. 



Plate 41, figs. 20-22. * 



Description. — The dimensions are smaller than in the typical form. The 

 number of longitudinal series of tubes is five. 

 Measurements: 



Diameter of the orifice _ 0.14 mm. 



Diameter of the peristome 0.16-0.18 mm. 



Zooecial diameter (on the zoarium) 0.20 (0.24) mm. 



Distance between the peristomes 0.60-0.80 mm. 



Separation of the peristomes 0.64-0.90 mm. 



Variations. — The tubes are visible on the dorsal; their diameter there is 0.04 

 mm. Through fossilization they disappear and the dorsal appears more or less 

 smooth; accidentally the latter may be transversally wrinkled. 

 Occurrence. — Pleistocene: Santa Barbara, California (rare). 

 Co<ype.— Cat. No. 68734, U.S.N.M. 



Family CRISIIDAE Johnston, 1847. 



Genus CRISIA Lamouroux, 1816. 



(For description see Bulletin 106, U. S. National Museum, p. 703.) 



CRISIA SERRATA Gabb and Horn, 1862. 



Plate 42, figs. 1-7. 



1862. Crisia serrata Gabb and Horn, Monograph Polyzoa of the Secondary and Tertiary formations 

 of North America, Journal Academy Natural Sciences Philadelphia, ser. 2, vol. 5, p. 174, 

 pi. 21, fig. 66. 



1910. Crisia pacifica Robertson, Cyclostomatous Bryozoa of the west coast of North America, 

 University of California Publications, Zoology, vol. 6, p. 242, pi. 20, figs. 16, 17. 



Measure ments. — 



Diameter of the peristome. 0.08-0.10 mm. 



Distance between the peristomes 0.36-0.42 mm. 



Zooecial diameter _ 0.12 mm. 



Width of a segment 0.46 mm. 



Diameter of the basis ramae. 0.14-0.20 mm. 



