ART. 21 CYCLOSTOMATOUS BRYOZOA— CANU AND BASSLER 47 



arranged in quincunx. The zone of growth is rather broad and 

 formed of three or four series of tubes. The ovicell is suborbicular, 

 httle convex, smooth. 



Measurements. — Diameter of orifice, 0.12 mm.; diameter of tubes, 

 0.22 mm.; distance of peristomes, 0.64 mm.; separation of peristomes, 

 0.52-0.60 mm. 



Affinities. — The superb figured specimen measures 5 centimeters in 

 length. Some free broken expansions show the median lamella and 

 consequently the identity with the other species of the genus. 



This species differs from Trigonoecia haimeana De Loriol, 1868, 

 which exhibits also large multilamellar specimens, in the presence of 

 salient threads, in the absence of overlapping wrinkles, and in the 

 very different form of its ovicell. 



Occurrence. — Lower Cretaceous (Valangian) : Sainte-Croix (Vaud^> 

 Switzerland (very rare) . 



Holotype. — Canu collection. 



NEMATIFERA RETICULOIDES, new species 



Plate 4, figs. 8-11 



Description. — The zoarium is free, cylindrical, bifurcated, or reticu- 

 late. The tubes are distinct, flat, separated by a salient thread, 

 forming pseudofacettes when they are short. The peristomes are 

 orbicular, salient, thick, arranged in Peripora, that is to say, in groups 

 of closely arranged transverse rows. The zone of growth is a cone, 

 little elevated. 



Measurements. — Diameter of orifice, 0.10 mm.; diameter of zooe- 

 cium, 0.20-0.24 mm.; distance of peristomes, 0.40-0.64-0.80 mm.; 

 separation of peristomes, 0.64 mm. 



AJfiiiities. — The peristomes are rarely arranged in quincunx and 

 their distance is about 0.64 mm. They are somewhat salient and 

 adjacent when they are arranged in transverse lines; with weather- 

 ing they are no longer orbicular and their form is close to that of the 

 peristomes in the Eleidae, but they never have opercula. The dis- 

 tance between the groups of transverse lines is from 0.80 to 1.00 mm. 



This species differs from Nematifera reticulata D'Orbigny, 1853, in 

 its smaller micrometric dimensions, in the arrangement of the peri- 

 stomes in the Peripora form, and in the cylindrical zoarium. It 

 differs from Nematifera acuta D'Orbigny, 1853, in the oral dimensions 

 and in the cylindrical and not lamellar zoarium. The transverse 

 section shows that the zoarium is sometimes a little compressed. 



Occurrence. — Lower Cretaceous (Valangian): Sainte-Croix (Vaud), 

 Switzerland (rare). 



Cotypes.—C&t. No. 69896, U.S.N.M. 



