Measurements. — • 



ART. 22. CYCLOSTOMATOUS BRYOZOA CANU AND BASSLER. 19 



AVe are indebted to Mr. Edwin A. Walford for the figured 

 specimen. 



Occurrence. — Jurassic (Bathonian) : Shipton Gorge, Dorset, Eng- 

 land. 



Plesiotype.—Q^Lt. No. 68912, U.S.N.M. 



TRIGONOECIA TRANSVERSA, new species. 



Plate 4, figs. 1, 2. 



Desci^ption. — The zoarium encrusts shells ; it is orbicular ; the zone 

 of growth is narrow but thick. The tubes are visible, quite convex, 

 very salient, rectilinear, cj^lindrical. The peristomes are orbicular, 

 oblique, thin, very close together but never adjacent. The ovicell is 

 triangular, transverse, convex, decorated with two transverse salient 

 wrinkles; the oeciostome is orbicular, little salient, opening on the 

 same plane as that of the peristomes. 



Diameter of orifice 0. 12 mm. 



Diamter of peristome 0. 16-0. 18 mm. 



Distance between tubes .40- .48 mm. 



Separation of tubes .64- .72 mm. 



Diameter of oeciostome 0.07 mm. 



Diameter of zoarium 6.00 mm. 



Affi'nities. — This beautiful species which has been discovered by 

 Mr. Walford in the English Bathonian has external resemblances 

 to Trigonoecia (Berenicea) verrucosa Milne Edwards, 1838, in which 

 the tubes are equally rectilinear; it differs in its peristomes which 

 are much closer together and in the thickness of the marginal 

 borders. It differs from Berenicea exilis Reuss, 1867, in the regular 

 arrangement of its peristomes and in its smaller micrometric meas- 

 urements. 



The regular and very symmetrical form of the ovicell does not 

 permit of confusion with that of Plagioecia. 



OcGv/rrence. — Jurassic (Bathonian) : Shipton Gorge, Dorset, 

 England. 



Eolotype.—C^t. No. 68913, U.S.N.M. 



CARDIOECIA, new genus. 



The ovicell is triangular, transverse, cordiform, little convex, 

 smooth, symmetrical; the oeciostome is small, salient, median. The 

 tubes are club shaped with triparietal gemmation on a basal lamella. 



Genotype. — Cardioecia (Bidiastopora) neocomiensis D'Orbigny, 

 1853. Lower Cretaceous (Neocomian, Aptian). 



The ovicell is less salient and more expanded than in Trigonoecia. 



